Compilare: main.cpp: In function 'void Dfs(int, int)': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < _ans.size(); ++i ) { ~~^~~~~~~~~~~~~ main.cpp:70:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < _ans[i].size(); ++j ) ~~^~~~~~~~~~~~~~~~ main.cpp:70:8: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for( int j = 0; j < _ans[i].size(); ++j ) ^~~ main.cpp:71:37: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout << _ans[i][j] << ' '; fout << '\n'; ^~~~