[FEAT] Base Golang omni

code_to_optimize/go/algorithms.go

@@ -0,0 +1,195 @@
+package sample
+
+import "strings"
+
+func TwoSum(nums []int, target int) [2]int {
+	for i := 0; i < len(nums); i++ {
+		for j := i + 1; j < len(nums); j++ {
+			if nums[i]+nums[j] == target {
+				return [2]int{i, j}
+			}
+		}
+	}
+	return [2]int{-1, -1}
+}
+
+func FindDuplicates(nums []int) []int {
+	var result []int
+	for i := 0; i < len(nums); i++ {
+		found := false
+		for j := 0; j < i; j++ {
+			if nums[i] == nums[j] {
+				found = true
+				break
+			}
+		}
+		if found {
+			alreadyAdded := false
+			for _, r := range result {
+				if r == nums[i] {
+					alreadyAdded = true
+					break
+				}
+			}
+			if !alreadyAdded {
+				result = append(result, nums[i])
+			}
+		}
+	}
+	return result
+}
+
+func UniqueElements(nums []int) []int {
+	var result []int
+	for _, num := range nums {
+		found := false
+		for _, r := range result {
+			if r == num {
+				found = true
+				break
+			}
+		}
+		if !found {
+			result = append(result, num)
+		}
+	}
+	return result
+}
+
+func MostFrequent(nums []int) int {
+	if len(nums) == 0 {
+		return 0
+	}
+
+	maxCount := 0
+	maxNum := nums[0]
+
+	for _, num := range nums {
+		count := 0
+		for _, other := range nums {
+			if other == num {
+				count++
+			}
+		}
+		if count > maxCount {
+			maxCount = count
+			maxNum = num
+		}
+	}
+	return maxNum
+}
+
+func Intersection(a, b []int) []int {
+	var result []int
+	for _, x := range a {
+		for _, y := range b {
+			if x == y {
+				already := false
+				for _, r := range result {
+					if r == x {
+						already = true
+						break
+					}
+				}
+				if !already {
+					result = append(result, x)
+				}
+			}
+		}
+	}
+	return result
+}
+
+func MergeSortedSlices(a, b []int) []int {
+	var result []int
+	result = append(result, a...)
+	result = append(result, b...)
+
+	for i := 0; i < len(result); i++ {
+		for j := i + 1; j < len(result); j++ {
+			if result[j] < result[i] {
+				result[i], result[j] = result[j], result[i]
+			}
+		}
+	}
+	return result
+}
+
+func LongestCommonPrefix(strs []string) string {
+	if len(strs) == 0 {
+		return ""
+	}
+
+	prefix := strs[0]
+	for _, s := range strs[1:] {
+		for !strings.HasPrefix(s, prefix) {
+			prefix = prefix[:len(prefix)-1]
+			if prefix == "" {
+				return ""
+			}
+		}
+	}
+	return prefix
+}
+
+func MaxSubarraySum(nums []int) int {
+	if len(nums) == 0 {
+		return 0
+	}
+
+	maxSum := nums[0]
+	for i := 0; i < len(nums); i++ {
+		for j := i; j < len(nums); j++ {
+			sum := 0
+			for k := i; k <= j; k++ {
+				sum += nums[k]
+			}
+			if sum > maxSum {
+				maxSum = sum
+			}
+		}
+	}
+	return maxSum
+}
+
+func IsPrime(n int) bool {
+	if n < 2 {
+		return false
+	}
+	for i := 2; i < n; i++ {
+		if n%i == 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func PrimesUpTo(limit int) []int {
+	var primes []int
+	for i := 2; i <= limit; i++ {
+		if IsPrime(i) {
+			primes = append(primes, i)
+		}
+	}
+	return primes
+}
+
+func GCD(a, b int) int {
+	if a < 0 {
+		a = -a
+	}
+	if b < 0 {
+		b = -b
+	}
+	for b != 0 {
+		a, b = b, a%b
+	}
+	return a
+}
+
+func LCM(a, b int) int {
+	if a == 0 || b == 0 {
+		return 0
+	}
+	return a / GCD(a, b) * b
+}

