Submission #1104036

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104036		vjudge1	Counting Mushrooms (IOI20_mushrooms)	C++14	0 / 100	7 ms	592 KiB

mushrooms

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

int count_mushrooms(int n){
    vector<int> w,b;
    char c;
    int s,ans=0;
    vector<int> arr={0,1};
    w.push_back(0);
    if(use_machine(arr)){
        b.push_back(1);
        arr={0,2};
        if(use_machine(arr)){
            b.push_back(2);
            c='b';
        } else {
            w.push_back(2);
            c='w';
        }
        s=3;
    } else {
        w.push_back(1);
        c='w';
        s=2;
    }
    int d=min(140,(n-s)/2);
    while(d--){
        if(c=='w'){
            arr={w[0],s,w[1],s+1};
            int tmp=use_machine(arr);
            if(tmp%2){
                b.push_back(s+1);
            } else {
                w.push_back(s+1);
            }
            if(tmp/2){
                b.push_back(s);
            } else {
                w.push_back(s);
            }
            s+=2;
        } else {
            arr={b[0],s,b[1],s+1};
            int tmp=use_machine(arr);
            if(tmp%2){
                w.push_back(s+1);
            } else {
                b.push_back(s+1);
            }
            if(tmp/2){
                w.push_back(s);
            } else {
                b.push_back(s);
            }
            s+=2;
        }
    }
    ans=w.size();
    int sz=max(b.size(),w.size());
    while(n-s>=sz){
        arr.clear();
        if(w.size()>b.size()){
            for(int i=0;i<sz;i++,s++){
                arr.push_back(w[i]);
                arr.push_back(s);
            }
            int t=use_machine(arr);
            if(t%2)b.push_back(s-1);
            else w.push_back(s-1);
            ans+=sz-(t+1)/2;
        } else {
            for(int i=0;i<sz;i++,s++){
                arr.push_back(b[i]);
                arr.push_back(s);
            }
            int t=use_machine(arr);
            if(t%2)w.push_back(s-1);
            else b.push_back(s-1);
            ans+=(t+1)/2;
        }
        sz=max(b.size(),w.size());
    }
    arr.clear();
    if(w.size()>b.size()&&s<n){
        for(int i=0;s<n;i++,s++){
            arr.push_back(w[i]);
            arr.push_back(s);
        }
        int t=use_machine(arr);
        ans+=(arr.size())/2-(t+1)/2;
    } else if(s<n){
        for(int i=0;s<n;i++,s++){
            arr.push_back(b[i]);
            arr.push_back(s);
        }
        int t=use_machine(arr);
        ans+=(t+1)/2;
    }
    return ans;
}

• Subtask 1: 0 / 100