Submission #420330

#	Time	Username	Problem	Language	Result	Execution time	Memory
420330		dxz05	Unscrambling a Messy Bug (IOI16_messy)	C++14	0 / 100	1 ms	332 KiB

messy

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

using namespace std;

int n;

void go(int l, int r){
    if (l == r) return;
    int m = (l + r) >> 1;
    string s(n, '1');
    for (int i = l; i <= m; i++) s[i] = '0';
    add_element(s);
    //cout << s << endl;
    go(l, m);
    go(m + 1, r);
}

set<string> myset;

vector<int> ans;

void go2(int l, int r){
    if (!ans.empty()) return;
    if (l == r) return;
    int m = (l + r) >> 1;
    string s(n, '1');
    for (int i = l; i <= m; i++) s[i] = '0';

    for (int i = l; i <= m; i++){
        for (int j = m + 1; j <= r; j++){
            string t = s;
            swap(t[i], t[j]);
            if (myset.find(t) != myset.end()){
                for (int i = 0; i < n; i++) ans.push_back(i);
                swap(ans[i], ans[j]);
                return;
            }
        }
    }

    go2(l, m);
    go2(m + 1, r);
}

std::vector<int> restore_permutation(int _n, int w, int r) {
    n = _n;
    go(0, n - 1);

    compile_set();


    for (int mask = 0; mask < (1 << n); mask++){
        string s;
        for (int i = 0; i < n; i++){
            s += ((mask & (1 << i)) ? '1' : '0');
        }
        if (check_element(s)){
            myset.insert(s);
        }
    }


    go2(0, n - 1);

    return ans;
}

/*
8 256 256
0 1 5 3 4 2 6 7

*/

• Subtask 1: 0 / 20
• Subtask 2: 0 / 18
• Subtask 3: 0 / 11
• Subtask 4: 0 / 21
• Subtask 5: 0 / 30