Submission #1114973

#	Time	Username	Problem	Language	Result	Execution time	Memory
1114973		zsombor	Counting Mushrooms (IOI20_mushrooms)	C++17	80.14 / 100	10 ms	612 KiB

mushrooms

#include "mushrooms.h"
using namespace std;

int x, y, q, l = 3, c, ans, z = 140;
vector <vector <int>> v(2);
vector <int> u;

int count_mushrooms(int n) {
	if (n == 2) return 2 - use_machine({ 0, 1 });
	v[0].push_back(0);
	v[use_machine({ 0,1 })].push_back(1);
	v[use_machine({ 0,2 })].push_back(2);
	if (v[1].size() >= 2) x = 1;

	for (int i = 3; i < min(n - 1, 2 * z + 1); i += 2) {
		q = use_machine({ v[x][0], i, v[x][1], i + 1 });
		v[(q / 2) ^ x].push_back(i);
		v[(q % 2) ^ x].push_back(i + 1);
		l = i + 2;
	}
	if (v[1].size() > v[0].size()) y = 1;
	ans = v[0].size();

	while (l < n) {
		u = { v[y][0] };
		c = 0;
		while (l < n && c < z) {
			u.push_back(l++);
			u.push_back(v[y][++c]);
		}
		q = use_machine(u) / 2;
		ans += (y ? q : c - q);
	}
	return ans;
}

• Subtask 1: 80.1418 / 100