Problem:
Score : 500 points

Problem Statement

You are given a sequence (P_1,P_2,...,P_N) which is a permutation of the integers from 1 through N.
You would like to sort this sequence in ascending order by repeating the following operation:

Choose an element in the sequence and move it to the beginning or the end of the sequence.

Find the minimum number of operations required.
It can be proved that it is actually possible to sort the sequence using this operation.

Constraints

1 \leq N \leq 2\times 10^5

(P_1,P_2,...,P_N) is a permutation of (1,2,...,N).

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
P_1
:
P_N

Output

Print the minimum number of operations required.

Sample Input 1

4
1
3
2
4

Sample Output 1

2

For example, the sequence can be sorted in ascending order as follows:

Move 2 to the beginning. The sequence is now (2,1,3,4).

Move 1 to the beginning. The sequence is now (1,2,3,4).

Sample Input 2

6
3
2
5
1
4
6

Sample Output 2

4

Sample Input 3

8
6
3
1
2
7
4
8
5

Sample Output 3

5

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import java.util.*;

/**
 *
 * @author nai
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int max = 0, min = 100;
        int ans1 = 0,ans2 = 0;
        int[] temp = new int[N];
        //uekara sita
        for(int i = 0; i < N ; i++){
            temp[i] = sc.nextInt();
            if(temp[i] < max){
                ans1++;
            }
            if(temp[i] > max){
                max = temp[i];
            }
            
        }
        for( int i = N-1 ; i>=0 ; i--){
            if(temp[i] > min){
                ans2++;
            }
            if(temp[i] < min){
                min = temp[i];
            }
        }
        if(ans1 > ans2){
            ans1 = ans2;
        }
        System.out.println(ans1 + 1);
    }
    
}