Practice Pancake Sorting
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
Sort arr using prefix reversals. In one flip, choose a length k from 1 through arr.length and reverse the first k elements. Return a sequence of those chosen lengths that sorts the array in nondecreasing order. Any valid sequence with at most 10 * arr.length flips is accepted.
Source: Pancake Sorting on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
Input
arr = [3,2,4,1]
Output
[4,2,4,3]
# Example 2
Input
arr = [1,2,3]
Output
[]
Constraints
1 <= arr.length <= 100
1 <= arr[i] <= arr.length
All integers in arr are unique (i.e. arr is a permutation of the integers from 1 to arr.length).
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