描述
Given two integer arrays of equal length target and arr.
In one step, you can select any non-empty sub-array of arr and reverse it. You are allowed to make any number of steps.
Return True if you can make arr equal to target, or False otherwise.
Example 1:
Input: target = [1,2,3,4], arr = [2,4,1,3]
Output: true
Explanation: You can follow the next steps to convert arr to target:
1- Reverse sub-array [2,4,1], arr becomes [1,4,2,3]
2- Reverse sub-array [4,2], arr becomes [1,2,4,3]
3- Reverse sub-array [4,3], arr becomes [1,2,3,4]
There are multiple ways to convert arr to target, this is not the only way to do so.
Example 2:
Input: target = [7], arr = [7]
Output: true
Explanation: arr is equal to target without any reverses.
Example 3:
Input: target = [1,12], arr = [12,1]
Output: true
Example 4:
Input: target = [3,7,9], arr = [3,7,11]
Output: false
Explanation: arr doesn't have value 9 and it can never be converted to target.
Example 5:
Input: target = [1,1,1,1,1], arr = [1,1,1,1,1]
Output: true
Note:
target.length == arr.length
1 <= target.length <= 1000
1 <= target[i] <= 1000
1 <= arr[i] <= 1000
解析
根据题意，别被题目带偏了，其实只需要判断，两个数组的元素是否都一样即可，因为子数组可以反转，其实只要元素都一样，怎么都会反转到一模一样。
解答
class Solution(object):
def canBeEqual(self, target, arr):
"""
:type target: List[int]
:type arr: List[int]
:rtype: bool
"""
return True if Counter(target) == Counter(arr) else False
运行结果
Runtime: 64 ms, faster than 66.15% of Python online submissions for Make Two Arrays Equal by Reversing Sub-arrays.
Memory Usage: 13.8 MB, less than 34.42% of Python online submissions for Make Two Arrays Equal by Reversing Sub-arrays.
原题链接：leetcode.com/problems/ma…
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