first commit

from old repository to a new repository

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)