Compilare: user.cpp: In function ‘int main()’: user.cpp:95:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < solution[i].size(); ++j) ^ user.cpp:77:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("rmvc.in", "r", stdin); ^ user.cpp:78:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("rmvc.out", "w", stdout); ^