Submission #534716

#	Time	Username	Problem	Language	Result	Execution time	Memory
534716		benson1029	The Big Prize (IOI17_prize)	C++14	20 / 100	39 ms	512 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>
using namespace std; 

vector< pair<int,int> > v;
int sum;
int ans;

void recur(int l, int r, int lhs, int rhs) {
	if(ans!=-1) return;
	if(l>r) return;
	int mid = (l+r)/2;
	for(int i=mid; i<=r; i++) {
		vector<int> tmp = ask(i);
		if(tmp[0]+tmp[1]==0) {
			ans=i;
			return;
		}
		if(tmp[0]-lhs>0) recur(l, mid-1, lhs, tmp[1]);
		if(tmp[1]-rhs>0) recur(i+1, r, tmp[0], rhs);
		v.push_back({tmp[0]+tmp[1], i});
		return;
	}
}

int find_best(int n) {
	if(n<=5000) {
		for(int i=0; i<n; i++) {
			vector<int> tmp = ask(i);
			if(tmp[0]+tmp[1]==0) return i;
		}
	}
	sum = 0;
	for(int tmp=sqrt(sqrt(n)); tmp>=2; tmp=sqrt(tmp)) {
		sum += tmp;
	}
	sum++;
	ans = -1;
	recur(0, n-1, 0, 0);
	return ans;
}

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