Submission #1090731

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090731		onlk97	Counting Mushrooms (IOI20_mushrooms)	C++14	80.43 / 100	7 ms	972 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
int count_mushrooms(int n){
    vector <int> a,b;
    a.push_back(0);
    int ans=1,ptr=1;
    while (ptr<n){
        if (a.size()>=b.size()){
            int s=max(0,min((int)a.size(),n-ptr-1)-1);
            vector <int> ask;
            for (int i=0; i<s; i++){
                ask.push_back(a[i]);
                ask.push_back(ptr); ptr++;
            }
            ask.push_back(a[s]);
            ask.push_back(ptr); ptr++;
            int ret=use_machine(ask);
            ans+=(ask.size()-ret)/2;
            if (ret%2==0) a.push_back(ptr-1);
            else b.push_back(ptr-1);
        } else {
            int s=max(0,min((int)b.size(),n-ptr-1)-1);
            vector <int> ask;
            for (int i=0; i<s; i++){
                ask.push_back(b[i]);
                ask.push_back(ptr); ptr++;
            }
            ask.push_back(b[s]);
            ask.push_back(ptr); ptr++;
            int ret=use_machine(ask);
            ans+=(ret+1)/2;
            if (ret%2==1) a.push_back(ptr-1);
            else b.push_back(ptr-1);
        }
    }
    return ans;
}

• Subtask 1: 80.427 / 100