sdnu1506 D.Swiss-system tournament（归并排序）

D.Swiss-system tournament

Description

A Swiss-system tournament is a tournament which uses a non-elimination format. The first tournament of this type was a chess tournament in Zurich in 1895, hence the name "Swiss system". The tournament will be held based on following rules.

2*N contestants (indexed 1, 2, ..., 2*N) will have R rounds matches. Before the first round, every contestant has an origin score. After every match, winner will get 1 score and loser will get 0 score. Before and after every round, contestants will be sorted by their scores in descending order. Two contestants with the same score will be sorted by their index with ascending order.

In every round, contestants will have match based on the sorted list. The first place versus the second place, the third place versus the forth place, ..., the Kth place versus the (K + 1)th place, ..., the (2*N - 1)th place versus (2*N)th place.

Now given the origin score and the ability of every contestant, we want to know the index of the Qth place contestant. We ensured that there won’t be two contestants with the same ability and the contestant with higher ability will always win the match.

Input

Multiple test cases. The first line contains a positive integer T (T<=10) indicating the number of test cases.

For each test case, the first line contains three positive integers N (N <= 100,000), R (R <= 50), Q (Q <= 2*N), separated by space.

The second line contains 2*N non-negative integers, s1, s2, ..., s2*N, si (si<= 100000000) indicates the origin score of constant indexed i.

The third line contains 2*N positive integers, a1, a2, ..., a2*N, ai (ai<= 100000000) indicates the ability of constant indexed i.

Output

One line per case, an integer indicates the index of the Qth place contestant after R round matches.

Sample Input

2 4 2

7 6 6 7

10 5 20 15

Sample Output

2n个人进行比赛，给出每人的ability&&origin score；每次比赛前后注意是前后都会根据目前的分数进行降序排列；比赛时，根据名单，第一名vs第二名第三名vs第四名……第2n-1名vs第2n名。

问r场比赛之后排名为q的人的id

不难想到结构体排序于是我理所当然地sort了一遍果不其然地T了hhhhh

数据范围是1e5 应该用归并排序（挺好orz）

#include <bits/stdc++.h>
using namespace std;
const int N=100005;
struct peo
{
    int sc,ab;
    int num;
}s[2*N],a[N],b[N];
bool cmp(peo x,peo y)
{
    if(x.sc!=y.sc)
        return x.sc>y.sc;
    else if(x.sc==y.sc)
        return x.num<y.num;
}
void solve(int n)
{
    int cnt1=0,cnt2=0;
    for(int i=0;i<n;i+=2)
    {
        if(s[i].ab>s[i+1].ab)///分为两类 胜和败 依次更新score
        {
            a[cnt1]=s[i];
            a[cnt1].sc++;
            cnt1++;
            b[cnt2++]=s[i+1];
        }
        else
        {
            a[cnt1]=s[i+1];
            a[cnt1].sc++;
            cnt1++;
            b[cnt2++]=s[i];
        }
    }
    int cnt=0;
    int i=0,j=0;
    while(i<cnt1&&j<cnt2)///依次比较获胜的人与战败的人的score 更新名单
    {
        if(a[i].sc>b[j].sc||(a[i].sc==b[j].sc&&a[i].num<b[j].num))
            s[cnt++]=a[i++];
        else
            s[cnt++]=b[j++];
    }
    while(i<cnt1)
        s[cnt++]=a[i++];
    while(j<cnt2)
        s[cnt++]=b[j++];
}
int main()
{
    int t,n,r,q;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%d%d",&n,&r,&q);
        memset(s,0,sizeof(s));
        for(int i=0;i<2*n;i++)
        {
            scanf("%d",&s[i].sc);
            s[i].num=i+1;
        }
        for(int i=0;i<2*n;i++)
            scanf("%d",&s[i].ab);
        sort(s,s+2*n,cmp);
        while(r--)
            solve(2*n);
        cout<<s[q-1].num<<'\n';
    }
    return 0;
}