Submission #563879

#	Time	Username	Problem	Language	Result	Execution time	Memory
563879		HappyPacMan	Unscrambling a Messy Bug (IOI16_messy)	C++14	100 / 100	2 ms	480 KiB

messy

#include "messy.h"
#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
vi res;
int N;
string submit;

void firstHalf(int l,int r){
    if(r-l){
        int m = (l+r)/2;
        for(int i=0;i<N;i++){
            if(i < l || i > r){
                submit[i] = '1';
            }
        }
        for(int i=l;i<=m;i++){
            submit[i] = '1';
            add_element(submit);
            submit[i] = '0';
        }
        for(int i=0;i<N;i++){
            if(i < l || i > r){
                submit[i] = '0';
            }
        }
        firstHalf(l,m);
        firstHalf(m+1,r);
    }
}
void secondHalf(int l,int r,vi used,vi unused){
    if(r-l){
        int m = (l+r)/2;
        for(int it : unused){
            submit[it] = '1';
        }
        vi left,right;
        for(int it : used){
            submit[it] = '1';
            bool valid = check_element(submit);
            if(valid){
                left.emplace_back(it);
            }else{
                right.emplace_back(it);
            }
            submit[it] = '0';
        }
        for(int i=0;i<N;i++){
            submit[i] = '0';
        }
        vi lunused = unused, runused = unused;
        lunused.insert(lunused.begin(),left.begin(),left.end());
        runused.insert(runused.begin(),right.begin(),right.end());
        secondHalf(l,m,left,runused);
        secondHalf(m+1,r,right,lunused);
    }else{
        res[used.back()] = l;
    }
}

std::vector<int> restore_permutation(int n, int w, int r) {
    N = n;
    vi used,unused;
    for(int i=0;i<N;i++){
        res.emplace_back(i);
        submit.push_back('0');
        used.emplace_back(i);
    }
    firstHalf(0,N-1);
    compile_set();
    secondHalf(0,N-1,used,unused);
    return res;
}

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