Submission #423199

#	Time	Username	Problem	Language	Result	Execution time	Memory
423199		xyz	Counting Mushrooms (IOI20_mushrooms)	C++17	53.18 / 100	15 ms	328 KiB

mushrooms

#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;
typedef long long ll;

const int m = 140;

int count_mushrooms(int n){
    vector<int> A, B;
    A = {0};
    int go = 2 * m + 5;
    for(int i = 1; i < min(n, go); i ++){
        vector<int> ask = {0, i};
        int x = use_machine(ask);
        if(!x)
            A.push_back(i);
        else
            B.push_back(i);
    }
    int result = A.size();
    for(int i = go; i < n; i += m){
        if(A.size() >= B.size()){
            vector<int> ask = {A[0]};
            int cur = 1;
            for(int j = i; j < min(n, i + m); j ++){
                ask.push_back(j);
                ask.push_back(A[cur]);
                ++ cur;
            }
            int x = use_machine(ask), y = ask.size();
            result += ((y - 1) - x) / 2;
        }else{
            vector<int> ask = {B[0]};
            int cur = 1;
            for(int j = i; j < min(n, i + m); j ++){
                ask.push_back(j);
                ask.push_back(B[cur]);
                ++ cur;
            }
            int x = use_machine(ask);
            result += x / 2;
        }
    }
    return result;
}

• Subtask 1: 53.1765 / 100