Submission #412875

#	Time	Username	Problem	Language	Result	Execution time	Memory
412875		Falcon	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	3 ms	492 KiB

messy

#include <vector>
#include <cassert>
#include <algorithm>
#include <iostream>

#include "messy.h"

using namespace std;

void add_interval(int l, int r, int n) {
    if(r - l == 1) return;

    string s(n, '0');
    for(int i{0}; i < l; ++i) s[i] = '1';
    for(int i{r}; i < n; ++i) s[i] = '1';

    int m{(l + r) >> 1};
    for(int i{l}; i < m; ++i) {
        s[i] = '1';
        add_element(s);
        s[i] = '0';
    }

    add_interval(l, m, n);
    add_interval(m, r, n);
}

vector<int> p;
void solve_interval(int l, int r, int n, string s) {

    if(r - l == 1) {
        for(int i{}; i < n; ++i)
            if(s[i] == '0')
                p[i] = l;
        return;
    }

    vector<int> in, out;
    for(int i{}; i < n; ++i) {
        if(s[i] == '0') {
            s[i] = '1';
            if(check_element(s)) in.push_back(i);
            else out.push_back(i);
            s[i] = '0';
        }
    }


    for(int i: out) s[i] = '1';
    solve_interval(l, (l + r) >> 1, n, s);
    for(int i: out) s[i] = '0';
    for(int i: in) s[i] = '1';
    solve_interval((l + r) >> 1, r, n, s);
}

vector<int> restore_permutation(int n, int, int) {
    p.resize(n);

    add_interval(0, n, n);
    compile_set();
    solve_interval(0, n, n, string(n, '0'));

    return p;
}

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