Submission #614576

#	Time	Username	Problem	Language	Result	Execution time	Memory
614576		brucecccccc	Unscrambling a Messy Bug (IOI16_messy)	C++14	100 / 100	3 ms	468 KiB

messy

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

using namespace std;

int n;
vector<int> ans;

void set_element(int l, int r) {
  if (l == r) return;

  int m = (l + r) / 2;

  string x(n, '0');
  for (int i = 0; i < n; i++)
    if (i < l || i > r) x[i] = '1';

  for (int i = l; i <= m; i++) {
    string k = x;
    k[i] = '1';
    add_element(k);
  }

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

void get(int l, int r, vector<bool> pos) {
  if (l == r) {
    int val;
    for (int i = 0; i < n; i++)
      if (pos[i]) val = i;
    ans[val] = l;
    return;
  }

  vector<bool> left(n, false), right(n, false);
  string x(n, '0');
  for (int i = 0; i < n; i++)
    if (!pos[i]) x[i] = '1';
  
  for (int i = 0; i < n; i++) {
    if (pos[i]) {
      string j = x;
      j[i] = '1';
      if (check_element(j)) left[i] = true;
      else right[i] = true;
    }
  }
  int m = (l + r) / 2;
  get(l, m, left);
  get(m+1, r, right);
}

vector<int> restore_permutation(int N, int w, int r) {
  n = N;
  ans.resize(n);

  vector<bool> pos(n, true);

  set_element(0, n-1);
  compile_set();
  get(0, n-1, pos);

  return ans;
}

Compilation message (stderr)

messy.cpp: In function 'void get(int, int, std::vector<bool>)':
messy.cpp:33:12: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
   33 |     ans[val] = l;
      |            ^

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