Submission #675899

#	Time	Username	Problem	Language	Result	Execution time	Memory
675899		VodkaInTheJar	Counting Mushrooms (IOI20_mushrooms)	C++14	80.71 / 100	8 ms	468 KiB

mushrooms

#include <bits/stdc++.h>

using namespace std;

int use_machine(vector <int> x);
int count_mushrooms(int n) {
    vector <int> as;
    vector <int> bs;

    as.push_back(0);
    int pos = 1, ans = 1; 
    while (pos < n) {
        if ((int)as.size() >= (int)bs.size()) {
            int nxt = min(n, pos + (int)as.size());
            vector <int> temp;
            for (int i = pos; i < nxt; i++) {
                temp.push_back(as[i-pos]);
                temp.push_back(i);
            }

            int cnt_b = use_machine(temp);
            if (cnt_b & 1)
                bs.push_back(nxt-1), ans += (int)temp.size() / 2 - (cnt_b + 1) / 2;
            
            else 
                as.push_back(nxt-1), ans += (int)temp.size() / 2 - cnt_b / 2;
        
            pos = nxt; 
        }

        else {
            int nxt = min(n, pos + (int)bs.size());
            vector <int> temp;
            for (int i = pos; i < nxt; i++) {
                temp.push_back(bs[i-pos]);
                temp.push_back(i);
            }

            int cnt_a = use_machine(temp);
            if (cnt_a & 1)
                as.push_back(nxt-1), ans += (cnt_a + 1) / 2;
            
            else 
                bs.push_back(nxt-1), ans += cnt_a / 2;
        
            pos = nxt; 
        }
    }

    return ans;
}

• Subtask 1: 80.7143 / 100