Valid Mountain Array

Given an array A of integers, return true if and only if it is a valid mountain array.

Recall that A is a mountain array if and only if:

A.length >= 3
There exists some i with 0 < i < A.length - 1 such that:
A[0] < A[1] < ... A[i-1] < A[i]
A[i] > A[i+1] > ... > A[A.length - 1]


 

Example 1:

Input: [2,1]
Output: false
Example 2:

Input: [3,5,5]
Output: false
Example 3:

Input: [0,3,2,1]
Output: true
 

Note:

0 <= A.length <= 10000
0 <= A[i] <= 10000 


Solution:-
class Solution {
    public boolean validMountainArray(int[] A) {
        
        if(A.length < 3) return false;
        
        int i = 0;
        boolean flag = false;
        for(i = 1; i < A.length; i++) {
            if(A[i] == A[i - 1]) return false;
            else if(A[i] < A[i - 1]) break;
            flag = true;
        }
        
        if(flag == false) return false;
        
        ++i;
        for(; i < A.length; i++) {
            if(A[i] == A[i - 1]) return false;
            else if(A[i] > A[i - 1]) break;
        }
        
        return i == A.length;
    }
}