Java/A_Buy_the_String.java at master · vivek880490/Java · GitHub

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import java.util.*;
import java.lang.*;
import java.io.*;

public class A_Buy_the_String
{

	public static void main (String[] args) throws java.lang.Exception
	{

        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        int a[]=new int[n];
        boolean ans= false;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        if(isPossible(a,n)==true){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }


	}

    static boolean isPossible(int a[], int n)
{

    int cur = a[0];


    cur--;


    for (int i = 1; i < n; i++)
    {


        int nxt = a[i];


        if (nxt > cur)
            nxt--;


        else if (nxt < cur)
            return false;

        cur = nxt;
    }


    return true;
}
}