Submission #543696

#	Time	Username	Problem	Language	Result	Execution time	Memory
543696		nayhz	Cave (IOI13_cave)	C++17	100 / 100	245 ms	536 KiB

cave

#include "cave.h"

#include <bits/stdc++.h>
#define ll long long
using namespace std;

int s[5005]; // switch
int ans[5005];

void exploreCave(int n) {
	memset(ans, -1, sizeof(ans));

	ll l, r, mid;
	bool flag, idk;
	for (int i = 0; i < n; i++) {
		l = 0, r = n - 1;
		flag = (tryCombination(s) == i);

		while (l <= r) {
			mid = (l + r) / 2;

			for (int j = l; j <= mid; j++) if (ans[j] == -1) s[j] = 1;

			idk = (tryCombination(s) == i);

			for (int j = l; j <= mid; j++) if (ans[j] == -1) s[j] = 0;

			if (flag == idk) l = mid + 1;
			else r = mid - 1;
		}
		ans[l] = i, s[l] = flag;
	}

	answer(s, ans);
}

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