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Problem

Submissions

Minimum Swaps To Make Identical Array

Contributed by

Paritosh Singh

Medium

0/80

7 upvotes

Problem Statement

You are given two arrays, ‘A’ and ‘B’, with the same elements in a different order. Your task is to make ‘B’ identical to the ‘A’ by swapping the elements in array ‘B’. You have to find out the minimum number of swaps required.

For Example:

For the first test case, ‘A’ = [5, 6, 4, 10], ‘B’ = [4, 6, 10, 5], here in the ‘B’ we can swap 4 with 10 to form [10, 6, 4, 5] and we can then swap 10 with 5 to form the array [5, 6, 4, 10] which is identical to ‘A’. Hence the answer is 2.

Detailed explanation ( Input/output format, Notes, Constraints, Images )

Input Format:

The first input line contains a single integer  ‘T’ representing the number of test cases.

The first line of each test case contains a single integer ‘N’ representing the size of both arrays.

The second line of each test case contains ‘N’ space-separated integers representing the ‘A’ array elements.

The third line of each test case contains ‘N’ space-separated integers representing the ‘B’ array elements.

Output Format:

For each test case, print a single integer representing the minimum number of swaps required to make ‘B’ identical to ‘A’

Print a separate line for each test case.

Constraints:

1 ≤ T ≤ 10
1 ≤ N ≤ 1000
0 ≤ A[i], B[i] ≤ 10^9

Time Limit: 1 sec

Note :

You do not need to print anything. It has already been taken care of. Just implement the given function.

Sample Input 1:

Sample Output 1:

2
1

Explanation for Sample Input 1:

For the first test case, ‘A’ = [5, 6, 4, 10], ‘B’ = [4, 6, 10, 5], here in the ‘B’ we can swap 4 with 10 to form [10, 6, 4, 5] and we can then swap 10 with 5 to form the array [5, 6, 4, 10] which is identical to ‘A’. Hence the answer is 2.

For the second test case, ‘A’ = [1, 2, 3], ‘B’ = [1, 3, 2], here in the second array we can swap 3 with 2 to form [1, 2, 3] which is identical to ‘A’. Hence the answer is 1.

Sample Input 2:

Sample Output 2:

2
0

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