Compilare: user.cpp: In function ‘int main()’: user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ans.size(); i++) { ^ user.cpp:23:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sediu.in", "r", stdin); ^ user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sediu.out", "w", stdout); ^