Submission #426361

#	Time	Username	Problem	Language	Result	Execution time	Memory
426361		zoooma13	Unscrambling a Messy Bug (IOI16_messy)	C++14	100 / 100	3 ms	512 KiB

messy

#include "bits/stdc++.h"
#include "messy.h"
using namespace std;

vector <string> gen(int n){
    if(n == 1)
        return {};
    vector <string> cur;
    for(int i = n/2; i < n; i++){
        string s(n ,'0');
        s[i] = '1';
        cur.push_back(s);
    }
    auto sub = gen(n/2);
    for(auto&s : sub)
        cur.push_back(string(n/2 ,'1') + s);
    for(auto&s : sub)
        cur.push_back(s + string(n/2 ,'1'));
    return cur;
}
int n;
vector <int> p;
void solve(vector <int> active){
    if(active.size() == 1)
        return;

    string s(n ,'1');
    for(int i : active)
        s[i] = '0';

    vector <int> good ,bad;
    for(int i : active){
        string t = s;
        t[i] = '1';
        if(check_element(t))
            good.push_back(i);
        else
            bad.push_back(i);
    }

    int b = __builtin_ctz(active.size())-1;
    for(int&g : good)
        p[g] |= 1<<b;
    solve(good);
    solve(bad);
}

vector<int> restore_permutation(int _n, int w, int r){
    n = _n;
    p.resize(n);
    for(auto&s : gen(n))
        add_element(s);
    compile_set();
    vector <int> range;
    for(int i = 0; i < n; i++)
        range.push_back(i);
    solve(range);
    return p;
}

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