代码很好懂

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#include<vector>
#include<string>
#include<map>
#include <climits>

using namespace std;

int  num[205][205];
bool numi[205][205];
int main(void)
{
	int a, b;
	cin >> a >> b;

	int k = a * b;
	for(int i=0;i<a;i++)
		for (int t = 0; t < b; t++) 
		{
			cin >> num[i][t];
			numi[i][t] = true;
		}
	int x = 0, y = 0;
	
	while (k)
	{
		for (int i = y; i < a; i++)
		{
			if (!numi[i][x]) break;
			y = i;
			k--;
			numi[i][x] = false;
			k != 0 ? cout << num[i][x] << " " : cout << num[i][x];
		}
		if (!k) break;
		x++;
		for (int i = x; i < b; i++)
		{
			if (!numi[y][i]) break;
			x = i;
			k--;
			numi[y][i] = false;
			k != 0 ? cout << num[y][i] << " " : cout << num[y][i];
		}
		if (!k) break;
		y--;
		for (int i = y; i >= 0; i--)
		{
			if (!numi[i][x]) break;
			y = i;
			k--;
			numi[i][x] = false;
			k != 0 ? cout << num[i][x] << " " : cout << num[i][x];
		}
		if (!k) break;
		x--;
		for (int i = x; i >= 0; i--)
		{
			if (!numi[y][i]) break;
			x = i;		
			k--;
			numi[y][i] = false;
			k != 0 ? cout << num[y][i] << " " : cout << num[y][i];
		}
		if (!k) break;
		y++;
	}

	return 0;
}