View Code of Problem 51

#include <stdio.h> 
#include <stdlib.h> 
  
int main() 
{ 
    int n,i,j,sum=0; 
    scanf("%d",&n);                     //输入数组大小 
    int a[n+1][n+1];                    //定义数组 
    for(i=1;i<=n;i++) 
        for(j=1;j<=n;j++) 
            scanf("%d",&a[i][j]);       //循环输入数组 
    for(i=1;i<=n;i++) 
        for(j=1;j<=i;j++) 
        sum+=a[i][j];                   //循环将矩阵下三角元素相加 
    printf("%d",sum);                   //输出结果 
    return 0; 
}

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