Compilare: user.cpp: In function ‘void sol()’: user.cpp:128:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < rez.size(); ++i) { ^ user.cpp:130:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i != rez.size() - 1) ^ user.cpp: In function ‘int main()’: user.cpp:137:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("becuriacm.in", "r", stdin); ^ user.cpp:138:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("becuriacm.out", "w", stdout); ^