commit 2600340c03023498d048e9824161fdafe53771c8
Author: Gyubin Han <89185979+Gyubin-Han@users.noreply.github.com>
Date:   Tue Apr 30 16:59:10 2024 +0900

    first commit
    
    from old repository to a new repository

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4422858
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.temp
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4541b11
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+# PPS
diff --git a/boj/1003.py b/boj/1003.py
new file mode 100644
index 0000000..0093315
--- /dev/null
+++ b/boj/1003.py
@@ -0,0 +1,12 @@
+from sys import stdin
+t=int(stdin.readline().rstrip())
+
+for _ in range(t):
+    fibo=[0,1]
+    z=[1,0]
+    
+    n=int(stdin.readline().rstrip())
+    for i in range(2,n+1):
+        fibo.append(fibo[i-1]+fibo[i-2])
+        z.append(z[i-1]+z[i-2])
+    print(z[n],fibo[n])
\ No newline at end of file
diff --git a/boj/1032.py b/boj/1032.py
new file mode 100644
index 0000000..49f9449
--- /dev/null
+++ b/boj/1032.py
@@ -0,0 +1,18 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+pattern=""
+plen=0
+
+for _ in range(n):
+    name=stdin.readline().rstrip()
+    if plen==0:
+        pattern=name
+        plen=len(pattern)
+    else:
+        for i in range(plen):
+            if pattern[i]=='?' or pattern[i]==name[i]:
+                continue
+            else:
+                pattern=pattern[:i]+'?'+pattern[i+1:]
+
+print(pattern)
\ No newline at end of file
diff --git a/boj/10807.py b/boj/10807.py
new file mode 100644
index 0000000..d3dd717
--- /dev/null
+++ b/boj/10807.py
@@ -0,0 +1,5 @@
+n=int(input())
+arr=list(map(int,input().split()))
+s=int(input())
+
+print(arr.count(s))
\ No newline at end of file
diff --git a/boj/10814.py b/boj/10814.py
new file mode 100644
index 0000000..a60e816
--- /dev/null
+++ b/boj/10814.py
@@ -0,0 +1,12 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+arr=[]
+
+for _ in range(n):
+    age,name=map(str,stdin.readline().rstrip().split())
+    arr.append([int(age),name])
+
+arr.sort(key=lambda x:x[0])
+
+for r in arr:
+    print(r[0],r[1])
diff --git a/boj/10815.py b/boj/10815.py
new file mode 100644
index 0000000..1b14e20
--- /dev/null
+++ b/boj/10815.py
@@ -0,0 +1,12 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+narr=set(map(int,stdin.readline().rstrip().split()))
+
+m=int(stdin.readline().rstrip())
+marr=list(map(int,stdin.readline().rstrip().split()))
+
+for i in range(m):
+    if marr[i] in narr:
+        print(1,end=" ")
+    else:
+        print(0,end=" ")
\ No newline at end of file
diff --git a/boj/10816.py b/boj/10816.py
new file mode 100644
index 0000000..ab77ae1
--- /dev/null
+++ b/boj/10816.py
@@ -0,0 +1,22 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+narr=list(map(int,stdin.readline().rstrip().split()))
+cnt=dict()
+for i in narr:
+    if not i in cnt:
+        cnt[i]=1
+    else:
+        cnt[i]+=1
+
+# print(cnt.keys())
+# k=cnt.keys()
+# for i in k:
+#     print(cnt[i])
+
+m=int(stdin.readline().rstrip())
+marr=list(map(int,stdin.readline().rstrip().split()))
+for i in marr:
+    if i in cnt:
+        print(cnt[i],end=" ")
+    else:
+        print(0,end=" ")
\ No newline at end of file
diff --git a/boj/10818.py b/boj/10818.py
new file mode 100644
index 0000000..08c684a
--- /dev/null
+++ b/boj/10818.py
@@ -0,0 +1,7 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+arr=list(map(int,stdin.readline().rstrip().split()))
+
+# 정렬을 한번 하고나서 맨 처음과 끝을 출력하여 최대, 최소값을 출력
+arr.sort()
+print(arr[0],arr[-1])
\ No newline at end of file
diff --git a/boj/10828.py b/boj/10828.py
new file mode 100644
index 0000000..baa1890
--- /dev/null
+++ b/boj/10828.py
@@ -0,0 +1,27 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+stack=[]
+
+for _ in range(n):
+    s=stdin.readline().rstrip().split()
+
+    if len(s)==1:
+        if s[0]=='pop':
+            if len(stack)==0:
+                print(-1)
+            else:
+                print(stack.pop())
+        elif s[0]=='top':
+            if len(stack)==0:
+                print(-1)
+            else:
+                print(stack[-1])
+        elif s[0]=='size':
+            print(len(stack))
+        else:
+            if len(stack)==0:
+                print(1)
+            else:
+                print(0)
+    else:
+        stack.append(int(s[1]))
\ No newline at end of file
diff --git a/boj/10845.py b/boj/10845.py
new file mode 100644
index 0000000..834cb01
--- /dev/null
+++ b/boj/10845.py
@@ -0,0 +1,32 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+q=[]
+
+for _ in range(n):
+    s=stdin.readline().rstrip().split()
+
+    if len(s)==1:
+        if s[0]=='pop':
+            if len(q)==0:
+                print(-1)
+            else:
+                print(q.pop(0))
+        elif s[0]=='front':
+            if len(q)==0:
+                print(-1)
+            else:
+                print(q[0])
+        elif s[0]=='back':
+            if len(q)==0:
+                print(-1)
+            else:
+                print(q[-1])
+        elif s[0]=='size':
+            print(len(q))
+        else:
+            if len(q)==0:
+                print(1)
+            else:
+                print(0)
+    else:
+        q.append(int(s[1]))
\ No newline at end of file
diff --git a/boj/10866.py b/boj/10866.py
new file mode 100644
index 0000000..5106b8e
--- /dev/null
+++ b/boj/10866.py
@@ -0,0 +1,42 @@
+from sys import stdin
+from collections import deque
+n=int(stdin.readline().rstrip())
+dq=deque()
+
+for _ in range(n):
+    s=stdin.readline().rstrip().split()
+
+    if len(s)==1:
+        if s[0]=='pop_front':
+            if len(dq)==0:
+                print(-1)
+            else:
+                print(dq.popleft())
+        elif s[0]=='pop_back':
+            if len(dq)==0:
+                print(-1)
+            else:
+                print(dq.pop())
+        elif s[0]=='front':
+            if len(dq)==0:
+                print(-1)
+            else:
+                print(dq[0])
+        elif s[0]=='back':
+            if len(dq)==0:
+                print(-1)
+            else:
+                print(dq[-1])
+        elif s[0]=='size':
+            print(len(dq))
+        else:
+            if len(dq)==0:
+                print(1)
+            else:
+                print(0)
+    else:
+        if s[0]=='push_front':
+            dq.appendleft(int(s[1]))
+        else:
+            dq.append(int(s[1]))
+            
\ No newline at end of file
diff --git a/boj/10950.py b/boj/10950.py
new file mode 100644
index 0000000..0b328ed
--- /dev/null
+++ b/boj/10950.py
@@ -0,0 +1,5 @@
+n=int(input())
+
+for _ in range(n):
+    a,b=map(int,input().split())
+    print(a+b)
\ No newline at end of file
diff --git a/boj/10951.py b/boj/10951.py
new file mode 100644
index 0000000..686dc80
--- /dev/null
+++ b/boj/10951.py
@@ -0,0 +1,10 @@
+# 별도의 입력 갯수를 정하지 않고 계속 입력받기 위해 while문 사용
+while True:
+    # EOF를 통해서 프로그램이 종료되는 구조임.
