Submission #98802

#	Time	Username	Problem	Language	Result	Execution time	Memory
98802		Alexa2001	Cave (IOI13_cave)	C++17	100 / 100	401 ms	668 KiB

cave

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

const int Nmax = 5005;
using namespace std;

int a[Nmax], ans[Nmax];
bool used[Nmax];

int eh(int x) { if(x == -1) return Nmax; return x; }

void exploreCave(int N)
{
    int i, j, x;
    vector<int> v;

    for(i=0; i<N; ++i)
    {
        v.clear();

        for(j=0; j<N; ++j)
            if(!used[j]) v.push_back(j);

        for(auto it : v) a[it] = 0;

        if(eh(tryCombination(a)) > i) x = 0;
            else x = 1;

        int st, dr, mid;
        st = 0; dr = v.size() - 1;

        while(st < dr)
        {
            mid = (st+dr) / 2;

            for(j=st; j<=mid; ++j) a[v[j]] = x;
            for(j=mid+1; j<=dr; ++j) a[v[j]] = x ^ 1;

            if(eh(tryCombination(a)) > i) dr = mid;
                else st = mid+1;
        }

        st = v[st];
        used[st] = 1;
        a[st] = x;
        ans[st] = i;
    }
    answer(a, ans);
}

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