Compilare: user.cpp: In constructor ‘IntervalTree::IntervalTree(const std::vector<int>&)’: user.cpp:21:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < values.size(); ++i) { ^ user.cpp: In member function ‘void IntervalTree::UpdateInternal(int, int, int, int, int)’: user.cpp:54:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (node >= segments_.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:78:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in","r",stdin); ^ user.cpp:79:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.out","w", stdout); ^ user.cpp:81:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &num_values, &num_queries); ^ user.cpp:85:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &values[i]); ^ user.cpp:90:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &type, &left_pos, &right_pos); ^