+    try:
+        a,b=map(int,input().split())
+        print(a+b)
+    # EOF가 발생한 경우, EOFError라는 예외가 발생하여, 이 예외를 처리
+    except EOFError:
+        # 상위에서 동작하는 반복문을 중지하고, 반복문을 빠져 나옴.
+        break
\ No newline at end of file
diff --git a/boj/10952.py b/boj/10952.py
new file mode 100644
index 0000000..2bf4f5d
--- /dev/null
+++ b/boj/10952.py
@@ -0,0 +1,6 @@
+while True:
+    a,b=map(int,input().split())
+
+    if a==b==0:
+        break
+    print(a+b)
\ No newline at end of file
diff --git a/boj/11021.py b/boj/11021.py
new file mode 100644
index 0000000..358a0f7
--- /dev/null
+++ b/boj/11021.py
@@ -0,0 +1,5 @@
+n=int(input())
+
+for i in range(n):
+    a,b=map(int,input().split())
+    print("Case #"+str(i+1)+":",a+b)
diff --git a/boj/11022.py b/boj/11022.py
new file mode 100644
index 0000000..8f09bef
--- /dev/null
+++ b/boj/11022.py
@@ -0,0 +1,5 @@
+n=int(input())
+
+for i in range(n):
+    a,b=map(int,input().split())
+    print("Case #"+str(i+1)+":",a,"+",b,"=",a+b)
\ No newline at end of file
diff --git a/boj/11047.py b/boj/11047.py
new file mode 100644
index 0000000..2db5d23
--- /dev/null
+++ b/boj/11047.py
@@ -0,0 +1,14 @@
+n,k=map(int,input().split())
+oarr=[]
+for i in range(n):
+    oarr.append(int(input()))
+
+oarr.reverse()
+
+count=0
+for i in oarr:
+    d=int(k/i)
+    k-=(i*d)
+    count+=d
+
+print(count)
diff --git a/boj/11279.py b/boj/11279.py
new file mode 100644
index 0000000..cae0e95
--- /dev/null
+++ b/boj/11279.py
@@ -0,0 +1,15 @@
+from sys import stdin
+from queue import PriorityQueue
+n=int(stdin.readline().rstrip())
+q=PriorityQueue()
+
+for _ in range(n):
+    i=int(stdin.readline().rstrip())
+
+    if i==0:
+        if q.qsize():
+            print(q.get()*(-1))
+        else:
+            print("0")
+    else:
+        q.put(-i)
diff --git a/boj/11286.py b/boj/11286.py
new file mode 100644
index 0000000..6b7dc94
--- /dev/null
+++ b/boj/11286.py
@@ -0,0 +1,16 @@
+from sys import stdin
+from queue import PriorityQueue
+n=int(stdin.readline().rstrip())
+pq=PriorityQueue()
+
+for i in range(n):
+    inp=int(stdin.readline().rstrip())
+
+    if inp==0:
+        if pq.qsize()==0:
+            print(0)
+        else:
+            print(pq.get()[1])
+    else:
+        v=(abs(inp),inp)
+        pq.put(v)
\ No newline at end of file
diff --git a/boj/11399.py b/boj/11399.py
new file mode 100644
index 0000000..0e4da54
--- /dev/null
+++ b/boj/11399.py
@@ -0,0 +1,13 @@
+n=int(input())
+arr=list(map(int,input().split()))
+min=list()
+
+arr.sort()
+min.append(arr[0])
+sum=arr[0]
+
+for i in range(1,n):
+    min.append(min[i-1]+arr[i])
+    sum+=min[i]
+
+print(sum)
\ No newline at end of file
diff --git a/boj/11501.py b/boj/11501.py
new file mode 100644
index 0000000..c15c7b2
--- /dev/null
+++ b/boj/11501.py
@@ -0,0 +1,18 @@
+import sys
+input=sys.stdin.readline
+t=int(input().rstrip())
+
+for _ in range(t):
+	d=int(input().rstrip())
+	arr=list(map(int,input().rstrip().split()))
+
+	mx=0
+	s=0
+	for i in range(d):
+		a=arr.pop()
+		
+		if mx<a:
+			mx=a
+		else:
+			s+=(mx-a)
+	print(s)
\ No newline at end of file
diff --git a/boj/1157.py b/boj/1157.py
new file mode 100644
index 0000000..b39f3a3
--- /dev/null
+++ b/boj/1157.py
@@ -0,0 +1,28 @@
+import sys
+s=sys.stdin.readline().rstrip().upper()
+cnt=dict()
+
+for i in range(len(s)):
+    if not s[i] in cnt:
+        cnt[s[i]]=0
+    cnt[s[i]]+=1
+    # print(s[i],cnt[s[i]])
+
+max=[0,'A',False]
+for i in range(ord('A'),ord('a')):
+    k=chr(i)
+    if not k in cnt:
+        continue
+    else:
+        # print(cnt[k])
+        if max[0]<cnt[k]:
+            max[0]=cnt[k]
+            max[1]=k
+            max[2]=False
+        elif max[0]==cnt[k]:
+            max[2]=True
+
+if max[2]==True:
+    print("?")
+else:
+    print(max[1])
\ No newline at end of file
diff --git a/boj/11650.py b/boj/11650.py
new file mode 100644
index 0000000..912ca77
--- /dev/null
+++ b/boj/11650.py
@@ -0,0 +1,12 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+arr=[]
+
+for _ in range(n):
+    a,b=map(int,stdin.readline().rstrip().split())
+    arr.append((a,b))
+
+arr.sort(key=lambda x:(x[0],x[1]))
+
+for i in arr:
+    print(i[0],i[1])
\ No newline at end of file
diff --git a/boj/11651.py b/boj/11651.py
new file mode 100644
index 0000000..954460c
--- /dev/null
+++ b/boj/11651.py
@@ -0,0 +1,13 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+arr=[]
+
+for _ in range(n):
+    x,y=map(int,stdin.readline().rstrip().split())
+
+    arr.append((x,y))
+
+arr.sort(key=lambda x:(x[1],x[0]))
+
+for i in arr:
+    print(*i)
\ No newline at end of file
diff --git a/boj/11659.py b/boj/11659.py
new file mode 100644
index 0000000..795dbc5
--- /dev/null
+++ b/boj/11659.py
@@ -0,0 +1,12 @@
+from sys import stdin
+n,m=map(int,stdin.readline().rstrip().split())
+arr=list(map(int,stdin.readline().rstrip().split()))
+sarr=[]
+sarr.append(arr[0])
+
+for i in range(1,n):
+    sarr.append(sarr[i-1]+arr[i])
+
+for i in range(m):
+    a,b=map(int,stdin.readline().rstrip().split())
+    print(sarr[b-1]-sarr[a-1]+arr[a-1])
diff --git a/boj/11718.py b/boj/11718.py
new file mode 100644
index 0000000..6a883aa
--- /dev/null
+++ b/boj/11718.py
@@ -0,0 +1,5 @@
+while True:
+    try:
+        print(input())
+    except EOFError:
+        break
\ No newline at end of file
diff --git a/boj/11720.py b/boj/11720.py
new file mode 100644
index 0000000..5e62fc7
--- /dev/null
+++ b/boj/11720.py
@@ -0,0 +1,8 @@
+n=int(input())
+str=input()
+sum=0
+
+for i in range(n):
+    sum+=int(str[i])
+
+print(sum)
\ No newline at end of file
diff --git a/boj/11723.py b/boj/11723.py
new file mode 100644
index 0000000..3c700d6
--- /dev/null
+++ b/boj/11723.py
@@ -0,0 +1,28 @@
+import sys
+n=int(sys.stdin.readline().rstrip())
+arr=set()
+
+for _ in range(n):
+    com=sys.stdin.readline().rstrip().split()
+
+    if len(com)==1:
+        if com[0]=="all":
+            arr=set([i for i in range(1,21)])
+        else:
+            arr.clear()
+    else:
+        num=int(com[1])
+        if com[0]=="add":
+            arr.add(num)
+        elif com[0]=="remove":
+            arr.discard(num)
+        elif com[0]=="check":
+            if num in arr:
+                print(1)
+            else:
+                print(0)
+        elif com[0]=="toggle":
+            if num in arr:
+                arr.discard(num)
+            else:
+                arr.add(num)
diff --git a/boj/11726.py b/boj/11726.py
new file mode 100644
index 0000000..b7c77c9
--- /dev/null
+++ b/boj/11726.py
@@ -0,0 +1,7 @@
+n=int(input())
+arr=[0,1,2,3]
+
+for i in range(4,n+1):
+    arr.append(arr[i-1]+arr[i-2])
+
+print(arr[n]%10007)
\ No newline at end of file
diff --git a/boj/1181.py b/boj/1181.py
new file mode 100644
index 0000000..1e2e4be
--- /dev/null
+++ b/boj/1181.py
@@ -0,0 +1,25 @@
+# 데이터 개수(n)을 입력받음.
