Compare the Triplets Solution in Kotlin -HackerRank

Problem

Alice and Bob each created one problem for HackerRank. A reviewer rates the two challenges, awarding points on a scale from 1 to 100 for three categories: problem clarity, originality, and difficulty.

The rating for Alice’s challenge is the triplet a = (a[0], a[1], a[2]), and the rating for Bob’s challenge is the triplet b = (b[0], b[1], b[2]).

The task is to find their comparison points by comparing a[0] with b[0], a[1] with b[1], and a[2] with b[2].

• If a[i] > b[i], then Alice is awarded 1 point.
• If a[i] < b[i], then Bob is awarded 1 point.
• If a[i] = b[i], then neither person receives a point.

Comparison points is the total points a person earned.

Given a and b, determine their respective comparison points.

Example

a = [1, 2, 3]
b = [3, 2, 1]

• For elements *0*, Bob is awarded a point because a[0] .
• For the equal elements a[1] and b[1], no points are earned.
• Finally, for elements 2, a[2] > b[2] so Alice receives a point.

The return array is [1, 1] with Alice’s score first and Bob’s second.

Function Description

Complete the function compareTriplets in the editor below.

compareTriplets has the following parameter(s):

• int a[3]: Alice’s challenge rating
• int b[3]: Bob’s challenge rating

Return

• int[2]: Alice’s score is in the first position, and Bob’s score is in the second.

Input Format

The first line contains 3 space-separated integers, a[0], a[1], and a[2], the respective values in triplet a.
The second line contains 3 space-separated integers, b[0], b[1], and b[2], the respective values in triplet b.

Constraints

• 1 ≤ a[i] ≤ 100
• 1 ≤ b[i] ≤ 100

Sample Input

17 28 30
99 16 8

Sample Output

2 1

ANSWER

fun compareTriplets(a: Array<Int>, b: Array<Int>): Array<Int> {
var alicePoints = 0
var bobPoints = 0
   for (x in 0 until a.size) {
      val itAlice = a[x]
      val itBob = b[x]
      if (itAlice > itBob) {
         alicePoints++
      } else if (itAlice < itBob) {
        bobPoints++
      }
   }
return arrayOf(alicePoints, bobPoints)
}

Explanation

in this example:

a = (a[0], a[1], a[2] ) = (5,6,7)

b = (b[0], b[1], b[2]) = (3,6,10)

Now, let’s compare each individual score:

a[0] > b[0], so Alice receives 1 point.

a[1] =b[1], so nobody receives a point.

a[2] <b[2], so Bob receives 1 point.

Alice’s comparison score is 1, and Bob’s comparison score is 1. Thus, we return the array [1,1].

Comparing the 0 elements, 17 < 99 so Bob receives a point.
Comparing the 1 and 2 elements, 28 > 16 and 30 > 8 so Alice receives two points.
The return array is [2,1].