【例题 6-11 UVA-297】Quadtrees

【链接】 我是链接,点我呀:)
【题意】

在这里输入题意

【题解】

发现根本不用存节点信息。 遇到了叶子节点且为黑色,就直接覆盖矩阵就好(因为是并集);

【代码】

#include <bits/stdc++.h>
using namespace std;

const int N = (1 << 5) + 10;

string s;
int pos, bo[N][N];

void fugai(int x1, int y1, int x2, int y2) {
	for (int i = x1; i <= x2; i++)
		for (int j = y1; j <= y2; j++)
			bo[i][j] = 1;
}

void dfs(int x1, int y1, int x2, int y2) {
	if (s[pos] == 'f' || s[pos] == 'e') {
		if (s[pos] == 'f') {
			fugai(x1, y1, x2, y2);
		}
		return;
	}
	int len = (x2 - x1 + 1) / 2;
	pos++;
	dfs(x1, y1 + len, x1 + len - 1, y1 + len + len - 1);
	pos++;
	dfs(x1, y1, x1 + len - 1, y1 + len - 1);
	pos++;
	dfs(x1 + len, y1, x1 + len + len - 1, y1 + len - 1);
	pos++;
	dfs(x1 + len, y1 + len, x1 + len + len - 1, y1 + len + len - 1);
}

int main() {
	//freopen("rush.txt", "r", stdin);
	int T;
	scanf("%d", &T);
	while (T--) {
		memset(bo, 0, sizeof bo);
		cin >> s;
		pos = 0;
		dfs(1, 1, 32, 32);
		cin >> s;
		pos = 0;
		dfs(1, 1, 32, 32);
		int cnt = 0;
		for (int i = 1; i <= 32; i++)
			for (int j = 1; j <= 32; j++)
				cnt += bo[i][j];
		printf("There are %d black pixels.
", cnt);
	}
	return 0;
}