+n=int(input())
+# 데이터를 입력받아 쌓아둘 배열(리스트) 선언 및 초기화
+iarr=[]
+
+# 데이터 개수만큼 반복하여 데이터 받음.
+for i in range(n):
+  iarr.append(input())
+
+# 새 배열 변수 선언 및 초기화 - set형을 사용하여 기존 입력받은 배열 변환 : 중복 값 제거
+arr=list(set(iarr))
+# print(type(arr))
+# print(arr)
+
+# 배열 요소를 알파벳 순서대로 정렬
+arr.sort()
+# print(arr)
+
+# 정렬된 배열 요소를 다시 길이 순서대로 정렬
+arr.sort(key=len)
+# print(arr)
+
+# 출력 - 실제 정렬된 배열 요소 개수만큼 반복하여 출력
+for i in range(len(arr)):
+  print(arr[i])
diff --git a/boj/11866.py b/boj/11866.py
new file mode 100644
index 0000000..1259be1
--- /dev/null
+++ b/boj/11866.py
@@ -0,0 +1,30 @@
+from sys import stdin
+
+n,k=map(int,stdin.readline().rstrip().split())
+arr=[]
+sarr=set()
+i=k
+cnt=k
+
+while True:
+    if i>n:
+        i-=n
+
+    if i in sarr:
+        i+=1
+        continue
+    elif cnt%k==0:
+        arr.append(i)
+        sarr.add(i)
+
+    i+=1
+    cnt+=1
+    if len(arr)==n:
+        break
+
+print("<",end="")
+for i in range(n):
+    print(arr[i],end="")
+    if i<n-1:
+        print(", ",end="")
+print(">")
\ No newline at end of file
diff --git a/boj/1260.py b/boj/1260.py
new file mode 100644
index 0000000..a4dd1b5
--- /dev/null
+++ b/boj/1260.py
@@ -0,0 +1,65 @@
+# n=정점 수, m=간선 수, v=시작점
+n,m,v=map(int,input().split())
+# 정점에 연결되는 간선을 넣을 이중 리스트(배열)
+node=[[0]*n for _ in range(n)]
+# 각 DFS, BFS 결과를 넣을 리스트
+dfs=[]
+bfs=[]
+
+# 간선을 입력 받음
+for _ in range(m):
+    a,b=map(int,input().split())
+    # 해당 문제는 무방향(양방향) 그래프이므로, 양쪽 간선 배열에 모두 연결되었음을 표시해야 함.
+    node[a-1][b-1]=node[b-1][a-1]=1
+
+# - DFS 구현
+# 방문 여부를 담을 리스트를 모두 0으로 초기화
+visit=[0 for _ in range(n)]
+# 재귀를 이용하여 구현하기 위해 함수 선언
+def dfs_fun(now):
+    # 방문한 정점을 리스트에 추가하고, 방문 여부를 표시
+    dfs.append(now+1)
+    visit[now]=1
+    # 다음 정점 방문을 위해 반복
+    for i in range(n):
+        # 만약, 연결된 간선 중에 아직 방문하지 않은 정점이 있는 경우, 해당 정점을 방문하기 위해 재귀 실행
+        if node[now][i]==1 and visit[i]==0:
+            dfs_fun(i)
+
+# DFS 탐색 시작점을 정의
+start=v-1
+# DFS 재귀 탐색 함수 호출
+dfs_fun(start)
+
+# - BFS 구현
+# 첫 방문할 시작점을 정의
+now=v-1
+# 방문 여부를 담을 리스트를 0으로 초기화
+visit=[0 for _ in range(n)]
+# 현재 방문한 위치는 이미 방문한 것으로 함.
+visit[now]=1
+# 방문할 정점을 담을 리스트 변수 선언(큐 형태로 사용)
+queue=[]
+# 현재 방문한 위치는 큐에 추가
+queue.append(now)
+
+# BFS 탐색 시작
+while len(queue)>0:
+    # 현재 탐색 위치는 큐에서 빼오고, 방문한 정점 추가
+    now=queue.pop(0)
+    bfs.append(now+1)
+
+    # 다음 방문 위치를 큐에 추가하기 위해 반복
+    for i in range(n):
+        # 간선이 연결되어있지만, 아직 방문하지 않은 정점은 큐에 추가하여 다음에 방문할 수 있도록 함.
