样例描述：

 代码如下：

#include<stdio.h>
int main()
{int N,n,a[51][51],r,c,i,num1,num2,num3,num4;scanf("%d",&N);n=N*N;for(r=1;r<=N;r++){for(c=1;c<=N;c++)scanf("%d",&a[r][c]);}for(r=1;r<=N;r++){num1=0;for(c=1;c<=N;c++){num1+=a[r][c];}printf("%d ",num1);}printf("\n");for(c=1;c<=N;c++){num2=0;for(r=1;r<=N;r++){num2+=a[r][c];}printf("%d ",num2);}printf("\n");num3=0;for(i=1;i<=N;i++){num3+=a[i][i];}printf("%d",num3);printf("\n");num4=0;c=N;for(r=1;r<=N;r++){num4+=a[r][c];c-=1;}printf("%d",num4);return 0;
}