#include<stdio.h> int main(){     int i,j,n,f=1;     int a[n][n];     scanf("%d",&n);     for(i=0;i<n;i++){           for(j=0;j<=i;j++){             if(i%2==0)                 a[j][i-j]=f++;             else                 a[i-j][j]=f++;         }         }     int num=16;...