Submission #435509

#	Time	Username	Problem	Language	Result	Execution time	Memory
435509		Collypso	Counting Mushrooms (IOI20_mushrooms)	C++17	0 / 100	1 ms	200 KiB

mushrooms

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
#pragma GCC optimize ("O3")
#pragma GCC optimize ("O2")
#define F first
#define S second
//#define endl '\n'
//#define int long long

using namespace std;

int use_machine(vt<int> x);

int subtask1(int n)
{
	int ans = 1;
    for(int i = 1; i < n - 1; i += 2)
    {
        int tmp = use_machine({i + 1, 0, i});
        if (tmp == 0) ans += 2;
        else if (tmp == 1) ans += 1;
    }
    if (n % 2 == 0) ans += !use_machine({0, n - 1});
    return ans;
}

const int X = 100;

int count_mushrooms(int n)
{
    //if (n <= 452) return subtask1(n);

    vt<int> zeros(1, 0);
    int q = 1, ans = 1;
    while(sz(zeros) < X)
    {
        if (use_machine({0, q}) == 0) zeros.pb(q), ans++;
        q++;
    }
    for(int i = 0, to = (n - q + X - 2) / (X - 1); i < to; i++)
    {
        vt<int> tmp(1, zeros[0]);
        for(int j = 1; q < n && j < X; q++, j++)
            tmp.pb(q), tmp.pb(zeros[j]);
        ans += sz(tmp) / 2 - use_machine(tmp) / 2;
        //cout << ans << endl;
        //for(int x : tmp) cout << x << " ";
        //cout << endl;
        //cout << use_machine(tmp) << endl;
    }
    return ans;
}

• Subtask 1: 0 / 100