Xor Palindrome CodeChef Solution

Problem -Xor Palindrome CodeChef Solution

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Xor Palindrome CodeChef Solution in C++17

#include <iostream>
using namespace std;

int main()
{
	int t;
	cin>>t;
	while (t--)
	{
	    int n,c=0;
	    cin>>n;
	    string s;
	    cin>>s;
	    for(int i=0;i<(n+1)/2;i++)
	    {
	        if(s[i]!=s[n-i-1])
	        c++;
	    }
	    
	    cout<<(c+1)/2<<endl;
	}
	
	return 0;
}

Xor Palindrome CodeChef Solution in C++14

#include <iostream>
using namespace std;

int main()
{
	int t;
	cin>>t;
	while (t--)
	{
	    int n,c=0;
	    cin>>n;
	    string s;
	    cin>>s;
	    for(int i=0;i<(n+1)/2;i++)
	    {
	        if(s[i]!=s[n-i-1])
	        c++;
	    }
	    
	    cout<<(c+1)/2<<endl;
	}
	
	return 0;
}

Xor Palindrome CodeChef Solution in PYTH 3

# cook your dish here
# cook your dish here
for _ in range(int(input())):
    n = int(input())
    s = input()
    count_entries_to_be_changed = 0
    for i in range(n//2):
        if s[i] != s[n-i-1]:
            count_entries_to_be_changed += 1
    
    print(count_entries_to_be_changed//2 + count_entries_to_be_changed%2)

Xor Palindrome CodeChef Solution in C

#include <stdio.h>

int main(void)
{
    int t;
    scanf("%d",&t);
    for( int j=0;j<t;j++)
    {
        int n,count=0;
        scanf("%d",&n);
        char a[n];
        scanf("%s",a);
        for(int i=0; i<(n/2);i++)
        {
            if(a[i]!=a[n-i-1])
            {
                count ++;
                }
            }
            printf("%d\n",(count+1)/2);
    }
    return 0;
                }
	// your code goes here

Xor Palindrome CodeChef Solution in JAVA

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		for(int j=0;j<t;j++)
		{
		    int n=sc.nextInt();
		    String s=sc.next();int count1=0;int count0=0;
		      for(int i=0;i<n/2;i++)
		      {
		          if(s.charAt(i)!=s.charAt(n-i-1))
		          {
		              count0++;
		          }
		      }
		  System.out.println((count0+1)/2);
		
		
		}
	}
}

Xor Palindrome CodeChef Solution in PYPY 3

for _ in range(int(input())):
    n=int(input())
    s=input()
    count=0
    for i in range(n//2):
        count += s[i]!=s[n-i-1]
    print((count+1)//2)

Xor Palindrome CodeChef Solution in PYTH

t = int(raw_input())
for i in range(t):
	N = int(raw_input())
	st = raw_input().strip()
	r = 0
	for p in range(N/2):
		if st[p] != st[N-1-p]:
			r += 1
		# endif
	# endfor p
	n = r/2 + r%2
	print n
# endfor i

Xor Palindrome CodeChef Solution in C#

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Text;
using System.Numerics;

public class Test
{
	public static void Main()
	{
	    var WS = new StringBuilder();
	    int A = GetInt();
	    while(A-- != 0){
	        var n = int.Parse(Console.ReadLine());
		    var str = Console.ReadLine();
		    int i=0;
		    int j=n-1;
		    int op=0;
		    while(i<j){
		        if(str[i]!=str[j])
		            op++;
		        i++;
		        j--;
		    }
		    WS.Append(op/2 + op%2 + "\n");
	    }
	    
	    Console.WriteLine(WS.ToString());
		// your code goes here
	}
	
		public static void Writex(string s) => (Console.WriteLine(s));
	public static int GetInt() => int.Parse(Console.ReadLine());
    public static long GetLong() => long.Parse(Console.ReadLine());
    public static string GetString() => (Console.ReadLine());

    public static string[] GetStringArray() => Console.ReadLine().Trim().Split(' ');
    public static int[] GetIntArray() => Console.ReadLine().Trim().Split(' ').Select(int.Parse).ToArray();
        public static long[] GetLongArray() =>  Console.ReadLine().Trim().Split(' ').Select(long.Parse).ToArray();
}

Xor Palindrome CodeChef Solution in NODEJS

process.stdin.resume();
process.stdin.setEncoding('utf8');

var stdin_input = "";

process.stdin.on("data", function (input) {
    stdin_input += input;                               
});

process.stdin.on("end", function () {
   main(stdin_input);
});

function main(input) {
    input = input.split("\n");
    const testCases = Number(input[0]);
    let j = 1;
    for(let i=0;i<testCases;i++) {
        let n = Number(input[j]);
        j++;
        console.log(getMax(n,convertToNumber(input[j].split(""))));
        j++;
    }
}

function getMax(n,arr) {
    let left = 0;
    let right = n-1;
    let count=0;
    while(left<right) {
        if(arr[left]!=arr[right]) {
            count++;
        }
        left++;
        right--;
    }
    return Math.ceil(count/2);
}

function convertToNumber(arr) {
    return arr.map((a)=> {
        return Number(a);
    });
}

Xor Palindrome CodeChef Solution in GO

package main

import (
    "fmt"
    "math"
    )

func main() {
	var T int
	fmt.Scan(&T)
	for i:=0; i<T; i++ {
		var N int
		fmt.Scan(&N)
		var a string
		fmt.Scan(&a)
		var zeros1 int = 0
		var ones1 int = 0
		var zeros2 int = 0
		var ones2 int = 0
		for j:=0; j<N/2; j++ {
			if (a[j] == '1' && a[N-1-j] == '0') {
				ones1 += 1
				zeros2 += 1
			} else if a[j] == '0' && a[N-1-j] == '1' {
				zeros1 += 1
				ones2 += 1
			}
		}

		var first int = zeros1 + (ones1+1)/2
		var second int = zeros2 + (ones2+1)/2
		var third int = zeros1+zeros2
		var fourth int = (ones1+ones2+1)/2
		fmt.Println(math.Min(float64(first), math.Min(float64(second), math.Min(float64(third), float64(fourth)))))
	}
}

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