Submission #613749

#	Time	Username	Problem	Language	Result	Execution time	Memory
613749		Jarif_Rahman	Counting Mushrooms (IOI20_mushrooms)	C++17	67.06 / 100	11 ms	344 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

const int  k = 94;

int count_mushrooms(int n){
    if(n <= 227){
        int ans = 1;
        for(int i = 1; i < n; i++) if(!use_machine({0, i})) ans++;
        return ans;
    }

    vector<int> A, B;
    A.pb(0);

    int ls = n, ans;

    for(int i = 1; i < n; i++){
        if(use_machine({0, i})) B.pb(i);
        else A.pb(i);

        if(max(A.size(), B.size()) == k){
            ls = i+1;
            break;
        }
    }

    ans = A.size();
    
    while(ls < n){
        if(A.size() > B.size()){
            int sz = A.size();
            vector<int> Q;
            for(int i = 0; i < sz; i++){
                Q.pb(A[i]);
                if(ls+i < min(n, ls+sz)) Q.pb(ls+i);
            }
            int x = use_machine(Q);
            ans+=min(n, ls+sz)-ls-x%2-x/2;
            if(x%2) B.pb(ls+sz-1);
            else A.pb(ls+sz-1);
            ls+=sz;
        }
        else{
            int sz = B.size();
            vector<int> Q;
            for(int i = 0; i < sz; i++){
                Q.pb(B[i]);
                if(ls+i < min(n, ls+sz)) Q.pb(ls+i);
            }
            int x = use_machine(Q);
            ans+=x%2+x/2;
            if(x%2) A.pb(ls+sz-1);
            else B.pb(ls+sz-1);
            ls+=sz;
        }
    }

    return ans;
}

• Subtask 1: 67.0623 / 100