code_to_optimize/go/algorithms_test.go

@@ -0,0 +1,165 @@
+package sample
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestTwoSum(t *testing.T) {
+	got := TwoSum([]int{2, 7, 11, 15}, 9)
+	if got != [2]int{0, 1} {
+		t.Errorf("TwoSum([2,7,11,15], 9) = %v, want [0,1]", got)
+	}
+
+	got = TwoSum([]int{1, 2, 3}, 10)
+	if got != [2]int{-1, -1} {
+		t.Errorf("TwoSum no match = %v, want [-1,-1]", got)
+	}
+}
+
+func TestFindDuplicates(t *testing.T) {
+	got := FindDuplicates([]int{1, 2, 3, 2, 4, 3, 5})
+	want := []int{2, 3}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("FindDuplicates = %v, want %v", got, want)
+	}
+
+	got = FindDuplicates([]int{1, 2, 3})
+	if len(got) != 0 {
+		t.Errorf("expected no duplicates, got %v", got)
+	}
+}
+
+func TestUniqueElements(t *testing.T) {
+	got := UniqueElements([]int{1, 2, 2, 3, 3, 3, 4})
+	want := []int{1, 2, 3, 4}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("UniqueElements = %v, want %v", got, want)
+	}
+}
+
+func TestMostFrequent(t *testing.T) {
+	got := MostFrequent([]int{1, 2, 2, 3, 3, 3, 2, 2})
+	if got != 2 {
+		t.Errorf("MostFrequent = %d, want 2", got)
+	}
+
+	got = MostFrequent([]int{})
+	if got != 0 {
+		t.Errorf("MostFrequent empty = %d, want 0", got)
+	}
+}
+
+func TestIntersection(t *testing.T) {
+	got := Intersection([]int{1, 2, 3, 4}, []int{3, 4, 5, 6})
+	want := []int{3, 4}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("Intersection = %v, want %v", got, want)
+	}
+
+	got = Intersection([]int{1, 2}, []int{3, 4})
+	if len(got) != 0 {
+		t.Errorf("expected empty intersection, got %v", got)
+	}
+}
+
+func TestMergeSortedSlices(t *testing.T) {
+	got := MergeSortedSlices([]int{1, 3, 5}, []int{2, 4, 6})
+	want := []int{1, 2, 3, 4, 5, 6}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("MergeSortedSlices = %v, want %v", got, want)
+	}
+}
+
+func TestLongestCommonPrefix(t *testing.T) {
+	got := LongestCommonPrefix([]string{"flower", "flow", "flight"})
+	if got != "fl" {
+		t.Errorf("LongestCommonPrefix = %q, want \"fl\"", got)
+	}
+
+	got = LongestCommonPrefix([]string{"dog", "racecar", "car"})
+	if got != "" {
+		t.Errorf("LongestCommonPrefix = %q, want \"\"", got)
+	}
+
+	got = LongestCommonPrefix([]string{})
+	if got != "" {
+		t.Errorf("LongestCommonPrefix empty = %q, want \"\"", got)
+	}
+}
+
+func TestMaxSubarraySum(t *testing.T) {
+	got := MaxSubarraySum([]int{-2, 1, -3, 4, -1, 2, 1, -5, 4})
+	if got != 6 {
+		t.Errorf("MaxSubarraySum = %d, want 6", got)
+	}
+
+	got = MaxSubarraySum([]int{-1, -2, -3})
+	if got != -1 {
+		t.Errorf("MaxSubarraySum all negative = %d, want -1", got)
+	}
+
+	got = MaxSubarraySum([]int{})
+	if got != 0 {
+		t.Errorf("MaxSubarraySum empty = %d, want 0", got)
+	}
+}
+
+func TestIsPrime(t *testing.T) {
+	primes := []int{2, 3, 5, 7, 11, 13, 17, 19, 23}
+	for _, p := range primes {
+		if !IsPrime(p) {
+			t.Errorf("IsPrime(%d) = false, want true", p)
+		}
+	}
+
+	nonPrimes := []int{0, 1, 4, 6, 8, 9, 10, 15}
+	for _, n := range nonPrimes {
+		if IsPrime(n) {
+			t.Errorf("IsPrime(%d) = true, want false", n)
+		}
+	}
+}
+
+func TestPrimesUpTo(t *testing.T) {
+	got := PrimesUpTo(20)
+	want := []int{2, 3, 5, 7, 11, 13, 17, 19}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("PrimesUpTo(20) = %v, want %v", got, want)
+	}
+}
+
+func TestGCD(t *testing.T) {
+	tests := []struct {
+		a, b, want int
+	}{
+		{12, 8, 4},
+		{7, 13, 1},
+		{0, 5, 5},
+		{-12, 8, 4},
+	}
+
+	for _, tc := range tests {
+		got := GCD(tc.a, tc.b)
+		if got != tc.want {
+			t.Errorf("GCD(%d, %d) = %d, want %d", tc.a, tc.b, got, tc.want)
+		}
+	}
+}
+
+func TestLCM(t *testing.T) {
+	tests := []struct {
+		a, b, want int
+	}{
+		{4, 6, 12},
+		{7, 13, 91},
+		{0, 5, 0},
+	}
+
+	for _, tc := range tests {
+		got := LCM(tc.a, tc.b)
+		if got != tc.want {
+			t.Errorf("LCM(%d, %d) = %d, want %d", tc.a, tc.b, got, tc.want)
+		}
+	}
+}