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

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Algorithm Hackerrank Solution | Hackerrank Java Solution

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank, Algorithm Solutions of Problem Solving Section in Java. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for Grid Challenge in Java-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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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 Problem – Grid Challenge – Hacker Rank Solution 

Grid Challenge – Hacker Rank Solution

Problem:

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.

Example

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 e, b 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

Returns

  • 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 

Constraints



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']
fghij
olmkn
trpqs
xywuv

Sample Output

YES

Explanation

The x grid in the  test case can be reordered to

abcde
fghij
klmno
pqrst
uvwxy

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.io.*;
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(System.in));
        int t = Integer.parseInt(br.readLine());
        while(t-->0){
            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;
                        break;
                    }
                }
            }
            System.out.println(ok?"YES":"NO");
            
        }
    }
    
    public static String sort(String s){
        char[] array = s.toCharArray();
        Arrays.sort(array);
        return new String(array);
    }
}

105 thoughts on “Grid Challenge in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]”

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