HackerRank Grid Challenge Problem Solution

In this post, we will solve HackerRank Grid Challenge Problem 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.

Example

grid = [abc, ade, efg]

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 t, the number of testcases.

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

utput 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 5×5 grid in the 1 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.

HackerRank Grid Challenge Problem Solution

Grid Challenge C Solution


#include<stdio.h>
#include<string.h>

int main()
{
char a[1000][1000],t;
int i,j=0,k,N,u=0,v,T;

scanf("%d",&T);

for(v=0;v<T;v++)
{
scanf("%d",&N);

for(i=0;i<N;i++)
 {
  
	 scanf("%s",&a[i]);
	
	
   
}


for(i=0;i<N;i++)
 {
 for(k=0;k<N;k++)
  { 
  for(j=0;j<N-1;j++)
    {
	 if(a[i][j]>a[i][j+1])
	   {
	   t=a[i][j];a[i][j]=a[i][j+1];a[i][j+1]=t;
	 
	   
	     }
	 
	 }
	} 
  }	     

for(i=0;i<N;i++)
 {
 for(k=0;k<N;k++)
  { 
  for(j=0;j<N-1;j++)
    {
	 if(a[i][j]>a[i][j+1])
	   {
	   t=a[i][j];a[i][j]=a[i][j+1];a[i][j+1]=t;
	 
	   
	     }
	 
	 }
	} 
  }	     
  
  
 
for(j=0;j<N;j++)
{
 for(k=0;k<N;k++)
  { 
    for(i=0,u=0;i<N-1;i++)
     {
	  if(a[i][j]>a[i+1][j])
	   { u++;
	     printf("NO\n");
	     break;
	     }
	 
	   }
	 if(u!=0) break;
	} 
	
    if(u!=0) break;
  }	     

if(u==0)printf("YES\n");


}



return 0;
}

Grid Challenge C++ Solution

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


bool Solve(vector<vector<char>>& matrix) {
    int n = matrix.size();
    for (int i = 0; i < n; i++) {
        auto& row = matrix[i];
        sort(row.begin(), row.end());
    }
    
    for (int i = 0; i < n - 1; i++) {
        for (int j = 0; j < n; j++) {
            if (matrix[i][j] > matrix[i+1][j])
                return false;
        }
    }
    
    return true;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    
    int cases;
    cin >> cases;
    
    for (int t = 0; t < cases; t++) {
        
        int n;
        cin >> n;
        
        vector<vector<char>> matrix;
        
        for (int i = 0; i < n; i++) {
            vector<char> row(n);
            
            for (int j = 0; j < n; j++) {
                char c;
                cin >> c;
                // cin.get(c);
                row[j] = c;
            }
            matrix.push_back(row);
        }
        
        bool result = Solve(matrix);
        
        if (result) {
            cout << "YES";
        } else {
            cout << "NO";
        }
        
        cout << endl;
    }
    
    return 0;
}

Grid Challenge C Sharp Solution

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Solution {
    static void Main(String[] args) {
        int Cases = Int32.Parse(Console.ReadLine());

        for (int i = 0; i < Cases; i++) {
            int Size = Int32.Parse(Console.ReadLine());
            char[][] Input = populateArray(Size);
            char[][] Rows = sortRows(Input.Select(x => x.ToArray()).ToArray(), Size);

            if (goCompare(Rows, Size))
                Console.WriteLine("YES");
            else
                Console.WriteLine("NO");
        }
    }

    private static char[][] populateArray(int Size) {
        char[][] Input = new char[Size][];
        for (int i = 0; i < Size; i++)
            Input[i] = Console.ReadLine().ToCharArray();

        return Input;
    }

    private static char[][] sortRows(char[][] input, int Size) {
        for (int i = 0; i < Size; i++)
            Array.Sort(input[i]);
        return input;
    }
    private static Boolean goCompare(char[][] Rows, int Size) {
        for (int i = 0; i < Size; i++)
            for (int x = 1; x < Size; x++)
                if (Rows[x][i] < Rows[x - 1][i])
                    return false;
        return true;
    }
}

Grid Challenge Java Solution

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {


    public static String gridChallenge(List<String> grid) {
        char[][] arr = new char[grid.size()][grid.get(0).length()];
        for(int i=0;i<grid.size(); i++){
            char[] word = grid.get(i).toCharArray();
            Arrays.sort(word);
            for(int j=0; j<word.length; j++){
                arr[i][j] = word[j];
            }
        }
        for(int col=0; col<arr[0].length; col++){
            for(int row=0; row<grid.size()-1; row++){
                if(arr[row][col] > arr[row+1][col]){
                    return "NO";
                }
            }
        }
        return "YES";
    }    
}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int t = Integer.parseInt(bufferedReader.readLine().trim());

        IntStream.range(0, t).forEach(tItr -> {
            try {
                int n = Integer.parseInt(bufferedReader.readLine().trim());

                List<String> grid = IntStream.range(0, n).mapToObj(i -> {
                    try {
                        return bufferedReader.readLine();
                    } catch (IOException ex) {
                        throw new RuntimeException(ex);
                    }
                })
                    .collect(toList());

                String result = Result.gridChallenge(grid);

                bufferedWriter.write(result);
                bufferedWriter.newLine();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        });

        bufferedReader.close();
        bufferedWriter.close();
    }
}

Grid Challenge JavaScript Solution

function processData(input) {
    const lines = input.split('\n');
    const tests = Number(lines[0]);
    var curLine = 1;
    for (var q = 0; q < tests; q++) {
        var n = Number(lines[curLine]);
        var arr = [];
        for (var i = 0; i < n; i++) {
            var cur = lines[curLine + i + 1].split('').sort();
            arr.push(cur);
        }
        var failed = false;
        for (var i = 0; i < n - 1 && !failed; i++) {
            for (var j = 0; j < n && !failed; j++) {
                if (arr[i][j] > arr[i+1][j]) failed = true;
            }
        }
        if (failed) console.log("NO");
        else console.log("YES");
        curLine += n + 1;
    }
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});

Grid Challenge Python Solution

w=int(input())
sa=0
while sa!=w:
    x=int(input())
    i=0
    k=""
    s=[]
    while i!=x:
        t=[]
        k=input("")
        for l in k:
            t.append(l)
        t.sort()
        s.append(t)
        i+=1
    i=0
    r=0
    while i!=x-1:

        if r==1:
            break
        for k in range(x):
            if s[i][k]>s[i+1][k]:
                r=1
        
        i+=1

    if r==1:
        print("NO")
    elif r==0:
        print("YES")
    sa=sa+1

c C# C++ HackerRank Solutions java javascript python C cpp CSharp Hackerrank Solutions java javascript python