Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:67:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int &p = last[node];p < graph[node].size();++p) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void SolveTest()': main.cpp:143:29: warning: right operand of comma operator has no effect [-Wunused-value] left = 0, right = M, mid; ^ main.cpp:156:29: warning: right operand of comma operator has no effect [-Wunused-value] left = 0, right = M, mid; ^ main.cpp:155:23: warning: 'answer' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << answer << " "; ^~~