hardStackPattern: Monotonic Stack
Minimum Replacements for Non-Decreasing Order Solution
Problem Statement
Given an array of integers, find the minimum number of replacements required to achieve a non-decreasing order.
Examples
Example 1:
Input:[5, 3, 7, 2, 1, 9]
Output:2
Explanation: Replace 9 with 7, and then the array will be in non-decreasing order.
Constraints
- The input array will not be empty.
- The input array will contain unique integers.
- The input array will not contain negative numbers.
Time: O(n) Space: O(n)
Use a monotonic stack to efficiently find the minimum number of replacements, with a time complexity of O(n) and a space complexity of O(n).
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