Compilare: user.cpp: In function ‘int main()’: user.cpp:6:32: warning: unused variable ‘k’ [-Wunused-variable] int n,a,b,i,pa,pb,cate=0,d,k=0,nr; ^ user.cpp:6:36: warning: unused variable ‘nr’ [-Wunused-variable] int n,a,b,i,pa,pb,cate=0,d,k=0,nr; ^ user.cpp:7:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teams.in","r",stdin); ^ user.cpp:8:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teams.out","w",stdout); ^ user.cpp:9:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&a,&b); ^ user.cpp:11:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^