제출 #295557

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
295557		mode149256	커다란 상품 (IOI17_prize)	C++14	91.48 / 100	68 ms	384 KiB

prize

#include <bits/stdc++.h>
#include "prize.h"
using namespace std;
using vi = vector<int>;
int N;

int lol = 0;

int isLol(vi a) {
	return a[0] + a[1] == lol;
}

int get(int l, int r, int kiek, int kair, int des) {
	// int sqr = (int)sqrt(r - l + 1);
	// printf("l = %d, r = %d, kiek = %d\n", l, r, kiek);
	int m = (l + r) / 2;

	if (kiek <= 0) return -1;
	if (l > r) return -1;

	// int st = max(l, m - kiek / 2 - 5);

	// ieskom did des [1]

	vi viso(2, 0);
	int ind = -1;

	vi ans = ask(m);

	if (ans[0] == ans[1] and ans[0] == 0)
		return m;

	if (isLol(ans)) {
		ind = m;
		viso = ans;
	}

	for (int i = 1; ind == -1 and (l <= (m - i) or (m + i) <= r); ++i)
	{
		if (l <= (m - i)) {
			ans = ask(m - i);
			if (ans[0] == ans[1] and ans[0] == 0)
				return m - i;

			if (isLol(ans)) {
				ind = m - i;
				viso = ans;
			}
		}
		if ((m + i) <= r) {
			ans = ask(m + i);
			if (ans[0] == ans[1] and ans[0] == 0)
				return m + i;

			if (isLol(ans)) {
				ind = m + i;
				viso = ans;
			}
		}
	}

	// printf("l = %d, r = %d, kiek = %d, ind = %d, viso = %d %d, kair = %d, des = %d\n",
	// l, r, kiek, ind, viso[0], viso[1], kair, des);
	if (ind == -1) return -1;
	// ind is lol

	int left = get(l, ind - 1, viso[0] - kair, kair, viso[1]);
	int right = get(ind + 1, r, viso[1] - des, viso[0], des);
	if (left != -1) return left;
	else if (right != -1) return right;
	else return -1;
}

int find_best(int n) {
	N = n;
	// if (n <= 5000) {
	// 	for (int i = 0; i < n; ++i)
	// 	{
	// 		vi ans = ask(i);
	// 		if (ans[0] == ans[1] and ans[0] == 0)
	// 			return i;
	// 	}
	// }

	vi viso(2, 0);
	int ind = 0;

	for (int i = 0; i < 475; ++i) {
		vi ans = ask(i);
		if (ans[0] == ans[1] and ans[0] == 0)
			return i;
		if (ans[0] + ans[1] >= viso[0] + viso[1]) {
			ind = i;
			viso = ans;
		}
	}

	lol = viso[0] + viso[1];

	return get(ind + 1, n - 1, viso[1], viso[0], 0);
}

• Subtask 1: 20 / 20
• Subtask 2: 71.48 / 80