Submission #289896

#	Time	Username	Problem	Language	Result	Execution time	Memory
289896		SamAnd	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	3 ms	512 KiB

messy

#include <vector>
#include "messy.h"
#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define fi first
#define se second
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
typedef long long ll;

int n;

void rec0(int l, int r, string s)
{
    if (l == r)
        return;
    int m = (l + r) / 2;
    for (int i = l; i <= m; ++i)
    {
        s[i] = '1';
        add_element(s);
        s[i] = '0';
    }
    for (int i = m + 1; i <= r; ++i)
        s[i] = '1';
    rec0(l, m, s);
    for (int i = m + 1; i <= r; ++i)
        s[i] = '0';
    for (int i = l; i <= m; ++i)
        s[i] = '1';
    rec0(m + 1, r, s);
}

vector<int> ans;

void rec1(int l, int r, string s)
{
    if (l == r)
    {
        for (int i = 0; i < n; ++i)
        {
            if (s[i] == '0')
            {
                ans[i] = l;
            }
        }
        return;
    }
    int m = (l + r) / 2;
    vector<int> v;
    for (int i = 0; i < n; ++i)
    {
        if (s[i] == '0')
        {
            s[i] = '1';
            if (check_element(s))
                v.push_back(i);
            s[i] = '0';
        }
    }

    string sl = s;
    for (int i = 0; i < n; ++i)
    {
        if (s[i] == '0')
        {
            if (!binary_search(all(v), i))
                sl[i] = '1';
        }
    }
    rec1(l, m, sl);

    for (int i = 0; i < sz(v); ++i)
        s[v[i]] = '1';
    rec1(m + 1, r, s);
}

std::vector<int> restore_permutation(int n, int w, int r)
{
    ::n = n;

    string s;
    for (int i = 0; i < n; ++i)
        s += '0';
    rec0(0, n - 1, s);

    compile_set();

    ans.assign(n, 0);
    rec1(0, n - 1, s);
    return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30