Submission #1057422

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057422		c2zi6	Counting Mushrooms (IOI20_mushrooms)	C++14	80.43 / 100	7 ms	852 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) {
    int max0 = n, max1 = n;

    VI qr;
    rep(i, n) qr.pb(i);
    int ret = use_machine(qr);
    int min0 = (ret+2)/2;
    int min1 = (ret+1)/2;
    setmin(max0, n - min1);
    setmin(max1, n - min0);

    VI mek, zro;
    zro.pb(0);
    int ans = 1;
    int 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()) {
            ans += urish;
            if (ret & 1) zro.pb(last-1);
            else mek.pb(last-1);
        } else {
            ans += qr.size()/2 - urish;
            if (ret & 1) mek.pb(last-1);
            else zro.pb(last-1);
        }
    }
    return ans;
}

• Subtask 1: 80.427 / 100