Submission #127000

#	Time	Username	Problem	Language	Result	Execution time	Memory
127000		Bench0310	Cave (IOI13_cave)	C++17	46 / 100	733 ms	920 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"

using namespace std;

void exploreCave(int n)
{
    mt19937 rng(14);
    set<int> s;
    for(int i=0;i<n;i++) s.insert(i);
    vector<bool> vis(n,0);
    int b[n],d[n];
    for(int i=0;i<n;i++) b[i]=0;
    int now=tryCombination(b);
    while(now!=-1)
    {
        set<int> t=s;
        vector<bool> v=vis;
        while(1)
        {
            int r=uniform_int_distribution<int>(0,n-1)(rng);
            if(v[r])
            {
                if(t.lower_bound(r)!=s.end()) r=*t.lower_bound(r);
                else r=*t.begin();
            }
            v[r]=1;
            t.erase(r);
            b[r]=1-b[r];
            int guess=tryCombination(b);
            if(guess>now||guess==-1)
            {
                now=guess;
                s.erase(r);
                vis[r]=1;
                break;
            }
            if(guess<now)
            {
                s.erase(r);
                vis[r]=1;
            }
            b[r]=1-b[r];
        }
    }
    for(int i=0;i<n;i++)
    {
        b[i]=1-b[i];
        int t=tryCombination(b);
        d[i]=t;
        b[i]=1-b[i];
    }
    answer(b,d);
}

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24