Submission #959352

#	Time	Username	Problem	Language	Result	Execution time	Memory
959352		The_Samurai	버섯 세기 (IOI20_mushrooms)	C++17	0 / 100	6 ms	444 KiB

mushrooms

#include "mushrooms.h"
#include "bits/stdc++.h"
using namespace std;

int count_mushrooms(int n) {
	vector<int> zeros = {0};
	const int cnt = 30, b = 25;
	for (int l = 1, r = 1 + b; l < n and zeros.size() < cnt; l += b + 1, r += b + 1) {
		r = min(r, n - 1);
		vector<int> v = {0};
		for (int i = l; i <= r; i++) v.emplace_back(i);
		int x = use_machine(v);
		if (x == 0) {
			for (int i = l; i <= r; i++) v.emplace_back(i);
			continue;
		}
		if (x == 1) {
			if (use_machine({0, l})) continue;
		}
		for (int i = l; i <= r; i++) {
			if (use_machine({0, i}) == 0) zeros.emplace_back(i);
		}
	}
	if (zeros.size() < cnt) return zeros.size();
	vector<int> unused;
	for (int i = zeros.back() + 1; i < n; i++) unused.emplace_back(i);
	int ans = zeros.size();
	while (!unused.empty()) {
		int ln = min(unused.size(), zeros.size());
		vector<int> v;
		for (int i = 0; i < ln; i++) {
			v.emplace_back(zeros[i]);
			v.emplace_back(unused.back());
			unused.pop_back();
		}
		ans += ln - (use_machine(v) + 1) / 2;
	}
	return ans;
}

// 0 -> 3
// 2 -

• Subtask 1: 0 / 100