【Codeforces 493C】Vasya and Basketball

【链接】 我是链接,点我呀:)
【题意】

题意

【题解】

枚举三分线(离散后)的位置 然后根据预处理的前缀和,快速算出两个队伍的分数。

【代码】

#include <bits/stdc++.h>
using namespace std;
const int N = 2e5;

int n,m;
int a[N+10],b[N+10],aa[2*N+100],bb[2*N+100];
map<int,int> dic;
map<int,int> dic2;

int main(){
    ios::sync_with_stdio(0),cin.tie(0);
    cin >> n;
    for (int i = 1;i <= n;i++) {
            cin >> a[i];
            dic[a[i]] = 1;
    }
    cin >> m;
    for (int i = 1;i <= m;i++) {
        cin >> b[i];
        dic[b[i]] = 1;
    }
    map<int,int>::iterator it;
    int cnt = 0;
    dic2[0] = ++cnt;
    for (it = dic.begin();it!=dic.end();it++) {

            dic2[(*it).first] = ++cnt;
    }
    for (int i = 1;i <= n;i++){
        aa[dic2[a[i]]]++;
    }

    for (int i = 1;i <= m;i++){
        bb[dic2[b[i]]]++;
    }
    for (int i = 1;i <= cnt;i++) aa[i]+=aa[i-1];
    for (int i = 1;i <= cnt;i++) bb[i]+=bb[i-1];
    int ans = -(1e8),maxa;
    for (int i = 1;i <= cnt;i++){
        int ga = aa[i]*2+(n-aa[i])*3;
        int gb = bb[i]*2+(m-bb[i])*3;
        if (ga-gb>ans){
            ans = ga-gb;
            maxa = ga;
        }else if (ga-gb==ans){
            if (maxa<ga){
                maxa = ga;
            }
        }
    }
    cout<<maxa<<":"<<maxa-ans<<endl;

	return 0;
}