제출 #524512

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
524512		CSQ31	The Big Prize (IOI17_prize)	C++17	0 / 100	71 ms	284 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
int lim = 0;
#define sz(a) (int)(a.size());
int solve(int l,int r){
	//cout<<l<<" "<<r<<'\n';
	if(l > r)return -1;
	int mid = (l+r)/2;
	int i,j;
	for(i=mid;i<=r;i++){
		vector<int>res = ask(i);
		if(!res[0] && !res[1])return i;
		else if(!res[1]){
			i = r;
			break;
		}
		else if(res[0] + res[1] > lim)break;
	}
	if(i == mid)j = i;
	else{
		for(j=mid;j>=l;j--){
			vector<int>res = ask(j);
			if(!res[0] && !res[1])return j;
			else if(!res[0]){
				j = l;
				break;
			}
			else if(res[0] + res[1] > lim)break;
		}
	}
	int c = solve(i+1,r);
	if(c != -1)return c;
	c = solve(l,j-1);
	return c;
}
int find_best(int n) {
	lim = 1;
	for(int i = 2;i<=n;i++){
		int c = i * i + 1;
		if(c + i + 1<=n)lim = i+1;
		else break;
	} //biggest value possible
	int ans = solve(0,n-1);
	vector<int>res = ask(ans);
	assert(ans!=-1 && !res[0] && !res[1]);
	return ans;
}

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