Submission #728889

#	Time	Username	Problem	Language	Result	Execution time	Memory
728889		nguyentunglam	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	2 ms	468 KiB

messy

#include <vector>
#include<bits/stdc++.h>
using namespace std;

#include "messy.h"

vector<int> p;
int n;

void prepare(int l, int r) {
    if (l == r) return;
    int mid = l + r >> 1;

    string x; for(int i = 0; i < n; i++) x.push_back('1');

    for(int i = l; i <= r; i++) x[i] = '0';
    for(int i = l; i <= mid; i++) {
        x[i] = '1';
        add_element(x);
        x[i] = '0';
    }
    prepare(l, mid); prepare(mid + 1, r);
}

void solve(int l, int r, vector<int> lst) {
    if (l == r) {
        p[lst[0]] = l;
        return;
    }
    int mid = l + r >> 1;
    string x; for(int i = 0; i < n; i++) x.push_back('1');
    for(int &j : lst) x[j] = '0';
    vector<int> Left, Right;
    for(int &j : lst) {
        x[j] = '1';
        if (check_element(x)) Left.push_back(j);
        else Right.push_back(j);
        x[j] = '0';
    }
    solve(l, mid, Left); solve(mid + 1, r, Right);
}

std::vector<int> restore_permutation(int _n, int w, int r) {
    n = _n;
    p.resize(n);
    prepare(0, n - 1);
    compile_set();
    vector<int> init;
    for(int i = 0; i < n; i++) init.push_back(i);
    solve(0, n - 1, init);
    return p;
}

Compilation message (stderr)

messy.cpp: In function 'void prepare(int, int)':
messy.cpp:12:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   12 |     int mid = l + r >> 1;
      |               ~~^~~
messy.cpp: In function 'void solve(int, int, std::vector<int>)':
messy.cpp:30:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   30 |     int mid = l + r >> 1;
      |               ~~^~~

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