Compilare: main.cpp: In function 'std::pair<long long int, int> Solve(const std::vector<int>&, long long int)': main.cpp:23:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (h.size() > at + 1 && h[at + 1].second <= i) ~~~~~~~~~^~~~~~~~ main.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (h.size() > at) { ~~~~~~~~~^~~~ main.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (h.size() > at) { ~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:53:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cubeon.in", "r", stdin); ^