Remove first X rows and columns from a matrix

Given an integer X and a square matrix mat[][], the task is to remove the first X rows and columns from the given matrix and print the updated matrix.

Examples:

Input: mat[][] = {
{1, 2, 3, 4},
{5, 6, 7, 8},
{8, 9, 4, 2},
{4, 8, 9, 2} },
X = 2
Output:
4 2
9 2



Input: mat[][] = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9} },
X = 1
Output:
5 6
8 9

Approach: Print the elements of the matrix arr[i][j] for all i, j ∈ [X, N – 1] where N is the order of the given square matrix.

Below is the implementation of the above approach:

C++

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// C++ implementation of the approach
#include <iostream>
using namespace std;
  
const int MAX = 50;
  
// Function to print the matrix after
// ignoring first x rows and columns
void remove_row_col(int arr[][MAX], int n, int x)
{
  
    // Ignore first x rows and columns
    for (int i = x; i < n; i++) {
        for (int j = x; j < n; j++) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
}
  
// Driver Code
int main()
{
  
    // Order of the square matrix
    int n = 3;
    int arr[][MAX] = { { 1, 2, 3 },
                       { 4, 5, 6 },
                       { 7, 8, 9 } };
  
    int x = 1;
    remove_row_col(arr, n, x);
}

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Java

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// Java implementation of the approach
  
import java.io.*;
  
class GFG 
{
  
static int MAX = 50;
  
// Function to print the matrix after
// ignoring first x rows and columns
static void remove_row_col(int arr[][], int n, int x)
{
  
    // Ignore first x rows and columns
    for (int i = x; i < n; i++) 
    {
        for (int j = x; j < n; j++)
        {
            System.out.print( arr[i][j] + " ");
        }
        System.out.println();
    }
}
  
// Driver Code
public static void main (String[] args) 
{
    // Order of the square matrix
    int n = 3;
    int arr[][] = { { 1, 2, 3 },
                    { 4, 5, 6 },
                    { 7, 8, 9 } };
  
    int x = 1;
    remove_row_col(arr, n, x);
}
}
  
// This code is contributed by 
// shk

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Python3

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# Python3 implementation of the approach 
  
# Function to print the matrix after 
# ignoring first x rows and columns 
def remove_row_col(arr, n, x): 
  
    # Ignore first x rows and columns 
    for i in range(x, n): 
        for j in range(x, n): 
            print(arr[i][j], end = " "
          
        print()
  
# Driver Code 
if __name__ == "__main__":
  
    # Order of the square matrix 
    n = 3
    MAX = 50
    arr = [[1, 2, 3], 
           [4, 5, 6], 
           [7, 8, 9]] 
  
    x = 1
    remove_row_col(arr, n, x) 
      
# This code is contributed by Rituraj Jain

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C#

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// C# implementation of the approach 
using System;
  
class GFG 
    // Function to print the matrix after 
    // ignoring first x rows and columns 
    static void remove_row_col(int [,]arr, int n, int x) 
    
      
        // Ignore first x rows and columns 
        for (int i = x; i < n; i++) 
        
            for (int j = x; j < n; j++) 
            
                Console.Write(arr[i, j] + " "); 
            
            Console.WriteLine(); 
        
    
      
    // Driver Code 
    public static void Main() 
    
        // Order of the square matrix 
        int n = 3; 
        int [,]arr = { { 1, 2, 3 }, 
                        { 4, 5, 6 }, 
                        { 7, 8, 9 } }; 
      
        int x = 1; 
        remove_row_col(arr, n, x); 
    
  
// This code is contributed by Ryuga

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PHP

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<?php
// PHP implementation of the approach
  
$MAX = 50;
  
// Function to print the matrix after
// ignoring first x rows and columns
function remove_row_col($arr, $n, $x)
{
  
    // Ignore first x rows and columns
    for ($i = $x; $i < $n; $i++) 
    {
        for ($j = $x; $j < $n; $j++) 
        {
            echo $arr[$i][$j] . " ";
        }
        echo "\n";
    }
}
  
// Driver Code
  
// Order of the square matrix
$n = 3;
$arr = array(array( 1, 2, 3 ),
             array( 4, 5, 6 ),
             array( 7, 8, 9 ));
  
$x = 1;
remove_row_col($arr, $n, $x);
  
// This code is contributed by ihritik
?>

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Output:

5 6 
8 9


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