Submission #717260

#	Time	Username	Problem	Language	Result	Execution time	Memory
717260		vjudge1	Table Tennis (info1cup20_tabletennis)	C++17	87 / 100	3088 ms	161036 KiB

tabletennis

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define int long long
#define endl '\n'
using namespace std;
using namespace __gnu_pbds;
using ordered_set = tree<pair<int,int>,null_type,less<pair<int,int>>,rb_tree_tag,tree_order_statistics_node_update>;
int n,k;
void slv(deque<int>dq,int p){
    int kk=k;
    deque<int>a,b;
    while(dq.size()){
        if(dq.size()==1){
            kk--;
            break;
        }
        int f=dq.back();
        dq.pop_back();
        auto it=lower_bound(dq.begin(),dq.end(),p-f);
        if(it==dq.end()||*it!=p-f){
            kk--;
            continue;
        }else{
            while(dq.front()!=*it){
                dq.pop_front();
                kk--;
            }
            a.push_back(dq.front());
            b.push_front(f);
            dq.pop_front();
        }
    }
    if(kk==0){
        for(auto &i:a)cout<<i<<' ';
        for(auto &i:b)cout<<i<<' ';
        exit(0);
    }
}
signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>k;
    deque<int>dq(n+k);
    for(auto &i:dq)cin>>i;
    srand(543634);
    vector<pair<int,int>>v;
    if(k>20&&n>100){
        map<int,int>mp;
        for(int i=0;i<2000000;i++)mp[abs(dq[rand()%(n)]+dq[rand()%n])]++;
        for(auto &i:mp)v.push_back({i.second,i.first});
        sort(v.begin(),v.end());
        for(int i=v.size()-1;i>=0;i--){
            slv(dq,v[i].second);
        }
    }else{
        for(int i=0;i<=k;i++){
            for(int w=0;w<=k-i;w++){
                slv(dq,dq[i]+dq[dq.size()-w-1]);
            }
        }
    }
}

• Subtask 1: 11 / 11
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 9 / 9
• Subtask 6: 14 / 14
• Subtask 7: 15 / 15
• Subtask 8: 0 / 13