CCF 201912-2 回收站选址

#include <cstring>
#include <string.h>
#include <iostream>
#include <stdio.h>
#include <unordered_map>
#include <map>
#define ll long long
#define PII pair<int, int>
using namespace std;
#define TLE ios::sync_with_stdio(0),cin.tie(0)
const int INF = 0x3f3f3f3f;
#define mod 1000000007
int main() {
	TLE;
	PII a[1005];
	int n;
	cin >> n;
	map<PII, int> mp;
	for (int i = 0; i < n; i++) {
		double xt, yt;
		cin >> xt >> yt;
		if (xt == (int)xt && yt == (int)yt) a[i] = make_pair((int)xt, (int)yt);
		mp[make_pair(a[i].first, a[i].second)] = 1;
	}
	int ans[5] = { 0 }, f1[4] = { 0,1,0,-1 }, f2[4] = { 1,0,-1,0 };
	int F1[4] = { 1,-1,1,-1 }, F2[4] = { 1,-1,-1,1 };
	for (int i = 0; i < n; i++) {
		PII t = a[i]; int flag = 1;
		for (int j = 0; j < 4; j++)
			if (!mp[make_pair(a[i].first + f1[j], a[i].second + f2[j])])
				flag = 0;
		if (flag) {
			int temp = 0;
			for (int j = 0; j < 4; j++)
				if (mp[make_pair(a[i].first + F1[j], a[i].second + F2[j])])
					temp++;
			ans[temp]++;
		}
	}
	for (int i = 0; i < 5; i++)
		cout << ans[i] << endl;
}

本文地址：https://blog.csdn.net/weixin_45919985/article/details/108150729