Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r.size() < i) { ^ user.cpp:22:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < in && r.size() < i; j ++) ^ user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < r.size(); i ++) cout << r[i] << "\n"; ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reguli.in", "rt", stdin); ^ user.cpp:12:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reguli.out", "wt", stdout); ^