Remove repeated digits in a given number

Given an integer, remove consecutive repeated digits from it.

Examples: 

Input: x = 12224
Output: 124

Input: x = 124422
Output: 1242

Input: x = 11332
Output: 132

We need to process all digits of n and remove consecutive representations. We can go through all digits by repeatedly dividing n with 10 and taking n%10.

C++

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// C++ program to remove repeated digits
#include <iostream>
using namespace std;
  
long int removeRecur(long int n)
{
    // Store first digits as previous digit
    int prev_digit = n % 10;
  
    // Initialize power
    long int pow = 10;
    long int res = prev_digit;
  
    // Iterate through all digits of n, note that
    // the digits are processed from least significant
    // digit to most significant digit.
    while (n) {
        // Store current digit
        int curr_digit = n % 10;
  
        if (curr_digit != prev_digit) {
            // Add the current digit to the beginning
            // of result
            res += curr_digit * pow;
  
            // Update previous result and power
            prev_digit = curr_digit;
            pow *= 10;
        }
  
        // Remove last digit from n
        n = n / 10;
    }
  
    return res;
}
  
// Drive program
int main()
{
    long int n = 12224;
    cout << removeRecur(n);
    return 0;
}

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Java














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// Java program to remove repeated digits 


import java.io.*; 


  


class GFG { 


  


    static long removeRecur(long n) 


    { 


          


        // Store first digits as previous 


        // digit 


        long prev_digit = n % 10; 


      


        // Initialize power 


        long pow = 10; 


        long res = prev_digit; 


      


        // Iterate through all digits of n, 


        // note that the digits are  


        // processed from least significant 


        // digit to most significant digit. 


        while (n>0) { 


              


            // Store current digit 


            long curr_digit = n % 10; 


      


            if (curr_digit != prev_digit)  


            { 


                // Add the current digit to 


                // the beginning of result 


                res += curr_digit * pow; 


      


                // Update previous result 


                // and power 


                prev_digit = curr_digit; 


                pow *= 10; 


            } 


      


            // Remove last digit from n 


            n = n / 10; 


        } 


      


        return res; 


    } 


      


    // Drive program 


    public static void main (String[] args) 


    { 


        long n = 12224; 


          


        System.out.println(removeRecur(n)); 


    } 


} 


  


// This code is contributed by anuj_67. 



















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Python3





# Python 3 program to remove repeated digits


def removeRecur(n):


	# Store first digits as previous digit

	prev_digit = n % 10


	# Initialize power

	pow = 10

	res = prev_digit


	# Iterate through all digits of n, note

	# that the digits are processed from

	# least significant digit to most

	# significant digit.

	while (n):


		# Store current digit

		curr_digit = n % 10


		if (curr_digit != prev_digit):


			# Add the current digit to the

			# beginning of result

			res += curr_digit * pow


			# Update previous result and power

			prev_digit = curr_digit

			pow *= 10


		# Remove last digit from n

		n = int(n / 10)


	return res


# Driver Code

if __name__ == ‘__main__’:

	n = 12224

	print(removeRecur(n))


# This code is contributed by

# Surendra_Gangwar



C#














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// C# program to remove repeated digits 


using System; 


  


class GFG { 


  


    static long removeRecur(long n) 


    { 


          


        // Store first digits as previous 


        // digit 


        long prev_digit = n % 10; 


      


        // Initialize power 


        long pow = 10; 


        long res = prev_digit; 


      


        // Iterate through all digits of n, 


        // note that the digits are  


        // processed from least significant 


        // digit to most significant digit. 


        while (n > 0) { 


              


            // Store current digit 


            long curr_digit = n % 10; 


      


            if (curr_digit != prev_digit)  


            { 


                // Add the current digit to 


                // the beginning of result 


                res += curr_digit * pow; 


      


                // Update previous result 


                // and power 


                prev_digit = curr_digit; 


                pow *= 10; 


            } 


      


            // Remove last digit from n 


            n = n / 10; 


        } 


      


        return res; 


    } 


      


    // Drive program 


    public static void Main () 


    { 


        long n = 12224; 


          


        Console.WriteLine(removeRecur(n)); 


    } 


} 


  


// This code is contributed by anuj_67. 



















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PHP














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<?php 


// PHP program to remove  


// repeated digits 


  


function removeRecur($n) 


{ 


      


    // Store first digits  


    // as previous digit 


    $prev_digit = $n % 10; 


  


    // Initialize power 


    $pow = 10; 


    $res = $prev_digit; 


  


    // Iterate through all digits 


    // of n, note that the digits  


    // are processed from least 


    // significant digit to most  


    // significant digit. 


    while ($n) 


    { 


          


        // Store current digit 


        $curr_digit = $n%10; 


  


        if ($curr_digit != $prev_digit) 


        { 


            // Add the current digit 


            // to the beginning of  


            // result 


            $res += $curr_digit * $pow; 


      


            // Update previous result 


            // and power 


            $prev_digit = $curr_digit; 


            $pow *= 10; 


        } 


  


        // Remove last digit 


        // from n 


        $n = $n / 10; 


    } 


  


    return $res; 


} 


  


    // Driver Code 


    $n = 12224; 


    echo removeRecur($n); 


      


// This ocde is contributed by ajit. 


?> 



















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Output: 


124


This article is contributed by Kartik. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above



          
          
          
          

            

    

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Improved By :  jit_t, vt_m, SURENDRA_GANGWAR