[Hacker Rank] Interview Preparation Kit: Arrays: Left Rotation. WIP.

Author: Gonzalo Diaz

exercises/hackerrank/interview_preparation_kit/arrays/ctci_array_left_rotation.go

@@ -0,0 +1,10 @@
+package hackerrank
+
+func rotLeft(a []int32, d int32) []int32 {
+	// Write your code here
+	return []int32{}
+}
+
+func RotLeft(a []int32, d int32) []int32 {
+	return rotLeft(a, d)
+}

exercises/hackerrank/interview_preparation_kit/arrays/ctci_array_left_rotation.testcases.json

@@ -0,0 +1,7 @@
+[
+    {"input": [1, 2, 3, 4, 5], "expected": [2, 3, 4, 5, 1]},
+    {"input": [2, 3, 4, 5, 1], "expected": [3, 4, 5, 1, 2]},
+    {"input": [3, 4, 5, 1, 2], "expected": [4, 5, 1, 2, 3]},
+    {"input": [4, 5, 1, 2, 3], "expected": [5, 1, 2, 3, 4]},
+    {"input": [5, 1, 2, 3, 4], "expected": [1, 2, 3, 4, 5]}
+]

exercises/hackerrank/interview_preparation_kit/arrays/ctci_array_left_rotation_test.go

@@ -0,0 +1,44 @@
+package hackerrank
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"gon.cl/algorithms/utils"
+)
+
+type TestCase struct {
+	Input    [][]int32 `json:"input"`
+	Expected int32     `json:"expected"`
+}
+
+var testCases []TestCase
+
+// You can use testing.T, if you want to test the code without benchmarking
+func setupSuite(t testing.TB) {
+	wd, _ := os.Getwd()
+	filepath := wd + "/ctci_array_left_rotation.testcases.json"
+	t.Log("Setup test cases from JSON: ", filepath)
+
+	var _, err = utils.LoadJSON(filepath, &testCases)
+	if err != nil {
+		t.Log(err)
+	}
+}
+
+func TestRotLeft(t *testing.T) {
+
+	setupSuite(t)
+
+	for _, tt := range testCases {
+		testname := fmt.Sprintf("hourglassSum(%v) => %v \n", tt.Input, tt.Expected)
+		t.Run(testname, func(t *testing.T) {
+
+			ans := hourglassSum(tt.Input)
+			assert.Equal(t, tt.Expected, ans)
+		})
+
+	}
+}