Compilare: user.cpp: In function ‘void dfs(const int&)’: user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[nod].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:121:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < SOL[ minSOL[i].second ].size(); j ++) ^ user.cpp:88:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.in", "r", stdin); ^