/in/foo.cc: In function 'int main()':
/in/foo.cc:11:6: warning: unused variable 't' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N],c[N];
      ^
/in/foo.cc:11:12: warning: unused variable 'n' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N],c[N];
            ^
/in/foo.cc:11:14: warning: unused variable 'sum' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N],c[N];
              ^~~
/in/foo.cc:11:32: warning: unused variable 'c' [-Wunused-variable]
  int t,i,j,n,sum,max,a[N],b[N],c[N];
                                ^