Compilare: user.cpp: In function ‘void merge(std::vector<int>&, int, int, int)’: user.cpp:11:6: warning: unused variable ‘backupRight’ [-Wunused-variable] int backupRight = right; ^ user.cpp: In function ‘int main()’: user.cpp:82:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sorted.size(); i++) ^ user.cpp:70:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in", "r", stdin); ^ user.cpp:71:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out", "w", stdout); ^