Compilare: user.cpp: In function ‘std::vector<long long int> Solve(std::string)’: user.cpp:51:15: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] for (auto x : intervals) { ^ user.cpp: In function ‘int main()’: user.cpp:76:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("slide.in", "r", stdin); ^ user.cpp:77:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("slide.out", "w", stdout); ^