Submission #1056781

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056781		phoenix	The Big Prize (IOI17_prize)	C++17	90 / 100	49 ms	5916 KiB

prize

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

using namespace std;

const int N = 200200;
const int B = 450;

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, B); i++) {
		if (!sum(i)) return i;
		val = max(val, sum(i));
	}
	int cnt = 0;
	for (int i = 0; i < B; i++) 
		cnt += (sum(i) < val);
	
	for (int it = B; it < n; it += B) {
		int rb = min(it + B, n);
		if (sum(rb-1) == val && arr[rb-1][0] == cnt) 
			continue;

		int i = it;
		while (i < rb) {
			while (i < rb && sum(i) < val) {
				if (!sum(i))
					return i;
				i++;
				cnt++;
			}
			int l = i, r = rb;
			while (r - l > 1) {
				int mid = (l + r) / 2;
				if (ASK(mid) == ASK(i)) 
					l = mid;
				else {
					if (!sum(mid))
						return mid;
					r = mid;
				}
			}
			i = r;
		}
	}
	return 0;
}

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