932. Monotonic Array

难度: Easy

题目描述

An array is monotonic if it is either monotone increasing or monotone decreasing.

An array nums is monotone increasing if for all i <= j, nums[i] <= nums[j]. An array nums is monotone decreasing if for all i <= j, nums[i] >= nums[j].

Given an integer array nums, return true if the given array is monotonic, or false otherwise.

 

Example 1:

Input: nums = [1,2,2,3]
Output: true

Example 2:

Input: nums = [6,5,4,4]
Output: true

Example 3:

Input: nums = [1,3,2]
Output: false

 

Constraints:

• 1 <= nums.length <= 105
• -105 <= nums[i] <= 105

解题思路

代码实现

解决方案

java

class Solution {
    public boolean isMonotonic(int[] A) {
     boolean result = true;
        for (int i = 0; i < A.length - 1; i++) {
            int i1 = A[i];

            if ( A[i + 1]>=i1) {

            }else {
                if(i < A.length - 1) {
                    result = false;
                }
                break;
            }


        }
        if (result) {
            return result;
        } else {
            result = true;
        }
        for (int i = 0; i < A.length - 1; i++) {
            int i1 = A[i];

            if (A[i + 1]<=i1 ) {

            }else {
                if(i < A.length - 1) {
                    result = false;
                }
                break;
            }


        }
        return result;
    }
}