+        if node[now][i]==1 and visit[i]==0:
+            visit[i]=1
+            queue.append(i)
+
+# 결과 출력 (DFS, BFS 순)
+for i in range(len(dfs)):
+    print(dfs[i],end=" ")
+print() # 줄바꿈을 위한 빈 print 함수 실행
+
+for i in range(len(bfs)):
+    print(bfs[i],end=" ")
\ No newline at end of file
diff --git a/boj/12904.py b/boj/12904.py
new file mode 100644
index 0000000..5ad5134
--- /dev/null
+++ b/boj/12904.py
@@ -0,0 +1,16 @@
+import sys
+
+input=sys.stdin.readline
+a=input().rstrip()
+b=input().rstrip()
+bl=list(b)
+
+while len(a)<len(bl):
+    c=bl.pop()
+    if c=='B':
+        bl.reverse()
+
+if a==''.join(bl):
+    print(1)
+else:
+    print(0)
diff --git a/boj/1330.py b/boj/1330.py
new file mode 100644
index 0000000..fd0b572
--- /dev/null
+++ b/boj/1330.py
@@ -0,0 +1,8 @@
+a,b=map(int,input().split())
+
+if a>b:
+    print(">")
+elif a<b:
+    print("<")
+else:
+    print("==")
\ No newline at end of file
diff --git a/boj/1459.py b/boj/1459.py
new file mode 100644
index 0000000..1e91652
--- /dev/null
+++ b/boj/1459.py
@@ -0,0 +1,24 @@
+import sys
+input=sys.stdin.readline
+
+x,y,tw,ts=map(int,input().rstrip().split())
+tw2=tw*2
+ts2=ts*2
+sum=0
+
+minxy=min(x,y)
+if minxy>0:
+    sum+=(min(ts,tw2)*minxy)
+    x-=minxy
+    y-=minxy
+
+maxxy=max(x,y)
+if maxxy>0:
+    if (maxxy%2)==0:
+        sum+=(min(ts2,tw2)*int(maxxy/2))
+    elif maxxy>2:
+        sum+=(min(ts2,tw2)*int(maxxy/2)+tw)
+    else:
+        sum+=tw
+
+print(sum)
diff --git a/boj/14681.py b/boj/14681.py
new file mode 100644
index 0000000..785305a
--- /dev/null
+++ b/boj/14681.py
@@ -0,0 +1,11 @@
+x=int(input())
+y=int(input())
+
+if x>=0 and y>=0:
+    print(1)
+elif x<0 and y>=0:
+    print(2)
+elif x<0 and y<0:
+    print(3)
+else:
+    print(4)
\ No newline at end of file
diff --git a/boj/14916.py b/boj/14916.py
new file mode 100644
index 0000000..e29f5fd
--- /dev/null
+++ b/boj/14916.py
@@ -0,0 +1,11 @@
+n=int(input())
+count=0
+
+while n>0 and not n%5==0:
+	count+=1
+	n-=2
+
+if n>-1 and n%5==0:
+	print((n//5)+count)
+else:
+	print(-1)
\ No newline at end of file
diff --git a/boj/14940.py b/boj/14940.py
new file mode 100644
index 0000000..f30924a
--- /dev/null
+++ b/boj/14940.py
@@ -0,0 +1,41 @@
+from sys import stdin
+n,m=map(int,stdin.readline().rstrip().split())
+inmap=[[0]*m for _ in range(n)]
+visit=[[-1]*m for _ in range(n)]
+sx=sy=0
+
+for i in range(n):
+    s=list(map(int,stdin.readline().rstrip().split()))
+    for j in range(m):
+        if s[j]==2:
+            sx=i
+            sy=j
+        elif s[j]==0:
+            visit[i][j]=0
+        inmap[i][j]=s[j]
+
+dx=[1,0,-1,0]
+dy=[0,1,0,-1]
+next=[]
+next.append((sx,sy))
+visit[sx][sy]=0
+
+while len(next)>0:
+    now=next.pop(0)
+    i=now[0]
+    j=now[1]
+
+    for a in range(4):
+        ddx=i+dx[a]
+        ddy=j+dy[a]
+
+        if ddx==-1 or ddx==n or ddy==-1 or ddy==m:
+            continue
+        if inmap[ddx][ddy]==1 and visit[ddx][ddy]<=0:
+            next.append((ddx,ddy))
+            visit[ddx][ddy]=visit[i][j]+1
+
+for i in range(n):
+    for j in range(m):
+        print(visit[i][j],end=" ")
+    print()
\ No newline at end of file
diff --git a/boj/15552.py b/boj/15552.py
new file mode 100644
index 0000000..f82ae25
--- /dev/null
+++ b/boj/15552.py
@@ -0,0 +1,7 @@
+import sys
+
+n=int(sys.stdin.readline().rstrip())
+
+for _ in range(n):
+    a,b=map(int,sys.stdin.readline().rstrip().split())
+    print(a+b)
\ No newline at end of file
diff --git a/boj/15649.py b/boj/15649.py
new file mode 100644
index 0000000..5242f59
--- /dev/null
+++ b/boj/15649.py
@@ -0,0 +1,18 @@
+n,m=map(int,input().split())
+arr=[]
+ch=[0]*(n+1)
+
+def bt():
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in range(1,n+1):
+        if ch[i]==1:
+            continue
+        arr.append(i)
+        ch[i]=1
+        bt()
+        ch[arr.pop()]=0
+
+bt()
\ No newline at end of file
diff --git a/boj/15650.py b/boj/15650.py
new file mode 100644
index 0000000..9db081e
--- /dev/null
+++ b/boj/15650.py
@@ -0,0 +1,18 @@
+n,m=map(int,input().split())
+arr=[]
+ch=[0]*(n+1)
+
+def bt(s):
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in range(s,n+1):
+        if ch[i]==1:
+            continue
+        arr.append(i)
+        ch[i]=1
+        bt(i)
+        ch[arr.pop()]=0
+
+bt(1)
\ No newline at end of file
diff --git a/boj/15651.py b/boj/15651.py
new file mode 100644
index 0000000..d49942f
--- /dev/null
+++ b/boj/15651.py
@@ -0,0 +1,14 @@
+n,m=map(int,input().split())
+arr=[]
+
+def bt():
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in range(1,n+1):
+        arr.append(i)
+        bt()
+        arr.pop()
+
+bt()
\ No newline at end of file
diff --git a/boj/15652.py b/boj/15652.py
new file mode 100644
index 0000000..98551fc
--- /dev/null
+++ b/boj/15652.py
@@ -0,0 +1,14 @@
+n,m=map(int,input().split())
+arr=[]
+
+def bt(s):
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in range(s,n+1):
+        arr.append(i)
+        bt(i)
+        arr.pop()
+
+bt(1)
\ No newline at end of file
diff --git a/boj/15654.py b/boj/15654.py
new file mode 100644
index 0000000..4e45b1b
--- /dev/null
+++ b/boj/15654.py
@@ -0,0 +1,20 @@
+n,m=map(int,input().split())
+inarr=list(map(int,input().split()))
+arr=[]
+
+inarr.sort()
+
+def bt():
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in inarr:
+        if i in arr:
+            continue
+        
+        arr.append(i)
+        bt()
+        arr.pop()
+
+bt()
\ No newline at end of file
diff --git a/boj/15655.py b/boj/15655.py
new file mode 100644
index 0000000..14b8fd7
--- /dev/null
+++ b/boj/15655.py
@@ -0,0 +1,20 @@
+n,m=map(int,input().split())
+inarr=list(map(int,input().split()))
+arr=[]
+
+inarr.sort()
+
+def bt(s):
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in range(s,n):
+        v=inarr[i]
+        if v in arr:
+            continue
+        arr.append(v)
+        bt(i)
+        arr.pop()
+
+bt(0)
\ No newline at end of file
diff --git a/boj/15656.py b/boj/15656.py
