Google Online Assessment (OA) - Minimum Number of Decreasing Subsequence Partitions

Given an integer array, split it into strictly decreasing subarrays. Return the minimum number of decreasing subarrays you can get from splitting the array.

Examples

Example 1:

Input:

[5, 2, 4, 3, 1, 7]

Output: 3

Explanation:

The array can be split into [5, 2, 1], [4, 3], [7] to get 3 decreasing subarrays. Or it can be split into [5, 4, 3], [2, 1], [7] to also get 3 decreasing subarrays.

The partition of [5, 4, 3, 2, 1], [7] is not valid because [5, 4, 3, 2, 1] is not a subarray of the original array.

Example 2:

Input:

[2, 9, 13, 14, 4, 8, 7, 6, 10]

Output: 4

Explanation:

[2], [9, 4], [13, 10], [14, 8, 7, 6]

Example 3:

Input:

[6, 6, 6]

Output: 3

Explanation:

[6], [6], [6]

Try it yourself

Solution