Submission #283711

#	Time	Username	Problem	Language	Result	Execution time	Memory
283711		hank55663	The Big Prize (IOI17_prize)	C++14	90 / 100	98 ms	5380 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>
using namespace std;
vector<int> cache[200005];
vector<int> myask(int x){
	if(cache[x].empty())cache[x]=ask(x);
	return cache[x];
}
int find_best(int n) {
	int Maxnum=0;
	for(int i = 0;i<n&&i<500;i++){
		vector<int> v=myask(i);
		if(v[0]+v[1]==0)return i;
		Maxnum=max(Maxnum,v[0]+v[1]);
	}
	int l=0,r=n-1;
			int num=0;
	while(true){
		int Max=r,Min=l;
	//	printf("%d %d\n",Max,Min);
		while(Max>Min){
			int mid=(Max+Min)/2;
			vector<int> v=myask(mid);
		
			if(v[0]+v[1]==0)return mid;
			if(v[0]+v[1]!=Maxnum){
				Max=mid;
			}
			else{
				if(v[0]-num)Max=mid-1;
				else Min=mid+1;
			}
		}
		num++;
		vector<int> v=myask(Max);
		if(v[0]+v[1]==0)return Max;
	//	printf("? %d %d %d\n",v[0],v[1],num);
		l=Min+1;
	}
	/*
	int Max=n-1,Min=0;
	while(Max>Min){
		int mid=(Max+Min)/2;
		vector<int> v=ask(mid);
		if(v[0]+v[1]==0){
			return mid;
		}
		if(v[0]<v[1]){
			Min=mid+1;
		}
		else{
			Max=mid-1;
		}
	}
	return Min;*/
}

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