Compilare: user.cpp: In function ‘int main()’: user.cpp:13:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d, k, nn; ^ user.cpp:13:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, d, k, nn; ^ user.cpp:13:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d, k, nn; ^ user.cpp:10:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carti3.in","r",stdin); ^ user.cpp:11:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carti3.out","w",stdout); ^ user.cpp:15:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&nn,&n); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:23:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^