Compilare: user.cpp: In function ‘int main()’: user.cpp:27:9: warning: unused variable ‘t’ [-Wunused-variable] int t,n,sum,i,k,a,b,c; ^ user.cpp:27:13: warning: unused variable ‘sum’ [-Wunused-variable] int t,n,sum,i,k,a,b,c; ^ user.cpp:27:19: warning: unused variable ‘k’ [-Wunused-variable] int t,n,sum,i,k,a,b,c; ^ user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.in","r",stdin); ^ user.cpp:26:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.out","w",stdout); ^ user.cpp:28:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&a,&b,&c); ^