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灌溉|蓝桥杯

沈芏 2022-02-09 阅读 62

灌溉|蓝桥杯

https://www.lanqiao.cn/problems/551/learning/
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在这里插入图片描述

代码

#include <iostream>
using namespace std;
int dir[4][2] = { {1,0},{-1,0},{0,1},{0,-1} };
int book[101][101];
int squ[101][101];
int k,m,n;
int ans = 0;
void dfs(int x, int y,int step)
{
	if (step> k) return ;
		for (int i = 0; i < 4; i++)
		{
			int nx = x + dir[i][0];
			int ny = y + dir[i][1];
			if (nx>=1 || ny>=1 || nx<=n || ny<=m)
			book[nx][ny]++;
			dfs(nx, ny, step+1);
        }
}
int main()
{
	cin >> n >> m;
	int t,k;
	int x, y;
	cin >> t;
	while (t--)
	{
		cin >> x >> y;
		squ[x][y] = 1;
		book[x][y] = 1;
	}
	cin >> k;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			if (squ[i][j] == 1)
				dfs(i, j, 0);
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			if (book[i][j] >= 1)ans++;
	cout << ans;
	return 0;
}
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