编程开发蛇形图案求解

题目简介

输出蛇形图案，如：
1 2 3
8 9 4
7 6 5

说明

直接模拟，用控制方向的常量数组简化程序。

#include 
#include 
#include 

int n, x, y, num[11][11];

bool inside(int x, int y)
{
    if (1 <= x && x <= n && 1 <= y && y <= n && num[x][y] == 0) return 1;
    return 0;
}

int main()
{
    int cas, i, j, t;
    const int dx[4] = {0, 1, 0, -1};
    const int dy[4] = {1, 0, -1, 0};
    scanf("%d", &cas);
    for (t = 0; t < cas; ++t){
        scanf("%d", &n);
        memset(num, 0, sizeof(num));
        int now = 0, dir = 0;
        x = 1;y = 1;
        for (i = 1; i <= n * n; ++i){
            num[x][y] = ++now;
            if (now == n * n) break;
            int x1 = x + dx[dir], y1 = y + dy[dir];
            while (!inside(x1, y1)){
                dir = (dir + 1) % 4;
                x1 = x + dx[dir];
                y1 = y + dy[dir];
            }
            x = x1; y = y1;
        }
        printf("case #%d:\n", t);
        for (i = 1; i <= n; ++i){
            printf("%d", num[i][1]);
            for (j = 2; j <= n; ++j) printf(" %d", num[i][j]);
            printf("\n");
        }
    }
    return 0;
}