Compilare: user.cpp: In function ‘void Add_to(std::vector<int>&, std::vector<int>)’: user.cpp:94:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<b.size(); i++) ^ user.cpp: In function ‘std::pair<int, int> get_answer(int, std::vector<int>, std::vector<int>, int)’: user.cpp:103:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<componente[comp_index].size(); j++) ^ user.cpp:106:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<con1.size(); j++) ^ user.cpp:109:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<con0.size(); j++) ^ user.cpp:120:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<componente[comp_index].size(); j++) ^ user.cpp:128:69: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (Cod_Nod[*it] >= componente[comp_index].size()) continue; ^ user.cpp: In function ‘void dp_dfs(int)’: user.cpp:195:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<componente[IsComponent[*it]].size(); j++) ^ user.cpp:208:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<componente[IsComponent[*it]].size(); j++) ^ user.cpp: In function ‘void Solve(int)’: user.cpp:251:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<componente.size(); i++) ^ user.cpp:257:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<componente.size(); i++) ^ user.cpp:268:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<componente[0].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:288:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ro.in", "r", stdin); ^ user.cpp:289:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ro.out", "w", stdout); ^ user.cpp:291:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:294:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &cost[i]); ^