[Hacker Rank]: Compare the Triplets solved ✓

Author: Gonzalo Diaz

docs/hackerrank/warmup/compareTriplets.md

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+# [Compare the Triplets](https://www.hackerrank.com/challenges/compare-the-triplets)
+
+Difficulty: #easy
+Category: #warmup
+
+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 \leq a[i] \leq 100 $
+- $ 1 \leq b[i] \leq 100 $
+
+## Sample Input 0
+
+```text
+5 6 7
+3 6 10
+```
+
+## Sample Output 0
+
+```text
+1 1
+```
+
+## Explanation 0
+
+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] $.
+
+## Sample Input 1
+
+```text
+17 28 30
+99 16 8
+```
+
+## Sample Output 1
+
+```text
+2 1
+```
+
+## Explanation 1
+
+Comparing the *0th* elements, $ 17 < 99 $ so Bob receives a point.
+Comparing the *1st* and *2nd* elements $ 28 > 16 $ and $ 30 > 8 $ so Alice
+ receives two points.
+The return array is $ [2, 1] $.

src/pkg/hackerrank/warmup/compareTriplets.go

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+/**
+ * @link Problem definition [[docs/hackerrank/warmup/compareTriplets.md]]
+ */
+
+package hackerrank
+
+import (
+	"errors"
+
+	utils "gon.cl/algorithm-exercises/src/utils"
+)
+
+func CompareTriplets(a []int, b []int) ([]int, error) {
+
+	if len(a) != len(b) {
+		return nil, errors.New("math: square root of negative number")
+	}
+
+	var awards = []int{0, 0}
+
+	for i := 0; i < len(a); i++ {
+		if a[i] > b[i] {
+			awards[0] = awards[0] + 1
+		}
+		if a[i] < b[i] {
+			awards[1] = awards[1] + 1
+		}
+	}
+
+	utils.Info("SolveMeFirst answer => %v", awards)
+
+	return awards, nil
+}

src/pkg/hackerrank/warmup/compareTripletst_test.go

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+package hackerrank
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCompareTripletsBorderCase(t *testing.T) {
+	expectedSolution := []int{1, 1}
+	a := []int{1}
+	b := []int{2, 3}
+
+	testname := fmt.Sprintf("CompareTriplets(%d, %d) => %v \n", a, b, expectedSolution)
+	t.Run(testname, func(t *testing.T) {
+
+		ans, err := CompareTriplets(a, b)
+		assert.Nil(t, ans)
+		assert.Error(t, err)
+	})
+}
+
+func TestCompareTriplets(t *testing.T) {
+
+	expectedSolution := []int{1, 1}
+	a := []int{5, 6, 7}
+	b := []int{3, 6, 10}
+
+	testname := fmt.Sprintf("CompareTriplets(%d, %d) => %v \n", a, b, expectedSolution)
+	t.Run(testname, func(t *testing.T) {
+
+		ans, err := CompareTriplets(a, b)
+		assert.Equal(t, expectedSolution, ans)
+		assert.Nil(t, err)
+	})
+}