foo.cc: In function 'void dfs(int)':
foo.cc:7:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    7 |     for(int i=0;i<V;i++)
      |     ^~~
foo.cc:9:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    9 |  f[0]=0;
      |  ^

[Hydro](https://hydro.ac)提供评测服务