Borderou de evaluare (job #810091)

Eroare de compilare: main.cpp: In function 'int main()': main.cpp:28:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::__cxx11::basic_string<char> > >::size_type' {aka 'unsigned int'} [-Wsign-compare] 28 | for(int i=0; i<keys.size(); i++) | ~^~~~~~~~~~~~ main.cpp:18:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result] 18 | {freopen("criptic.in", "r", stdin); freopen("criptic.out", "w", stdout); | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:18:52: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result] 18 | {freopen("criptic.in", "r", stdin); freopen("criptic.out", "w", stdout); | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~