Submission #225908

#	Time	Username	Problem	Language	Result	Execution time	Memory
225908		pavement	Lost in the cycle (IOI19_cycle)	C++17	100 / 100	5 ms	384 KiB

cycle

#include "cycle.h"
#include <bits/stdc++.h>
using namespace std;

void escape(int n) {
	if (n == 2) {
		jump(1);
		return;
	}
	int cur = 0, lo = 0, hi = n / 2, ans = -1;
	if (jump(n - 1)) {
		if (!jump(1)) {
			jump(n - 1);
			return;
		}
		while (lo <= hi) {
			int mid = (lo + hi) >> 1;
			bool x = jump(mid <= cur ? cur - mid : n - llabs(cur - mid));
			cur = mid;
			if (x) ans = mid, lo = mid + 1;
			else hi = mid - 1;
		}
		jump((ans <= cur ? cur - ans : n - llabs(cur - ans)) + n / 2);
	} else {
		jump(1);
		while (lo <= hi) {
			int mid = (lo + hi) >> 1;
			bool x = jump(mid >= cur ? mid - cur : n - cur + mid);
			cur = mid;
			if (x) ans = mid, hi = mid - 1;
			else lo = mid + 1;
		}
		jump((ans >= cur ? ans - cur : n - cur + ans) + n / 2);
	}
}

• Subtask 1: 11 / 11
• Subtask 2: 33 / 33
• Subtask 3: 56 / 56