HackerRank Day 6: Let’s Review – 30 Days of Code Solution

In this article, we will be solving HackerRank Day 6: Let’s Review problem, part of 30 Days of Code. Majorly, we will use Python3 and Java15 to solve the problem.

Objective:

Today we will expand our knowledge of strings, combining it with what we have already learned about loops. Check out the Tutorial tab for learning materials and an instructional video.

Task:

Given a string, S, of length N that is indexed from 0 to N – 1, print its even-indexed and odd-indexed characters as 2 space-separated strings on a single line (see the Sample below for more details).

Note: 0 is considered to be an even index.

Example

s = adbecf

Print abc def

Input Format

The first line contains an integer, T (the number of test cases). Each line i of the T subsequent lines contains a string, S.

Constraints

• 1 <= T <= 10
• 2 <= length of S <= 10000

Output Format

For each String S_j (where 0 <= j <= T – 1), print S_j‘s even-indexed characters, followed by a space, followed by S_j‘s odd-indexed characters.

Sample Input

2
Hacker
Rank

Sample Output

Hce akr
Rn ak

Explanation

Test Case 0: S = “Hacker”

S[0] = “H”

S[1] = “a”

S[2] = “c”

S[3] = “k”

S[4] = “e”

S[5] = “r”

The even indices are 0, 2, and 4, and the odd indices are 1, 3, and 5. We then print a single line of 2 space-separated strings; the first string contains the ordered characters from S‘s even indices (Hce), and the second string contains the ordered characters from S‘s odd indices (akr).

Test Case 1: S = “Rank”

S[0] = “R”

S[1] = “a”

S[2] = “n”

S[3] = “k”

The even indices are 0, and 2, and the odd indices are 1, and 3. We then print a single line of 2 space-separated strings; the first string contains the ordered characters from S‘s even indices (Rn), and the second string contains the ordered characters from S‘s odd indices (ak).

You can find all the source code on my GitHub profile: https://github.com/uttammanani/HackerRank-30-Days-of-Code

Solution Day 6: Let’s Review in Python3

# Enter your code here. Read input from STDIN. Print output to STDOUT

n = int(input())
temp = []
for i in range(0,n):
    s = input()
    temp.append(s)

for i in range(0,n):
    for j in range(0,len(temp[i]),2):
        print(temp[i][j],end='')
    print(end=' ')
    for j in range(1,len(temp[i]),2):
        print(temp[i][j],end='')
    print()

Solution Day 6: Let’s Review in Java15

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Day6 {
    public static void main(String[] args) 
    {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();

        in.nextLine();

        for (int i = 0; i < N; i++) 
        {
            String string = in.nextLine();
            char[] charArray = string.toCharArray();

            for (int j = 0; j < charArray.length; j++) 
            {
                if (j % 2 == 0) 
                {
                    System.out.print(charArray[j]);
                }
            }

            System.out.print(" ");

            for (int j = 0; j < charArray.length; j++) 
            {
                if (j % 2 != 0) 
                {
                    System.out.print(charArray[j]);
                }
            }

            System.out.println();
        }

        in.close();
    }
}

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