Submission #1057509

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057509		c2zi6	Counting Mushrooms (IOI20_mushrooms)	C++14	91.87 / 100	5 ms	700 KiB

mushrooms

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#include "mushrooms.h"

int count_mushrooms(int n) {
    VI mek, zro;
    zro.pb(0);
    int cnt0 = 1;
    int last = 1;
    if (n >= 10) {
        if (!use_machine({0, 1})) {
            zro.pb(1);
            last++;
            cnt0++;
        } else {
            mek.pb(1);
            last++;
            if (!use_machine({0, 2})) {
                zro.pb(2);
                last++;
                cnt0++;
            } else {
                mek.pb(2);
                last++;
            }
        }
        rep(_, 100) {
            if (last+1 >= n) break;
            if (mek.size() >= zro.size()) {
                int ret = use_machine({mek[0], last++, mek[1], last++});
                if (ret == 0) {
                    mek.pb(last-2);
                    mek.pb(last-1);
                } else if (ret == 1) {
                    cnt0 += 1;
                    mek.pb(last-2);
                    zro.pb(last-1);
                } else if (ret == 2) {
                    cnt0 += 1;
                    zro.pb(last-2);
                    mek.pb(last-1);
                } else {
                    cnt0 += 2;
                    zro.pb(last-2);
                    zro.pb(last-1);
                }
            } else {
                int ret = use_machine({zro[0], last++, zro[1], last++});
                if (ret == 0) {
                    cnt0 += 2;
                    zro.pb(last-2);
                    zro.pb(last-1);
                } else if (ret == 1) {
                    cnt0 += 1;
                    zro.pb(last-2);
                    mek.pb(last-1);
                } else if (ret == 2) {
                    cnt0 += 1;
                    mek.pb(last-2);
                    zro.pb(last-1);
                } else {
                    mek.pb(last-2);
                    mek.pb(last-1);
                }
            }
        }
    }
    while (last < n) {
        VI qr;
        for (int x : (mek.size() > zro.size() ? mek : zro)) {
            qr.pb(x);
            qr.pb(last++);
            if (last >= n) break;
        }
        int ret = use_machine(qr);
        int urish = (ret+1)/2;
        if (mek.size() > zro.size()) {
            cnt0 += urish;
            if (ret & 1) zro.pb(last-1);
            else mek.pb(last-1);
        } else {
            cnt0 += qr.size()/2 - urish;
            if (ret & 1) mek.pb(last-1);
            else zro.pb(last-1);
        }
    }
    return cnt0;
}

• Subtask 1: 91.8699 / 100