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Row wise sorting in 2D array
  • Difficulty Level : Easy
  • Last Updated : 09 Apr, 2021
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Given a 2D array, sort each row of this array and print the result.
Examples: 

Input :
77 11 22 3
11 89 1 12
32 11 56 7
11 22 44 33
Output :
3 11 22 77
1 11 12 89
7 11 32 56
11 22 33 44

Input :
8 6 4 5
3 5 2 1
9 7 4 2
7 8 9 5
Output :
4 5 6 8
1 2 3 5
2 4 7 9
5 7 8 9

Method 1 (Using Bubble Sort) 
Start iterating through each row of the given 2D array, and sort elements of each row using an efficient sorting algorithm. 
 

C++




// C++ code to
// sort 2D matrix row-wise
#include<bits/stdc++.h>
using namespace std;
 
void sortRowWise(int m[][4],
                 int r, int c)
{
  // loop for rows of matrix
  for (int i = 0; i < r; i++)
  {
    // loop for column of matrix
    for (int j = 0; j < c; j++)
    {
      // loop for comparison and swapping
      for (int k = 0; k < c - j - 1; k++)
      {
        if (m[i][k] > m[i][k + 1])
        {
          // swapping of elements
          swap(m[i][k], m[i][k + 1]);
        }
      }
    }
  }
 
  // printing the sorted matrix
  for (int i = 0; i < r; i++)
  {
    for (int j = 0; j < c; j++)
      cout << m[i][j] << " ";
    cout << endl;
  }
}
 
// Driver code
int main()
{
  int m[][4] = {{9, 8, 7, 1},
                {7, 3, 0, 2},
                {9, 5, 3, 2},
                {6, 3, 1, 2}};
  int r = sizeof(m[0]) / sizeof(m[0][0]);
  int c = sizeof(m) / sizeof(m[0]);
  sortRowWise(m, r, c);
  return 0;
}
 
// This code is contributed by Rutvik_56

Java




// Java code to sort 2D matrix row-wise
import java.io.*;
 
public class Sort2DMatrix {
 
    static int sortRowWise(int m[][])
    {
        // loop for rows of matrix
        for (int i = 0; i < m.length; i++) {
 
            // loop for column of matrix
            for (int j = 0; j < m[i].length; j++) {
 
                // loop for comparison and swapping
                for (int k = 0; k < m[i].length - j - 1; k++) {
                    if (m[i][k] > m[i][k + 1]) {
 
                        // swapping of elements
                        int t = m[i][k];
                        m[i][k] = m[i][k + 1];
                        m[i][k + 1] = t;
                    }
                }
            }
        }
 
        // printing the sorted matrix
        for (int i = 0; i < m.length; i++) {
            for (int j = 0; j < m[i].length; j++)
                System.out.print(m[i][j] + " ");
            System.out.println();
        }
 
        return 0;
    }
 
    // driver code
    public static void main(String args[])
    {
        int m[][] = { { 9, 8, 7, 1 },
                      { 7, 3, 0, 2 },
                      { 9, 5, 3, 2 },
                      { 6, 3, 1, 2 } };
        sortRowWise(m);
    }
}

Python3




# Python3 code to sort 2D matrix row-wise
def sortRowWise(m):
     
    # loop for rows of matrix
    for i in range(len(m)):
         
        # loop for column of matrix
        for j in range(len(m[i])):
             
            # loop for comparison and swapping
            for k in range(len(m[i]) - j - 1):
                 
                if (m[i][k] > m[i][k + 1]):
                     
                    # swapping of elements
                    t = m[i][k]
                    m[i][k] = m[i][k + 1]
                    m[i][k + 1] = t
                     
    # printing the sorted matrix
    for i in range(len(m)):
        for j in range(len(m[i])):
            print(m[i][j], end=" ")
        print()
 
# Driver code
m = [[9, 8, 7, 1 ],[7, 3, 0, 2],[9, 5, 3, 2],[ 6, 3, 1, 2 ]]
sortRowWise(m)
 
# This code is contributed by shubhamsingh10

C#




// C# code to sort 2D matrix row-wise
using System;
 
class GFG
{
static int sortRowWise(int [,]m)
{
    // loop for rows of matrix
    for (int i = 0;
             i < m.GetLength(0); i++)
    {
 
        // loop for column of matrix
        for (int j = 0;
                 j < m.GetLength(1); j++)
        {
 
            // loop for comparison and swapping
            for (int k = 0;
                     k < m.GetLength(1) - j - 1; k++)
            {
                if (m[i, k] > m[i, k + 1])
                {
 
                    // swapping of elements
                    int t = m[i, k];
                    m[i, k] = m[i, k + 1];
                    m[i, k + 1] = t;
                }
            }
        }
    }
 
    // printing the sorted matrix
    for (int i = 0;
             i < m.GetLength(0); i++)
    {
        for (int j = 0;
                 j < m.GetLength(1); j++)
            Console.Write(m[i, j] + " ");
        Console.WriteLine();
    }
    return 0;
}
 
// Driver Code
public static void Main(String []args)
{
    int [,]m = {{ 9, 8, 7, 1 },
                { 7, 3, 0, 2 },
                { 9, 5, 3, 2 },
                { 6, 3, 1, 2 }};
    sortRowWise(m);
}
}
 
