[Solution] Xor Palindrome CodeChef Solution | CodeChef Problem Solution 2022

[Solution] Xor Palindrome CodeChef Solution | CodeChef Problem Solution 2022

You are given a binary string A$A$ of length N$N$.

You can perform the following type of operation on the string A$A$:

• Choose two different indices i$i$ and j$j$ (1≤i,j≤N)$(1\le i,j\le N)$;
• Change Ai$A_i$ and Aj$A_j$ to Ai⊕Aj$A_i\oplus A_j$. Here ⊕$\oplus$ represents the bitwise XOR operation.

Solution Click Below:-  CLICK HERE

Find the minimum number of operations required to convert the given string into a palindrome.

Input Format

• First line of the input contains T$T$, the number of test cases. Then the test cases follow.

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• First line of each test case contains an integer N$N$ denoting the size of the string.
• Second line of each test case contains a binary string A$A$ of length N$N$ containing 0$0$s and 1$1$s only.

Output Format

For each test case, print the minimum number of operations required to make the string a palindrome.

Constraints

• 1≤T≤1000$1\le T\le 1000$
• 1≤N≤2⋅105$1\le N\le 2\cdot {10}^5$
• Sum of N$N$ over all test cases does not exceeds 2⋅105$2\cdot {10}^5$.