Submission #937287

#	Time	Username	Problem	Language	Result	Execution time	Memory
937287		snpmrnhlol	The Big Prize (IOI17_prize)	C++17	100 / 100	33 ms	600 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int K = 500;
const int L = 5000;
const int mod = 998244353;
set <int> s;
int cnt = 0;
int mx = 0;
int qcount = 0;
int ans = -1;
int seed = 17;
int f(){
    return rng()%mod;
    seed = 1ll*seed*seed%mod;
    return seed;
}
void solve(int l,int r,int dl,int dr){
    if(dl + dr >= mx)return;
    if(l > r)return;
    int mij = (l + r)/2;
    for(int i = mij;i <= r;i++){
        auto x = ask(i);
        if(x[0] + x[1] == mx){
            x[0]-=dl;
            x[1]-=dr;
            solve(i + 1,r,x[0] + dl,dr);
            if(ans != -1)return;
            solve(l,mij - 1,dl,dr + x[1] + i - mij);
            return;
        }else{
            if(x[0] + x[1] == 0){
                ans = i;
                return;
            }
        }
    }
    solve(l,mij - 1,dl,dr);
    return;
}
int find_best(int n) {
    for(int i = 0;i < K;i++){
        int id = f()%n;
        //cout<<id<<'\n';
        auto x = ask(id);
        int nr = x[0] + x[1];
        if(nr == 0)return id;
        if(nr > mx){
            mx = nr;
            cnt = 1;
        }else if(nr == mx){
            cnt++;
        }
        if(mx > (int)sqrt(n)){
            break;
        }
    }
    solve(0,n - 1,0,0);
	return ans;
}
/**
8
3 3 3 3 2 2 2 1
**/

• Subtask 1: 20 / 20
• Subtask 2: 80 / 80