Submission #1238122

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238122		vivkostov	The Big Prize (IOI17_prize)	C++20	20 / 100	23 ms	412 KiB

prize

//#include "grader.cpp"
#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
mt19937 mt(time(nullptr));
int sum,lamp,n;
vector<int>a;
void prec()
{
   for(int i=1;i<=5;i++)
   {
       a=(ask(mt()%n));
       sum=max(sum,a[0]+a[1]);
   }
}
void rec(int l,int r,int br)
{
    if(lamp||!br)return;
    if(r-l+1==br)
    {
        for(int i=l;i<=r;i++)
        {
            a=ask(i);
            if(a[0]+a[1]==0)
            {
                lamp=i+1;
                break;
            }
            if(a[1]==0)break;
        }
        return;
    }
    int mid=(l+r)/2;
    a=ask(mid);
    if(a[0]+a[1]==0)
    {
        lamp=mid+1;
        return;
    }
    rec(l,mid-1,a[0]);
    rec(mid+1,r,a[1]);
}
int find_best(int N)
{
    n=N;
    prec();
    rec(1,n,sum);
	return lamp-1;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80