Compilare: user.cpp: In function ‘int main()’: user.cpp:139:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Ans.size(); ++i) ^ user.cpp:68:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colectie.in", "r", stdin); ^ user.cpp:69:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colectie.out", "w", stdout); ^ user.cpp:71:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &K); ^ user.cpp:75:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M[i][j]); ^ user.cpp: In member function ‘bool cmp::operator()(const std::vector<int>&, const std::vector<int>&) const’: user.cpp:35:5: warning: control reaches end of non-void function [-Wreturn-type] } ^