new file mode 100644
index 0000000..80a0f0a
--- /dev/null
+++ b/boj/15656.py
@@ -0,0 +1,17 @@
+n,m=map(int,input().split())
+inarr=list(map(int,input().split()))
+arr=[]
+
+inarr.sort()
+
+def bt():
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in inarr:
+        arr.append(i)
+        bt()
+        arr.pop()
+
+bt()
\ No newline at end of file
diff --git a/boj/15657.py b/boj/15657.py
new file mode 100644
index 0000000..1043309
--- /dev/null
+++ b/boj/15657.py
@@ -0,0 +1,17 @@
+n,m=map(int,input().split())
+inarr=list(map(int,input().split()))
+arr=[]
+
+inarr.sort()
+
+def bt(p):
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    for i in range(p,n):
+        arr.append(inarr[i])
+        bt(i)
+        arr.pop()
+
+bt(0)
\ No newline at end of file
diff --git a/boj/15663.py b/boj/15663.py
new file mode 100644
index 0000000..c2bb6c2
--- /dev/null
+++ b/boj/15663.py
@@ -0,0 +1,23 @@
+n,m=map(int,input().split())
+inarr=list(map(int,input().split()))
+arr=[]
+ch=[False]*n
+
+inarr.sort()
+
+def bt():
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    l=0
+    for i in range(n):
+        if not ch[i] and l!=inarr[i]:
+            ch[i]=True
+            l=inarr[i]
+            arr.append(l)
+            bt()
+            ch[i]=False
+            arr.pop()
+
+bt()
\ No newline at end of file
diff --git a/boj/15664.py b/boj/15664.py
new file mode 100644
index 0000000..145ea41
--- /dev/null
+++ b/boj/15664.py
@@ -0,0 +1,23 @@
+n,m=map(int,input().split())
+inarr=list(map(int,input().split()))
+arr=[]
+ch=[False]*n
+
+inarr.sort()
+
+def bt(s):
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    l=0
+    for i in range(s,n):
+        if not ch[i] and l!=inarr[i]:
+            ch[i]=True
+            arr.append(inarr[i])
+            bt(i)
+            arr.pop()
+            ch[i]=False
+            l=inarr[i]
+
+bt(0)
\ No newline at end of file
diff --git a/boj/15665.py b/boj/15665.py
new file mode 100644
index 0000000..9b263c6
--- /dev/null
+++ b/boj/15665.py
@@ -0,0 +1,20 @@
+n,m=map(int,input().split())
+inarr=sorted(list(map(int,input().split())))
+arr=[]
+
+def bt():
+    if len(arr)==m:
+        print(*arr)
+        return
+    
+    l=0
+    for i in inarr:
+        if i==l:
+            continue
+
+        arr.append(i)
+        bt()
+        arr.pop()
+        l=i
+
+bt()
\ No newline at end of file
diff --git a/boj/1620.py b/boj/1620.py
new file mode 100644
index 0000000..f338afd
--- /dev/null
+++ b/boj/1620.py
@@ -0,0 +1,15 @@
+import sys
+n,m=map(int,sys.stdin.readline().rstrip().split())
+dic1=dict()
+dic2=dict()
+
+for i in range(1,n+1):
+    dic1[i]=sys.stdin.readline().rstrip()
+    dic2[dic1[i]]=i
+
+for _ in range(m):
+    s=sys.stdin.readline().rstrip()
+    try:
+        print(dic1.get(int(s)))
+    except:
+        print(dic2.get(s))
\ No newline at end of file
diff --git a/boj/1654.py b/boj/1654.py
new file mode 100644
index 0000000..66e95a4
--- /dev/null
+++ b/boj/1654.py
@@ -0,0 +1,27 @@
+from sys import stdin
+k,n=map(int,stdin.readline().rstrip().split())
+max=0
+arr=[]
+
+for _ in range(k):
+    a=int(stdin.readline().rstrip())
+    arr.append(a)
+
+    if a>max:
+        max=a
+
+l=1
+r=max
+while l<=r:
+    count=0
+    m=(l+r)//2
+    
+    for i in range(k):
+        count+=arr[i]//m
+
+    if count<n:
+        r=m-1
+    else:
+        l=m+1
+
+print(r)
\ No newline at end of file
diff --git a/boj/1676.py b/boj/1676.py
new file mode 100644
index 0000000..847ddc1
--- /dev/null
+++ b/boj/1676.py
@@ -0,0 +1,17 @@
+n=int(input())
+p=1
+
+for i in range(2,n+1):
+    p*=i
+res=str(p).split('0')
+
+count=0
+a=1
+while True:
+    if res=="" or not res[-a]=='':
+        break
+    
+    count+=1
+    a+=1
+
+print(count)
\ No newline at end of file
diff --git a/boj/17219.py b/boj/17219.py
new file mode 100644
index 0000000..8930dd2
--- /dev/null
+++ b/boj/17219.py
@@ -0,0 +1,10 @@
+import sys
+n,m=map(int,sys.stdin.readline().rstrip().split())
+acc=dict()
+
+for _ in range(n):
+    s1,s2=map(str,sys.stdin.readline().rstrip().split())
+    acc[s1]=s2
+for _ in range(m):
+    s=sys.stdin.readline().rstrip()
+    print(acc.get(s))
\ No newline at end of file
diff --git a/boj/1764.py b/boj/1764.py
new file mode 100644
index 0000000..2af0f2c
--- /dev/null
+++ b/boj/1764.py
@@ -0,0 +1,20 @@
+from sys import stdin
+n,m=map(int,stdin.readline().rstrip().split())
+
+noarr=set()
+for _ in range(n):
+    s=stdin.readline().rstrip()
+    noarr.add(s)
+
+carr=[]
+for _ in range(m):
+    s=stdin.readline().rstrip()
+
+    if s in noarr:
+        carr.append(s)
+
+carr.sort()
+
+print(len(carr))
+for i in carr:
+    print(i)
\ No newline at end of file
diff --git a/boj/1789.py b/boj/1789.py
new file mode 100644
index 0000000..907e010
--- /dev/null
+++ b/boj/1789.py
@@ -0,0 +1,9 @@
+s=int(input())
+count=1
+sum=1
+
+while sum<=s:
+    count+=1
+    sum+=count
+
+print(count-1)
\ No newline at end of file
diff --git a/boj/18108.py b/boj/18108.py
new file mode 100644
index 0000000..fdd5531
--- /dev/null
+++ b/boj/18108.py
@@ -0,0 +1 @@
+print(int(input())-543)
\ No newline at end of file
diff --git a/boj/18110.py b/boj/18110.py
new file mode 100644
index 0000000..c0a0865
--- /dev/null
+++ b/boj/18110.py
@@ -0,0 +1,34 @@
+from sys import stdin
+
+# 파이썬 내 반올림 함수(round)의 '오사오입' 방식이 아닌 일반 '사사오입' 방식의 결과를 도출하기 위해 별도의 함수 정의
+# 공식 : round(<대상 값>+10^(-<대상 값의 길이>-1))
+#  => 예시 : (대상=3.5) => 3.5+10^(-3-1) = 3.5+10^-4 = 3.5+0.0001 = 3.5001
+def round_func(value):
+    return round(value+10**(-len(str(value))-1))
+
+n=int(stdin.readline().rstrip())
+res=0
+
+# 데이터의 갯수가 0(없음)일 수도 있으므로 0인지 검증
+if n>0:
+    arr=[]
+    sum=0
+    for _ in range(n):
+        a=int(stdin.readline().rstrip())
+        arr.append(a)
+        sum+=a
+    arr.sort()
+
+    # 제외해야하는 범위 산출 - 반올림 필요
+    b=round_func(n*0.15)
+    # 제외된 범위의 합계를 저장할 변수
+    bsum=0
+    for i in range(b):
+        # 리스트는 정렬 상태이므로, 앞쪽에는 최소, 뒤쪽에는 최대 값이 들어있게 됨.
+        # 제외 범위 앞쪽과 뒤쪽의 값을 더하여 합계 변수에 더함.
