Compilare: user.cpp: In function ‘void dfs(std::vector<std::vector<long int> >&, std::vector<bool>&, int, int, std::vector<int>&, long int&, std::vector<std::vector<elements> >&)’: user.cpp:18:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lista_ad[node_id].size(); i++) { ^ user.cpp: In function ‘void dfs2(std::vector<std::vector<long int> >&, std::vector<bool>&, int, std::vector<int>&, long int&, std::vector<std::vector<elements> >&)’: user.cpp:41:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < componente[e.p].size(); j++) { ^ user.cpp:50:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lista_ad[node_id].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:117:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < componente[i].size(); j++) { ^ user.cpp:68:10: warning: unused variable ‘comp_conexe’ [-Wunused-variable] long comp_conexe = 0, N, id1, id2; ^ user.cpp:69:10: warning: unused variable ‘M’ [-Wunused-variable] long M; ^ user.cpp:70:12: warning: unused variable ‘K’ [-Wunused-variable] int T, K, player; ^ user.cpp:70:15: warning: unused variable ‘player’ [-Wunused-variable] int T, K, player; ^ user.cpp:66:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nustiu.in", "r", stdin); ^ user.cpp:67:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nustiu.out", "w", stdout); ^ user.cpp:72:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:74:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld", &N); ^ user.cpp:84:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld", &id1, &id2); ^