Submission #1035347

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035347		Mr_Husanboy	Counting Mushrooms (IOI20_mushrooms)	C++17	25 / 100	79 ms	596 KiB

mushrooms

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

using namespace std;

#define ll long long
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second

template<typename T>
int len(T &a){return a.size();}

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());


int count_mushrooms(int n) {
	if(n < 5){
		int ans = 1;
		for(int i = 1; i < n; i ++){
			ans += use_machine({0, i}) ^ 1;
		}
		return ans;
	}
	vector<int> a = {0}, b;
	for(int i = 1; i < 3; i ++){
		if(use_machine({0, i})){
			b.push_back(i);
		}else a.push_back(i);
	}
	int ans = len(a);
	if(len(a) >= 2){
		for(int i = 3; i + 1 < n; i += 2){
			int c = use_machine({a[0], i, a[1], i + 1});
			ans += 2 - __builtin_popcount(c);
		}
	}else{
		for(int i = 3; i + 1 < n; i += 2){
			int c = use_machine({b[0], i, b[1], i + 1});
			ans += __builtin_popcount(c);
		}
	}
	if(n % 2 == 0){
		ans += use_machine({0, n - 1}) ^ 1;
	}
	return ans;
}

• Subtask 1: 25 / 100