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
Constraints:
- target.length == arr.length
- 1 <= target.length <= 1000
- 1 <= target[i] <= 1000
- 1 <= arr[i] <= 1000
Solution
class Solution {
public boolean canBeEqual(int[] array_a, int[] array_b) {
if (array_a.length != array_b.length) {
return false;
}
int n = array_a.length;
int[] freq1 = new int[1_001];
int[] freq2 = new int[1_001];
for (int i = 0; i < n; i++) {
freq1[array_a[i]]++;
freq2[array_b[i]]++;
}
return Arrays.equals(freq1, freq2);
}
}