// This code is contributed by 29AjayKumar

Javascript




<script>
 
// JavaScript Program to sort 2D matrix row-wise
 
    function sortRowWise(m)
    {
        // loop for rows of matrix
        for (let i = 0; i < m.length; i++) {
  
            // loop for column of matrix
            for (let j = 0; j < m[i].length; j++) {
  
                // loop for comparison and swapping
                for (let k = 0; k < m[i].length - j - 1; k++) {
                    if (m[i][k] > m[i][k + 1]) {
  
                        // swapping of elements
                        let t = m[i][k];
                        m[i][k] = m[i][k + 1];
                        m[i][k + 1] = t;
                    }
                }
            }
        }
  
        // printing the sorted matrix
        for (let i = 0; i < m.length; i++) {
            for (let j = 0; j < m[i].length; j++)
                document.write(m[i][j] + " ");
            document.write("<br/>");
        }
  
        return 0;
    }
 
// Driver code
 
        let m = [[ 9, 8, 7, 1 ],
                      [ 7, 3, 0, 2 ],
                      [ 9, 5, 3, 2 ],
                      [ 6, 3, 1, 2 ]];
        sortRowWise(m);
 
// This code is contributed by sanjoy_62.
</script>

Output: 
 

1 7 8 9 
0 2 3 7 
2 3 5 9 
1 2 3 6

Method 2 (Using Library Function) 
The idea is to use Arrays.sort() for every row of the matrix.
 

C++




// C++ code to sort 2D
// matrix row-wise
#include <bits/stdc++.h>
using namespace std;
#define M 4
#define N 4
 
int sortRowWise(int m[M][N])
{
  // One by one sort
  // individual rows.
  for (int i = 0; i < M; i++)
    sort(m[i], m[i] + N);
 
  // Printing the sorted matrix
  for (int i = 0; i < M; i++)
  {
    for (int j = 0; j < N; j++)
      cout << (m[i][j]) << " ";
    cout << endl;
  }
}
 
// Driver code
int main()
{
  int m[M][N] = {{9, 8, 7, 1},
                 {7, 3, 0, 2},
                 {9, 5, 3, 2},
                 {6, 3, 1, 2}};
  sortRowWise(m);
}
 
// This code is contributed by gauravrajput1

Java




// Java code to sort 2D matrix row-wise
import java.io.*;
import java.util.Arrays;
 
public class Sort2DMatrix {
 
    static int sortRowWise(int m[][])
    {
        // One by one sort individual rows.
        for (int i = 0; i < m.length; i++)
            Arrays.sort(m[i]);
 
        // printing the sorted matrix
        for (int i = 0; i < m.length; i++) {
            for (int j = 0; j < m[i].length; j++)
                System.out.print(m[i][j] + " ");
            System.out.println();
        }
 
        return 0;
    }
 
    // driver code
    public static void main(String args[])
    {
        int m[][] = { { 9, 8, 7, 1 },
                      { 7, 3, 0, 2 },
                      { 9, 5, 3, 2 },
                      { 6, 3, 1, 2 } };
 
        sortRowWise(m);
    }
}

Python3




# Python3 code to sort 2D matrix row-wise
def sortRowWise(m):
     
    # One by one sort individual rows.
    for i in range(len(m)):
        m[i].sort()
         
    # printing the sorted matrix
    for i in range(len(m)):
        for j in range(len(m[i])):
            print(m[i][j], end=" ")
        print()
         
    return 0
 
# Driver code
m = [[9, 8, 7, 1 ],[7, 3, 0, 2],[9, 5, 3, 2 ],[ 6, 3, 1, 2]]
 
sortRowWise(m)
 
# This code is contributed by shubhamsingh10

C#




// C# code to sort 2D
// matrix row-wise
 
using System;
using System.Collections.Generic;
class Sort2DMatrix{
   
public static int[] GetRow(int[,] matrix,
                           int row)
{
  var rowLength = matrix.GetLength(1);
  var rowVector = new int[rowLength];
  for (var i = 0; i < rowLength; i++)
    rowVector[i] = matrix[row, i];
 
  return rowVector;
}
   
static int sortRowWise(int [,]m)
{
  // One by one sort individual
  // rows.
  for (int i = 0;
           i < m.GetLength(0); i++)
  {
    for (int k = 0;
             k < m.GetLength(1); k++)
      for (int j = 0;
               j < m.GetLength(1) - k - 1; j++)
        if (m[i, j] > m[i, j + 1])
        {
          // swap temp and arr[i]
          int temp = m[i, j];
          m[i, j] = m[i, j + 1];
          m[i, j + 1] = temp;
        }
  }
 
  // Printing the sorted matrix
  for (int i = 0;
           i < m.GetLength(0); i++)
  {
    for (int j = 0;
             j < m.GetLength(1); j++)
      Console.Write(m[i, j] + " ");
    Console.WriteLine();
  }
 
  return 0;
}
 
// Driver code
public static void Main(String []args)
{
  int [,]m = {{9, 8, 7, 1},
              {7, 3, 0, 2},
              {9, 5, 3, 2},
              {6, 3, 1, 2}};
  sortRowWise(m);
}
}
 
// This code is contributed by gauravrajput1

Output:
 

1 7 8 9 
0 2 3 7 
2 3 5 9 
1 2 3 6

 

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