/in/foo.cc: In function 'int main()':
/in/foo.cc:38:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if(nx < 0 || ny < 0 || nx >= n || ny >= m || vis[nx][ny])
    ^~
/in/foo.cc:41:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     vis[nx][ny] = 1;
     ^~~