Compilare: user.cpp: In function ‘int main()’: user.cpp:52:10: warning: unused variable ‘f’ [-Wunused-variable] FILE*f = freopen("algsort.in", "r", stdin); ^ user.cpp:53:10: warning: unused variable ‘g’ [-Wunused-variable] FILE*g = freopen("algsort.out", "w", stdout); ^ user.cpp:55:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:57:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^