2017年鹅场模拟笔试之蛇型矩阵

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题目大意：输入一个正数n，按顺时针方向打印n * n的蛇型矩阵。

输入：

6

输出：

1    2   3  4   5  6
20 21 22 23 24 7
19 32 33 34 25 8
18 31 36 35 26 9
17 30 29 28 27 10
16 15 14 13 12 11

代码如下 

#include <stdio.h>
#include <stdlib.h>

void snakeArr(int **arr,int n)
{
    int val,i,j,left,right,low,high;

    left = low = 0;
    right = high = n -1;
    val = 0;  
    while(left <= right && low <= high){
        for(i = left; i <= right; i++){
            arr[low][i] = ++val;
        }
        for(i = low + 1; i <= high; i++){
            arr[i][right] = ++val;
        }
        for(i = right - 1; i >= left; i--){
            arr[high][i] = ++val;
        }
        for(i = high - 1; i > low; i--){
            arr[i][left] = ++val;
        }

        low++;left++;high--;right--;
    }
    printf("蛇型矩阵
");
    for(i = 0; i < n; i++){
        for(j = 0; j < n; j++)
            printf("%5d ",arr[i][j]);
        printf("
");
    }
}
int main()
{
    int **arr,i,n;
    scanf("%d",&n);
    arr = (int **)malloc(sizeof(int) * n);
    for(i = 0; i < n; i++)
        arr[i] = (int *)malloc(sizeof(int) * n);
    snakeArr(arr,n);
    system("pause");
    return 0;
}