Submission #921063

#	Time	Username	Problem	Language	Result	Execution time	Memory
921063		oolimry	Ancient Books (IOI17_books)	C++17	0 / 100	1 ms	1372 KiB

books

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

long long minimum_walk(vector<int> p, int s) {
  bool done[1100100];
  int N = p.size();

  int un = N;
  int soom = 0;

  int i = 0;

  int fre = 0;
  int lastPos = 0;
  for(int i = 0;i < N;i++) if(p[i] != i) lastPos = i;


  for(int i = 0; i <= lastPos; i++){
    if(done[i]) continue;

    if(i > fre){
      soom += 2;
    }

    fre = i;
    int j = p[i];
    soom += abs(j - i);
    while(j != i){
      int temp = j;
      fre = max(fre,j);
      done[j] = true;
      j = p[j];
      soom += abs(temp - j);
    }
  }

  for(int i = N - 1; i > 0; i--){
    if(p[i] != i){
      break;
    }
    soom -= 2;
  }



  return soom;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:10:7: warning: unused variable 'un' [-Wunused-variable]
   10 |   int un = N;
      |       ^~
books.cpp:13:7: warning: unused variable 'i' [-Wunused-variable]
   13 |   int i = 0;
      |       ^

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