Compilare: main.cpp: In function 'std::pair<long long int, int> Solve(const std::vector<int>&, long long int, int)': main.cpp:61:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (h.size() > at + 1 && h[at + 1].first <= s[i]) ~~~~~~~~~^~~~~~~~ main.cpp:66:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (h.size() > at && eval(i, h.back().first) <= ~~~~~~~~~^~~~ main.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (h.size() > at) { ~~~~~~~~~^~~~ main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:15:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, in); ^ main.cpp: In member function 'void InputReader::advance()': main.cpp:38:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, in); ^