Submission #320382

#	Time	Username	Problem	Language	Result	Execution time	Memory
320382		egod1537	Cave (IOI13_cave)	C++14	0 / 100	140 ms	612 KiB

cave

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

using namespace std;

bitset<5001> vit;

void exploreCave(int n) {
	int* arr = new int[n];
	int* cnt = new int[n];

	function<void(int, int)> rev = [&](int s, int e) -> void {
		for (int i = s; i <= e; i++) {
			if (vit[i]) continue;
			arr[i] = (arr[i] == 1) ? 0 : 1;
		}
	};

	for (int i = 0; i < n; i++) {
		int pos = 0;

		int k = tryCombination(arr);
		int lo = 0, hi = n - 1;
		while (lo <= hi) {
			int mid = (lo + hi) / 2;

			rev(lo, mid);
			int w = tryCombination(arr);
			
			//이미 문이 열려있음
			if (k > i) {
				if (w == i) hi = mid - 1;
				else lo = mid + 1;
			}
			//이미 문이 닫혀있을 때
			else {
				if (w > i) hi = mid - 1;
				else lo = mid + 1;
			}

			rev(lo, mid);
		}

		if (k <= i) arr[pos] = (arr[pos] == 1) ? 0 : 1;
		
		cnt[i] = pos;
		vit[pos] = true;
	}

	answer(arr, cnt);
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24