Grid Challenge in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

  • It is easy to understand.
  • Algorithm is a step-wise representation of a solution to a given problem.
  • In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the ProblemGrid Challenge – Hacker Rank Solution

Grid Challenge – Hacker Rank Solution


Given a square grid of characters in the range ascii[a-z], rearrange elements of each row alphabetically, ascending. Determine if the columns are also in ascending alphabetical order, top to bottom. Return YES if they are or NO if they are not.


The grid is illustrated below.

a b c
a d e
e f g

The rows are already in alphabetical order. The columns a a eb d f and c e g are also in alphabetical order, so the answer would be YES. Only elements within the same row can be rearranged. They cannot be moved to a different row.

Function Description

Complete the gridChallenge function in the editor below.

gridChallenge has the following parameter(s):

  • string grid[n]: an array of strings


  • string: either YES or NO

Input Format

The first line contains , the number of testcases.

Each of the next  sets of lines are described as follows:
– The first line contains , the number of rows and columns in the grid.
– The next  lines contains a string of length 


Each string consists of lowercase letters in the range ascii[a-z]

Output Format

For each test case, on a separate line print YES if it is possible to rearrange the grid alphabetically ascending in both its rows and columns, or NO otherwise.

Sample Input

STDIN   Function
-----   --------
1       t = 1
5       n = 5
ebacd   grid = ['ebacd', 'fghij', 'olmkn', 'trpqs', 'xywuv']

Sample Output



The x grid in the  test case can be reordered to


This fulfills the condition since the rows 1, 2, …, 5 and the columns 1, 2, …, 5 are all alphabetically sorted.

Grid Challenge – Hacker Rank Solution
import java.util.*;

public class Solution {

    public static void main(String[] args) throws IOException {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        BufferedReader br = new BufferedReader(new InputStreamReader(;
        int t = Integer.parseInt(br.readLine());
            int n = Integer.parseInt(br.readLine());
            String[]grid = new String[n];
            for(int i=0;i<n;i++)
                grid[i] = sort(br.readLine());
            boolean ok = true;
            for(int i=0;i<n;i++){
                for(int j=1;j<n;j++){
                    if(grid[j].charAt(i) < grid[j-1].charAt(i)){
                        ok = false;
    public static String sort(String s){
        char[] array = s.toCharArray();
        return new String(array);

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