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].first <= s[i]) ~~~~~~~~~^~~~~~~~ main.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (h.size() > at && eval(i, h.back().first) <= ~~~~~~~~~^~~~ main.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (h.size() > at) { ~~~~~~~~~^~~~