+        bsum+=(arr[i]+arr[-i-1])
+
+    # 결과 값 계산(총합에서 범위 외 합계 제외, 개수 또한 제외) - 반올림 필요
+    res=round_func((sum-bsum)/(n-b*2))
+
+print(res)
\ No newline at end of file
diff --git a/boj/18870.py b/boj/18870.py
new file mode 100644
index 0000000..c656c0d
--- /dev/null
+++ b/boj/18870.py
@@ -0,0 +1,12 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+arr=list(map(int,stdin.readline().rstrip().split()))
+sarr=sorted(set(arr))
+carr=dict()
+
+for i in range(len(sarr)-1,-1,-1):
+    j=sarr.pop()
+    carr[j]=i
+
+for i in arr:
+    print(carr[i],end=" ")
\ No newline at end of file
diff --git a/boj/1920.py b/boj/1920.py
new file mode 100644
index 0000000..ec6d913
--- /dev/null
+++ b/boj/1920.py
@@ -0,0 +1,12 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+a=set(map(int,stdin.readline().rstrip().split()))
+
+m=int(stdin.readline().rstrip())
+b=list(map(int,stdin.readline().rstrip().split()))
+
+for i in range(m):
+    if b[i] in a:
+        print(1)
+    else:
+        print(0)
\ No newline at end of file
diff --git a/boj/1927.py b/boj/1927.py
new file mode 100644
index 0000000..6575d23
--- /dev/null
+++ b/boj/1927.py
@@ -0,0 +1,19 @@
+from sys import stdin
+from queue import PriorityQueue
+n=int(stdin.readline().rstrip())
+# 원래 set을 사용하여 구현하려고 했었는데, 만약, 데이터 중에서 중복 값이 있는 경우, 중복 값이 제거되어서는 안되므로 정답으로 인정되지 않을 가능성을 고려하여 사용하지 않음.
+# l=set()
+
+# 우선순위 큐 객체 생성
+q=PriorityQueue()
+
+for _ in range(n):
+    i=int(stdin.readline().rstrip())
+
+    if i==0:
+        if q.qsize()>0:
+            print(q.get())
+        else:
+            print("0")
+    else:
+        q.put(i)
\ No newline at end of file
diff --git a/boj/1931.py b/boj/1931.py
new file mode 100644
index 0000000..084dded
--- /dev/null
+++ b/boj/1931.py
@@ -0,0 +1,16 @@
+n=int(input())
+arr=[]
+
+for _ in range(n):
+    arr.append(tuple(map(int,input().split())))
+
+arr.sort(key=lambda x:(x[1],x[0]))
+last=0
+count=0
+
+for i in arr:
+    if i[0] >= last:
+        count+=1
+        last=i[1]
+
+print(count)
\ No newline at end of file
diff --git a/boj/1966.py b/boj/1966.py
new file mode 100644
index 0000000..027fbc6
--- /dev/null
+++ b/boj/1966.py
@@ -0,0 +1,33 @@
+from sys import stdin
+t=int(stdin.readline().rstrip())
+
+for _ in range(t):
+    n,m=map(int,stdin.readline().rstrip().split())
+    tarr=list(map(int,stdin.readline().rstrip().split()))
+    arr=[]
+    q=[]
+
+    for i in range(n):
+        arr.append((tarr[i],i))
+        q.append(arr[i])
+    
+    arr.sort(key=lambda x:-x[0])
+
+    i=0
+    cnt=0
+    next=arr.pop(0)
+    while True:
+        now=q.pop(0)
+
+        if now[0]==next[0]:
+            if len(arr)>0:
+                next=arr.pop(0)
+            cnt+=1
+        else:
+            q.append(now)
+            continue
+        
+        if now[1]==m:
+            break
+    
+    print(cnt)
\ No newline at end of file
diff --git a/boj/2075.py b/boj/2075.py
new file mode 100644
index 0000000..839588d
--- /dev/null
+++ b/boj/2075.py
@@ -0,0 +1,15 @@
+from sys import stdin
+import heapq
+n=int(stdin.readline().rstrip())
+hq=[]
+
+for _ in range(n):
+    a=list(map(int,stdin.readline().rstrip().split()))
+
+    for i in a:
+        if len(hq)<=n or i>hq[0]:
+            heapq.heappush(hq,i)
+            if len(hq)>n:
+                heapq.heappop(hq)
+
+print(heapq.heappop(hq))
\ No newline at end of file
diff --git a/boj/21736.py b/boj/21736.py
new file mode 100644
index 0000000..cff3ca5
--- /dev/null
+++ b/boj/21736.py
@@ -0,0 +1,42 @@
+from sys import stdin
+from collections import deque
+n,m=map(int,stdin.readline().rstrip().split())
+arr=[['']*m for _ in range(n)]
+sx=sy=0
+
+for i in range(n):
+    li=stdin.readline().rstrip()
+    for j in range(m):
+        arr[i][j]=li[j]
+        if li[j]=='I':
+            sx=i
+            sy=j
+
+dx=[1,0,-1,0]
+dy=[0,1,0,-1]
+
+cnt=0
+next=deque()
+next.append((sx,sy))
+arr[sx][sy]='C'
+
+while next:
+    now=next.pop()
+
+    for i in range(4):
+        ddx=now[0]+dx[i]
+        ddy=now[1]+dy[i]
+
+        if ddx<0 or ddy<0 or ddx>=n or ddy>=m:
+            continue
+        c=arr[ddx][ddy]
+        if c=='O' or c=='P':
+            if c=='P':
+                cnt+=1
+            next.append((ddx,ddy))
+            arr[ddx][ddy]='C'
+
+if cnt==0:
+    print('TT')
+else:
+    print(cnt)
\ No newline at end of file
diff --git a/boj/2178.py b/boj/2178.py
new file mode 100644
index 0000000..3e9333d
--- /dev/null
+++ b/boj/2178.py
@@ -0,0 +1,35 @@
+from sys import stdin
+from collections import deque   # deque 사용 연습 겸
+n,m=map(int,stdin.readline().rstrip().split())
+arr=[[0]*m for _ in range(n)]
+
+for i in range(n):
+    s=stdin.readline().rstrip()
+
+    for j in range(m):
+        arr[i][j]=int(s[j])
+
+dx=[1,0,-1,0]
+dy=[0,1,0,-1]
+i=j=0
+next=deque()
+visit=[[0]*m for _ in range(n)]
+
+next.append((i,j))
+visit[i][j]=1
+while len(next):
+    now=next.popleft()
+    i=now[0]
+    j=now[1]
+
+    for a in range(4):
+        ddx=i+dx[a]
+        ddy=j+dy[a]
+
+        if ddx==-1 or ddx==n or ddy==-1 or ddy==m:
+            continue
+        if arr[ddx][ddy]==1 and visit[ddx][ddy]<=0:
+            next.append((ddx,ddy))
+            visit[ddx][ddy]=visit[i][j]+1
+
+print(visit[n-1][m-1])
\ No newline at end of file
diff --git a/boj/24060.py b/boj/24060.py
new file mode 100644
index 0000000..73c328b
--- /dev/null
+++ b/boj/24060.py
@@ -0,0 +1,44 @@
+import sys
+
+n,k=map(int,sys.stdin.readline().rstrip().split())
+oarr=list(map(int,sys.stdin.readline().rstrip().split()))
+karr=[]
+
+def merge_sort(l,r):
+    if l<r:
+        q=int((l+r)/2)
+        merge_sort(l,q)
+        merge_sort(q+1,r)
+        merge(l,q,r)
+
+def merge(l,q,r):
+    tarr=[]
+    i=l
+    j=q+1
+
+    while i<=q and j<=r:
