Submission #318524

#	Time	Username	Problem	Language	Result	Execution time	Memory
318524		Lemur95	Ancient Books (IOI17_books)	C++17	50 / 100	154 ms	19172 KiB

books

#include <bits/stdc++.h>
#include "books.h"
#pragma GCC optimize("Ofast")
#define x first
#define y second
#define ld long double
#define ll long long

using namespace std;

int n, s, x;

ll minimum_walk(vector <int> p, int s) {
  ll ans = 0;
  int n = p.size(), r = -1;
  vector <bool> viz(n + 5);
  vector <int> f(n + 5);
  fill(f.begin(), f.end(), 0);
  for(int i = 0; i < n; i++) {
    ans += abs(i - p[i]);
    f[min(i, p[i])]++;
    f[max(i, p[i])]--;
  }
  int cnt = 0;
  if(!f[0])
    cnt++;
  for(int i = 1; i < n - 1; i++) {
    f[i] += f[i - 1];
    if(!f[i])
      cnt++;
    else
      ans += 2 * cnt, cnt = 0;
  }
  return ans;
}

/*int main() {
  ios_base :: sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n >> s;
  vector <int> p;
  for(int i = 1; i <= n; i++)
    cin >> x, p.push_back(x);
  cout << minimum_walk(p, s);
  return 0;
}*/

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:15:21: warning: unused variable 'r' [-Wunused-variable]
   15 |   int n = p.size(), r = -1;
      |                     ^

• Subtask 1: 12 / 12
• Subtask 2: 10 / 10
• Subtask 3: 28 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30