Compilare: user.cpp: In function ‘std::vector<int> sol(std::vector<int>)’: user.cpp:9:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v.size(); i++) ~^~~~~~~~~ user.cpp:11:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==v.size()-1 && v[i]/(i+2)) ~^~~~~~~~~~~~ user.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i<v.size()-1) ~^~~~~~~~~~~ user.cpp: In function ‘int main()’: 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("bazaf.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("bazaf.out", "2", stdout); ^