+        if oarr[i]<oarr[j]:
+            tarr.append(oarr[i])
+            karr.append(oarr[i])
+            i+=1
+        else:
+            tarr.append(oarr[j])
+            karr.append(oarr[j])
+            j+=1
+    while i<=q:
+        tarr.append(oarr[i])
+        karr.append(oarr[i])
+        i+=1
+    while j<=r:
+        tarr.append(oarr[j])
+        karr.append(oarr[j])
+        j+=1
+    
+    for t in range(len(tarr)):
+        oarr[t+l]=tarr[t]
+
+merge_sort(0,n-1)
+if len(karr)<k:
+    print(-1)
+else:
+    print(karr[k-1])
\ No newline at end of file
diff --git a/boj/2438.py b/boj/2438.py
new file mode 100644
index 0000000..7b1c098
--- /dev/null
+++ b/boj/2438.py
@@ -0,0 +1,9 @@
+a=int(input())
+
+for i in range(1,a+1):
+    print("*"*i)
+
+# for i in range(a):
+#     for _ in range(i+1):
+#         print("*",end="")
+#     print()
\ No newline at end of file
diff --git a/boj/2439.py b/boj/2439.py
new file mode 100644
index 0000000..8fd579d
--- /dev/null
+++ b/boj/2439.py
@@ -0,0 +1,4 @@
+n=int(input())
+
+for i in range(1,n+1):
+    print("".rjust((n-i)," ")+("*"*i))
diff --git a/boj/2525.py b/boj/2525.py
new file mode 100644
index 0000000..4642bf1
--- /dev/null
+++ b/boj/2525.py
@@ -0,0 +1,12 @@
+h,m=map(int,input().split())
+w=int(input())
+
+m+=w
+if m>=60:
+    wh=int(m/60)
+    h+=wh
+    if h>23:
+        h-=24
+    m-=wh*60
+
+print(h,m)
\ No newline at end of file
diff --git a/boj/25304.py b/boj/25304.py
new file mode 100644
index 0000000..bc28be7
--- /dev/null
+++ b/boj/25304.py
@@ -0,0 +1,12 @@
+x=int(input())
+n=int(input())
+sum=0
+
+for _ in range(n):
+    a,b=map(int,input().split())
+    sum+=a*b
+
+if sum==x:
+    print("Yes")
+else:
+    print("No")
\ No newline at end of file
diff --git a/boj/25314.py b/boj/25314.py
new file mode 100644
index 0000000..0be3502
--- /dev/null
+++ b/boj/25314.py
@@ -0,0 +1,10 @@
+n=int(input())
+
+# 1안
+print("long "*(int(n/4)),end="")
+print("int")
+
+#2안
+# for _ in range(int(n/4)):
+#     print("long",end=" ")
+# print("int")
\ No newline at end of file
diff --git a/boj/2562.py b/boj/2562.py
new file mode 100644
index 0000000..3f0e489
--- /dev/null
+++ b/boj/2562.py
@@ -0,0 +1,7 @@
+arr=[]
+for i in range(9):
+    arr.append([int(input()),i+1])
+
+arr.sort()
+print(arr[-1][0])
+print(arr[-1][1])
\ No newline at end of file
diff --git a/boj/2568.py b/boj/2568.py
new file mode 100644
index 0000000..0a309f8
--- /dev/null
+++ b/boj/2568.py
@@ -0,0 +1,38 @@
+import bisect
+from sys import stdin
+input=stdin.readline
+n=int(input())
+arr=[]
+
+for i in range(n):
+    inp=tuple(map(int,input().split()))
+    arr.append(inp)
+
+arr.sort(key=lambda x:x[1])
+l=[0]
+lt=[(0,0)]
+
+for i in arr:
+    a,b=i
+    if l[-1]<a:
+        l.append(a)
+        lt.append((a,len(l)-1))
+    else:
+        p=bisect.bisect_left(l,a)
+        l[p]=a
+        lt.append((a,p))
+
+target=len(l)-1
+darr=[]
+
+for i in lt[::-1]:
+    if i[1]==target:
+        target-=1
+    else:
+        darr.append(i[0])
+
+# print(darr)
+darr.sort()
+print(len(darr))
+for i in darr:
+    print(i)
\ No newline at end of file
diff --git a/boj/2588.py b/boj/2588.py
new file mode 100644
index 0000000..ffd9d85
--- /dev/null
+++ b/boj/2588.py
@@ -0,0 +1,8 @@
+a=int(input())
+b1=b2=int(input())
+
+for i in range(1,4):
+    print(a*(b2%10))
+    b2=int(b2/10)
+
+print(a*b1)
\ No newline at end of file
diff --git a/boj/2606.py b/boj/2606.py
new file mode 100644
index 0000000..7457602
--- /dev/null
+++ b/boj/2606.py
@@ -0,0 +1,29 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+m=int(stdin.readline().rstrip())
+arr=[[0]*n for _ in range(n)]
+
+for _ in range(m):
+    a,b=map(int,stdin.readline().rstrip().split())
+    a-=1
+    b-=1
+    arr[a][b]=arr[b][a]=1
+
+visit=[0 for _ in range(n)]
+visit[0]=1
+next=[]
+i=0
+cnt=0
+while True:
+    for j in range(n):
+        if visit[j]==0 and arr[i][j]==1:
+            cnt+=1
+            visit[j]=1
+            next.append(j)
+    
+    if len(next)==0:
+        break
+    else:
+        i=next.pop()
+
+print(cnt)
\ No newline at end of file
diff --git a/boj/2751.py b/boj/2751.py
new file mode 100644
index 0000000..ed46032
--- /dev/null
+++ b/boj/2751.py
@@ -0,0 +1,10 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+arr=[]
+for _ in range(n):
+    arr.append(int(stdin.readline().rstrip()))
+
+arr.sort()
+
+for a in arr:
+    print(a)
\ No newline at end of file
diff --git a/boj/2753.py b/boj/2753.py
new file mode 100644
index 0000000..6f9b5c5
--- /dev/null
+++ b/boj/2753.py
@@ -0,0 +1,6 @@
+y=int(input())
+
+if (y%4==0 and not y%100==0) or y%400==0:
+    print(1)
+else:
+    print(0)
\ No newline at end of file
diff --git a/boj/2839.py b/boj/2839.py
new file mode 100644
index 0000000..9e5ab40
--- /dev/null
+++ b/boj/2839.py
@@ -0,0 +1,16 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+res=0
+
+while n>0:
+    if n%5==0:
+        res+=n//5
+        break
+    n-=3
+    res+=1
+
+    if n==1 or n==2:
+        res=-1
+        break
+    
+print(res)
\ No newline at end of file
diff --git a/boj/2884.py b/boj/2884.py
new file mode 100644
index 0000000..5c2fa77
--- /dev/null
+++ b/boj/2884.py
@@ -0,0 +1,11 @@
+h,m=map(int,input().split())
+
+if m-45<0:
+    h-=1
+    if h<0:
+        h+=24
+    m+=-45+60
+else:
+    m-=45
+
+print(h,m)
\ No newline at end of file
diff --git a/boj/2885.py b/boj/2885.py
new file mode 100644
index 0000000..e0fbaeb
--- /dev/null
+++ b/boj/2885.py
@@ -0,0 +1,18 @@
+k=int(input())
+n=1
+
+while n<k:
+	n*=2
+
+count=0
+s=0
+d=n
+if not n==k:
+	while not s==k:
+		di=d//2
+		if s+di<=k:
+			s+=di
+		d/=2
+		count+=1
+
+print(n,count)
\ No newline at end of file
diff --git a/boj/2960.py b/boj/2960.py
new file mode 100644
index 0000000..c2c09d5
--- /dev/null
