1460. Make Two Arrays Equal by Reversing Sub-arrays.cpp

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








class Solution {
public:
    bool canBeEqual(vector<int>& target, vector<int>& arr) {
        vector<int> freq(1001, 0);

        if(target.size()!=arr.size())
            return false;

        for(auto &x: arr)
            freq[x]++;

        for(auto &x: target){
            if(freq[x]>0)
                freq[x]--;
            else return false;
        }

        return true;
    }
};