first commit

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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])