제출 #293072

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
293072		Haunted_Cpp	고대 책들 (IOI17_books)	C++17	0 / 100	1 ms	512 KiB

books

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


const int MAX_N = 1e6 + 5;
vector<int> p;

int last_p = -1;

long long solve(int idx, int carry) {
  int current_location = idx;
  int nxt_location = carry;
  if (current_location != nxt_location) {
    return abs(idx - nxt_location) + solve(nxt_location, carry);
  }
  assert(idx != -1);
  int was = p[current_location];
  p[current_location] = carry;
  assert(was != carry);
  carry = was;
  nxt_location = carry;
  if (carry == -1) {
    last_p = idx;
    return 0;
  }
  return abs(idx - nxt_location) + solve(nxt_location, carry);
}

long long minimum_walk(vector<int> p, int s) {
  assert(s == 0);
  ::p = p;
  const int n = p.size();
  long long res = 0;
  int idx = 0;
  for (int i = 0; i < n; i++) {
    if (::p[i] != i) {
      int was = ::p[i];
      ::p[i] = -1;
      last_p = -1;
      res += abs(idx - i) + solve(i, was);
      idx = last_p;
      if (is_sorted(::p.begin(), ::p.end())) {
        return idx + res;
      }
    }
  }
  if (is_sorted(::p.begin(), ::p.end())) {
    return idx + res;
  }
  return 0;
}

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