Compilare: user.cpp: In function ‘int main()’: user.cpp:43:9: warning: unused variable ‘t’ [-Wunused-variable] int t,n,c,sum,i,k; ^ user.cpp:43:13: warning: unused variable ‘c’ [-Wunused-variable] int t,n,c,sum,i,k; ^ user.cpp:43:15: warning: unused variable ‘sum’ [-Wunused-variable] int t,n,c,sum,i,k; ^ user.cpp:43:21: warning: unused variable ‘k’ [-Wunused-variable] int t,n,c,sum,i,k; ^ user.cpp:41:36: 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:42:38: 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); ^ user.cpp:44:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&n); ^ user.cpp:46:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^