Submission #718163

#	Time	Username	Problem	Language	Result	Execution time	Memory
718163		Jarif_Rahman	The Big Prize (IOI17_prize)	C++17	90 / 100	118 ms	5232 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

vector<int> asked[200000];
vector<int> Ask(int i){
    if(asked[i].empty()) asked[i] = ask(i);
    return asked[i];
}

int ans = -1, mx = 0;

int Ask_cnt(int i){
    auto v = Ask(i);
    if(v[0]+v[1] == 0) ans = i;
    return v[0]+v[1];
}

void solve(int l, int r){
    if(ans != -1) return;
    while(Ask_cnt(l) < mx && l <= r) l++;
    if(ans != -1) return;
    while(Ask_cnt(r) < mx && r >= l) r--;
    if(ans != -1) return;

    if(l >= r) return;

    auto a = Ask(l), b = Ask(r);
    if(a[0] == b[0] && a[1] == b[1]) return;
    int md = (l+r)/2;
    solve(l, md);
    solve(md+1, r);
}

int find_best(int n){
    for(int i = 0; i < min(n, 480); i++){
        auto v = Ask(i);
        mx = max(mx, v[0]+v[1]);
    }
    solve(0, n-1);
    return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80