Agregar índice a los caracteres e invertir la string

Dada una string str , la tarea es cifrar e invertir la string. La string se cifra agregando cada carácter de la string con su índice en la string, es decir, si el carácter ‘a’ está en el índice 2 , entonces el carácter en la string actualizada será ‘a’ + 2 = ‘c’ . Dado que el valor de la string puede ir más allá de 256, realice la suma en el módulo 256.
Ejemplos: 
 

Entrada: str = «geeks» 
Salida: wngfg 
‘g’ + 0 = ‘g’ 
‘e’ + 1 = ‘f’ 
‘e’ + 2 = ‘g’ 
‘k’ + 3 = ‘n’ 
‘s’ + 4 = ‘w’ 
Entrada: str = “java” 
Salida: dxbj 
 

Acercarse: 
 

• Agregue cada carácter de la string con su índice dentro de la misma string.
• Invierte la cuerda.
• Imprime la string invertida.

A continuación se muestra la implementación del enfoque anterior: 
 

// C++ implementation of the approach
#include <bits/stdc++.h>
using namespace std;
 
// Function to return the encryptet string
string getEncryptedString(string str)
{
 
    // To build the encrypted string
    string sb ="";
 
    // Traverse the string in reverse
    for (int i = str.length() - 1; i >= 0; i--)
    {
        sb+=(char)((int)str[i] + i) % 256;
    }
 
    // Return the encrypted string
    return sb;
}
 
// Driver code
int main()
{
    string str = "geeks";
    cout<<getEncryptedString(str)<<endl;
    return 0;
     
}
 
// This code is contributed by mits

// Java implementation of the approach
public class HelloWorld {
 
    // Function to return the encryptet string
    static String getEncryptedString(String str)
    {
 
        // To build the encrypted string
        StringBuilder sb = new StringBuilder("");
 
        // Traverse the string in reverse
        for (int i = str.length() - 1; i >= 0; i--) {
            sb.append("" + (char)((str.charAt(i) + i) % 256));
        }
 
        // Return the encrypted string
        return sb.toString();
    }
 
    // Driver code
    public static void main(String[] args)
    {
        String str = "geeks";
        System.out.println(getEncryptedString(str));
    }
}

# Python3 implementation of the approach
 
# Function to return the encryptet string
def getEncryptedString(str):
 
 
    # To build the encrypted string
    sb = "";
 
    # Traverse the string in reverse
    for i in range(len(str) - 1,-1,-1):
        sb += chr((ord(str[i]) + i) % 256);
 
    # Return the encrypted string
    return sb;
 
# Driver code
str = "geeks";
print(getEncryptedString(str));
 
# This code is contributed by mits

// C# implementation of the approach
using System;
using System.Text;
 
public class HelloWorld
{
 
    // Function to return the encryptet string
    static String getEncryptedString(String str)
    {
 
        // To build the encrypted string
        StringBuilder sb = new StringBuilder("");
 
        // Traverse the string in reverse
        for (int i = str.Length - 1; i >= 0; i--)
        {
            sb.Append("" + (char)((str[i] + i) % 256));
        }
 
        // Return the encrypted string
        return sb.ToString();
    }
 
    // Driver code
    public static void Main(String[] args)
    {
        String str = "geeks";
        Console.WriteLine(getEncryptedString(str));
    }
}
 
// This code contributed by Rajput-Ji

<?php
// PHP implementation of the approach
 
// Function to return the encryptet string
function getEncryptedString($str)
{
 
    // To build the encrypted string
    $sb = "";
 
    // Traverse the string in reverse
    for ($i = strlen($str) - 1; $i >= 0; $i--)
    {
        $sb .= chr((ord($str[$i]) + $i) % 256);
    }
 
    // Return the encrypted string
    return $sb;
}
 
// Driver code
$str = "geeks";
print(getEncryptedString($str));
 
// This code is contributed by mits
?>

<script>
// javascript implementation of the approach
 
    // Function to return the encryptet string
     function getEncryptedString( str)
     {
 
        // To build the encrypted string
        sb = "";
 
        // Traverse the string in reverse
        for (i = str.length - 1; i >= 0; i--) {
            sb+=("" + String.fromCharCode((str.charCodeAt(i) + i) % 256));
        }
 
        // Return the encrypted string
        return sb;
    }
 
    // Driver code
    var str = "geeks";
    document.write(getEncryptedString(str));
 
// This code is contributed by Rajput-Ji
</script>

wngfg