Compilare: user.cpp: In function ‘long long int Solve(int)’: user.cpp:107:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (k < buckets[i].size() && buckets[i][k].first + buckets[i][k].second >= j) { ^ user.cpp: In function ‘char Advance()’: user.cpp:22:38: 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, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:129:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("queries.in", "r", stdin); ^ user.cpp:130:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("queries.out", "w", stdout); ^