foo.cc: In function 'int main()':
foo.cc:11:6: warning: unused variable 't' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N];
      ^
foo.cc:11:12: warning: unused variable 'n' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N];
            ^
foo.cc:11:14: warning: unused variable 'sum' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N];
              ^~~
foo.cc:11:18: warning: unused variable 'max' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N];
                  ^~~

[Hydro](https://hydro.ac)提供评测服务