/in/foo.cc: In function 'int main()':
/in/foo.cc:52:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if(b)
    ^~
/in/foo.cc:53:14: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     cout<<b; return 0;
              ^~~~~~
/in/foo.cc: In function 'int dfs(int, int, int, int)':
/in/foo.cc:35:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^