Compilare: user.cpp: In function ‘int main()’: user.cpp:41:10: warning: unused variable ‘fin’ [-Wunused-variable] FILE*fin=freopen("sortaret.in","r",stdin); ^ user.cpp:42:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:45:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^