Submission #434811

#	Time	Username	Problem	Language	Result	Execution time	Memory
434811		dutch	The Big Prize (IOI17_prize)	C++17	100 / 100	58 ms	328 KiB

prize

#include <bits/stdc++.h>
using namespace std;
#include "prize.h"
 
int ans, val;
 
void search(int l, int r, int lx, int rx){
	if(l > r || ans >= 0 || lx + rx == val) return;
	int m1 = (l + r) / 2, m2 = m1 + 1, x, y, cnt = 0;
	vector<int> q = {0, 0};
	while(1){
		if((y = m1-l > r-m2)) x = m1--;
		else x = m2++;
 
		q = ask(x);
		if(q[0] + q[1] == 0) return void(ans = x);
		if(q[0] + q[1] < val) ++cnt;
		else break;
 
		if(cnt == val - lx - rx) return;
	}
 
	q[!y] += cnt;
 
	search(l, m1, lx, q[1]);
	search(m2, r, q[0], rx);
}
 
int find_best(int n){
  	ans = val = -1;
	for(int i=1; i<n; i+=i){
		vector<int> q = ask(i-1);
		val = max(val, q[0] + q[1]);
      	q = ask(n-i);
      	val = max(val, q[0] + q[1]);
	}
	search(0, n-1, 0, 0);
	return ans;
}

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