Game of Thrones – I 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 ProblemGame of Thrones – I – Hacker Rank Solution

Game of Thrones - I – Hacker Rank Solution

Problem:

Dothraki are planning an attack to usurp King Robert’s throne. King Robert learns of this conspiracy from Raven and plans to lock the single door through which the enemy can enter his kingdom.

door

But, to lock the door he needs a key that is an anagram of a palindrome. He starts to go through his box of strings, checking to see if they can be rearranged into a palindrome. Given a string, determine if it can be rearranged into a palindrome. Return the string YES or NO.

Example

One way this can be arranged into a palindrome is . Return YES.

Function Description
Complete the gameOfThrones function below.

gameOfThrones has the following parameter(s):

  • string s: a string to analyze

Returns

  • string: either YES or NO

Input Format

A single line which contains .

Constraints

  •  |s| 
  •  contains only lowercase letters in the range 

Sample Input 0

aaabbbb

Sample Output 0

YES

Explanation 0

A palindromic permutation of the given string is bbaaabb.

Sample Input 1

cdefghmnopqrstuvw

Sample Output 1

NO

Explanation 1

Palindromes longer than 1 character are made up of pairs of characters. There are none here.

Sample Input 2

cdcdcdcdeeeef

Sample Output 2

YES

Explanation 2

An example palindrome from the string: ddcceefeeccdd.

Game of Thrones - I – Hacker Rank Solution
import java.util.Scanner;

/**
 * @author Techno-RJ
 *
 */
public class GameOfThronesI {
	static String gameOfThrones(String s) {
		int a[] = new int[26];
		for (int i = 0; i < s.length(); i++) {
			int index = s.charAt(i) - 'a';
			a[index]++;
		}
		int oddCount = 0;
		for (int i = 0; i < 26; i++) {
			if (a[i] != 0) {
				if ((a[i] & 1) == 1) {
					oddCount++;
				}
			}
		}
		return oddCount > 1 ? "NO" : "YES";

	}

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String s = in.next();
		String result = gameOfThrones(s);
		System.out.println(result);
		in.close();
	}
}

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