Submission #1055385

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055385		phoenix	The Big Prize (IOI17_prize)	C++17	90 / 100	49 ms	5600 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

const int N = 200200;

vector<int> arr[N];

vector<int> ASK(int p) {
	if (arr[p].empty())
		arr[p] = ask(p);
	return arr[p];	
}

int sum(int i) {
	return ASK(i)[0] + ASK(i)[1];
}

int find_best(int n) {
	int val = sum(0);
	
	for (int i = 0; i < min(n, 480); i++) {
		if (!sum(i)) return i;
		val = max(val, sum(i));
	}
	
	int i = 480;
	while (i < n) {
		int x = sum(i);
		if (!x) 
			return i;
		
		if (x < val)
			i++;
		else {
			int l = i, r = n;
			while (r - l > 1) {
				int m = (l + r) / 2;
				if (ASK(m) == ASK(l))
					l = m;
				else {
					if (!sum(m)) 
						return m;
					r = m;
				} 
			}
			i = r;
		}
	}
	return 0;
}

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