luoguP2994[USACO10OCT]吃晚饭的时候Dinner Time

Posted 2021-03-24 yjkhhh

题目链接

按顺序对于每个座位找一个最近的同时编号最小的牛就行了

#include<iostream>
#include<cstring>
#include<cstdio>
#define int long long
using namespace std;

const int MAXN=1010;
const int INF=1e18;

int n,m;

struct Data{
    int x,y;
} c[MAXN],s[MAXN];

bool ok[MAXN],used[MAXN];

inline int dis(int i,int j){
    return (c[i].x-s[j].x)*(c[i].x-s[j].x)+(c[i].y-s[j].y)*(c[i].y-s[j].y);
}

signed main()
{
//  freopen("a.in","r",stdin);
//  freopen("a.out","w",stdout);
    scanf("%lld%lld",&n,&m);
    for(int i=1;i<=n;++i)
        scanf("%lld%lld",&c[i].x,&c[i].y);
    for(int i=1;i<=m;++i)
        scanf("%lld%lld",&s[i].x,&s[i].y);
    for(int i=1;i<=m;++i){
        int k=-1,minn=INF;
        for(int j=1;j<=n;++j)
            if(!used[j]&&dis(j,i)<minn)
                k=j,minn=dis(j,i);
        used[k]=1;
    }
    bool flag=1;
    for(int i=1;i<=n;++i)
        if(!used[i]){
            printf("%lld
",i);
            flag=0;
        }
    if(flag) puts("0");
    return 0;
}