900ms压线AC

当时我是提交弱化版代码，没想到900ms压线过

#include<bits/stdc++.h>
#define int long long
using namespace std;
struct node{
    int score,sl,pm,id;
}a[200005];

bool cmp(node a,node b){
    if(a.score != b.score) return a.score > b.score;
    else return a.id < b.id;
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n,r,q; cin >> n >> r >> q;
    for(int i = 1;i <= n * 2;i++) cin >> a[i].score;
    for(int i = 1;i <= n * 2;i++){
        cin >> a[i].sl;
        a[i].id = i;
    }
    while(r--){
        sort(a + 1,a + n * 2 + 1,cmp);
        for(int i = 1;i <= n * 2;i += 2){
            if(a[i].sl > a[i + 1].sl) a[i].score++;
            else a[i + 1].score++;
        }
    }
    sort(a + 1,a + n * 2 + 1,cmp);
    cout << a[q].id;
    return 0;
}