201912-2回收站选址

题目描述

代码

#include <bits/stdc++.h>
using namespace std;
int main(){
	int n, direct[8][2] = {{1, 0}, {0, 1}, {-1, 0}, {0, -1},
						   {1, 1}, {1, -1}, {-1, 1}, {-1, -1}}, a[5];
	set<pair<int, int>> garbage;
	memset(a, 0, sizeof(a));
	cin >> n;
	for(int i = 0; i < n; i++){
		int x, y;
		cin >> x >> y;
		pair<int, int> p(x, y);
		garbage.insert(p);
	}
	for(auto it = garbage.begin(); it != garbage.end(); it++){
		int flag = 1;
		for(int i = 0; i < 4; i++){
			pair<int, int> tmp(it->first + direct[i][0], it->second + direct[i][1]);
			if(garbage.find(tmp) == garbage.end()){
				flag = 0;
				break;
			}
		}
		if(flag == 1){
			flag = 0;
			for(int i = 4; i < 8; i++){
				pair<int, int> tmp(it->first + direct[i][0], it->second + direct[i][1]);
				if(garbage.find(tmp) != garbage.end())
					flag++;
			}
			a[flag]++;
		}
	}
	for(int i = 0; i < 5; i++)
		cout << a[i] << '\n';
	return 0;
}
/*
7
1 2
2 1
0 0
1 1
1 0
2 0
0 1
*/

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标签：tmp,garbage,int,direct,++,flag,201912,选址,回收站
来源： https://blog.csdn.net/weixin_51621643/article/details/120579462