基础练习 回形取数

#include <cstdio>
#include <vector>
#include <cstring>
#include <iostream>
using namespace std;

int main()
{
	//freopen("input2(1).txt", "r", stdin);
	int m, n;
	int i, j, num = 0;
	int a[205][205];
	memset(a, -1, sizeof(a));
	scanf("%d%d", &m, &n);
	for(i = 0; i < m; i++)
		for(j = 0; j < n; j++)
			scanf("%d", &a[i][j]);
	int tot = 0, x = -1, y = 0;
	while(tot < m * n)
	{
		while(x + 1 < m && a[x + 1][y] != -1)
		{
			printf("%d ", a[++x][y]);
			a[x][y] = -1;
			++tot;
		}
		while(y + 1 < n && a[x][y + 1] != -1)
		{
			printf("%d ", a[x][++y]);
			a[x][y] = -1;
			++tot;
		}
		while(x - 1 >= 0 && a[x - 1][y] != -1)
		{
			printf("%d ", a[--x][y]);
			a[x][y] = -1;
			++tot;
		}
		while(y - 1 >= 0 && a[x][y - 1] != -1)
		{
			printf("%d ", a[x][--y]);
			a[x][y] = -1;
			++tot;
		}
	}
	return 0;
}