+++ b/boj/2960.py
@@ -0,0 +1,21 @@
+from sys import stdin
+n,k=map(int,stdin.readline().rstrip().split())
+arr=[False for i in range(n+1)]
+cnt=[0,0,False]
+
+for i in range(2,n+1):
+    for j in range(i,n+1,i):
+        if arr[j]==True:
+            continue
+        
+        arr[j]=True
+        cnt[0]+=1
+
+        if cnt[0]==k:
+            cnt[1]=j
+            cnt[2]=True
+            break
+    if cnt[2]==True:
+        break
+    
+print(cnt[1])
\ No newline at end of file
diff --git a/boj/3273.py b/boj/3273.py
new file mode 100644
index 0000000..02c57bc
--- /dev/null
+++ b/boj/3273.py
@@ -0,0 +1,24 @@
+import sys
+n=int(sys.stdin.readline().rstrip())
+arr=list(map(int,sys.stdin.readline().rstrip().split()))
+x=int(sys.stdin.readline().rstrip())
+
+count=0
+start=0
+end=n-1
+arr.sort()
+
+while True:
+    if start==end:
+        break
+    
+    res=arr[start]+arr[end]
+    if res==x:
+        count+=1
+        end-=1
+    elif res>x:
+        end-=1
+    else:
+        start+=1
+
+print(count)
\ No newline at end of file
diff --git a/boj/4949.py b/boj/4949.py
new file mode 100644
index 0000000..757aa6e
--- /dev/null
+++ b/boj/4949.py
@@ -0,0 +1,37 @@
+from sys import stdin
+
+while True:
+    s=stdin.readline().rstrip()
+    st=[]
+
+    if s=='.':
+        break
+    
+    suc=True
+    for i in range(len(s)):
+        c=s[i]
+
+        if c=='(' or c=='{' or c=='[':
+            st.append(c)
+        elif c==')' or c=='}' or c==']':
+            if len(st)==0:
+                suc=False
+                break
+            
+            p=st.pop()
+            if c==')' and not p=='(':
+                suc=False
+                break
+            elif c=='}' and not p=='{':
+                suc=False
+                break
+            elif c==']' and not p=='[':
+                suc=False
+                break
+    if len(st)>0:
+        suc=False
+
+    if suc:
+        print("yes")
+    else:
+        print("no")
\ No newline at end of file
diff --git a/boj/7662.py b/boj/7662.py
new file mode 100644
index 0000000..4f90297
--- /dev/null
+++ b/boj/7662.py
@@ -0,0 +1,48 @@
+from sys import stdin
+import heapq
+n=int(stdin.readline().rstrip())
+
+for a in range(n):
+    m=int(stdin.readline().rstrip())
+    maxh,minh=[],[]
+    isdel=dict()
+    cnt=0
+    
+    for i in range(m):
+        s=list(map(str,stdin.readline().rstrip().split()))
+        v=int(s[1])
+
+        if s[0]=='I':
+                heapq.heappush(maxh,(-v,i))
+                heapq.heappush(minh,(v,i))
+                isdel[i]=True
+                cnt+=1
+        else:
+            if cnt>0:
+                if v==-1:
+                    while minh and not isdel[minh[0][1]]:
+                        heapq.heappop(minh)
+                    d=heapq.heappop(minh)
+                else:
+                    while maxh and not isdel[maxh[0][1]]:
+                        heapq.heappop(maxh)
+                    d=heapq.heappop(maxh)
+                # print(d[0],d[1])
+                isdel[d[1]]=False
+                cnt-=1
+            else:
+                continue
+    
+    # print(maxh)
+    # print(minh)
+    while minh and not isdel[minh[0][1]]:
+        heapq.heappop(minh)
+    while maxh and not isdel[maxh[0][1]]:
+        heapq.heappop(maxh)
+
+    # print(maxh)
+    # print(minh)
+    if cnt>0:
+        print(-maxh[0][0],minh[0][0])
+    else:
+        print("EMPTY")
\ No newline at end of file
diff --git a/boj/8393.py b/boj/8393.py
new file mode 100644
index 0000000..d3629f8
--- /dev/null
+++ b/boj/8393.py
@@ -0,0 +1,6 @@
+n=int(input())
+sum=0
+
+for i in range(1,n+1):
+    sum+=i
+print(sum)
\ No newline at end of file
diff --git a/boj/9095.py b/boj/9095.py
new file mode 100644
index 0000000..1c9082c
--- /dev/null
+++ b/boj/9095.py
@@ -0,0 +1,11 @@
+from sys import stdin
+n=int(stdin.readline().rstrip())
+
+for _ in range(n):
+    arr=[1,2,4]
+    i=int(stdin.readline().rstrip())-1
+
+    for j in range(3,i+1):
+        arr.append(arr[j-3]+arr[j-2]+arr[j-1])
+    
+    print(arr[i])
diff --git a/boj/9461.py b/boj/9461.py
new file mode 100644
index 0000000..81d2bc1
--- /dev/null
+++ b/boj/9461.py
@@ -0,0 +1,9 @@
+from sys import stdin
+t=int(stdin.readline().rstrip())
+
+for i in range(t):
+    n=int(stdin.readline().rstrip())
+    arr=[1,1,1]
+    for j in range(3,n):
+        arr.append(arr[j-3]+arr[j-2])
+    print(arr[n-1])
\ No newline at end of file
diff --git a/boj/9498.py b/boj/9498.py
new file mode 100644
index 0000000..106914b
--- /dev/null
+++ b/boj/9498.py
@@ -0,0 +1,12 @@
+a=int(input())
+
+if a>=90:
+    print("A")
+elif a>=80:
+    print("B")
+elif a>=70:
+    print("C")
+elif a>=60:
+    print("D")
+else:
+    print("F")
\ No newline at end of file
diff --git a/swea/12368.py b/swea/12368.py
new file mode 100644
index 0000000..06c7c5a
--- /dev/null
+++ b/swea/12368.py
@@ -0,0 +1,9 @@
+n=int(input())
+
+for i in range(n):
+	a,b=map(int,input().split())
+	result=a+b
+
+	if result>23:
+		result-=24
+	print("#"+str(i+1),result)
diff --git a/swea/1288.py b/swea/1288.py
new file mode 100644
index 0000000..3344135
--- /dev/null
+++ b/swea/1288.py
@@ -0,0 +1,17 @@
+t=int(input())
+
+for i in range(1,t+1):
+	n=int(input())
+	
+	check=set()
+	x=1
+	xn=0
+	while True:
+		xn=x*n
+		for a in str(xn):
+			check.add(a)
+
+		if len(check)==10:
+			break
+		x+=1
+	print("#"+str(i),(x*n))
diff --git a/swea/1986.py b/swea/1986.py
new file mode 100644
index 0000000..f6d2886
--- /dev/null
+++ b/swea/1986.py
@@ -0,0 +1,12 @@
+n=int(input())
+
+for i in range(1,n+1):
+    k=int(input())
+
+    result=0
+    for j in range(1,k+1):
+        if j%2==0:
+            result-=j
+        else:
+            result+=j
+    print("#"+str(i),result)