foo.cc: In function 'int main()':
foo.cc:8:16: warning: unused variable 'maxindex' [-Wunused-variable]
    8 |  int a[N][N],n,maxindex=0,minindex=0,i,j,flag=0,k,max=0;
      |                ^~~~~~~~
foo.cc:8:27: warning: unused variable 'minindex' [-Wunused-variable]
    8 |  int a[N][N],n,maxindex=0,minindex=0,i,j,flag=0,k,max=0;
      |                           ^~~~~~~~
foo.cc:8:49: warning: unused variable 'k' [-Wunused-variable]
    8 |  int a[N][N],n,maxindex=0,minindex=0,i,j,flag=0,k,max=0;
      |                                                 ^
foo.cc:8:51: warning: unused variable 'max' [-Wunused-variable]
    8 |  int a[N][N],n,maxindex=0,minindex=0,i,j,flag=0,k,max=0;
      |                                                   ^~~

[Hydro](https://hydro.ac)提供评测服务