Merge pull request #1860 from tahsintunan/929

create 929. Unique Email Addresses

Author: tahsintunan

go/0002-add-two-numbers.go.go

@@ -0,0 +1,34 @@
+func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode {
+	var dummy = new(ListNode)
+	var l3 **ListNode = &dummy
+	var carry int
+	list1 := l1
+	list2 := l2
+
+	for (list1 != nil) || (list2 != nil) {
+		l3 = &((*l3).Next)
+		*l3 = new(ListNode)
+		var sum int
+
+		if list1 != nil {
+			sum += list1.Val
+			list1 = list1.Next
+		}
+
+		if list2 != nil {
+			sum += list2.Val
+			list2 = list2.Next
+		}
+
+		(*l3).Val = (sum + carry) % 10
+		carry = (sum + carry) / 10
+	}
+
+	if carry > 0 {
+		l3 = &((*l3).Next)
+		*l3 = new(ListNode)
+		(*l3).Val = carry
+	}
+
+	return dummy.Next
+}

go/0002-add-two-numbers.go.txt

@@ -0,0 +1,27 @@
+import "strings"
+
+func numUniqueEmails(emails []string) int {
+	ans, uniqueAddressMap := 0, make(map[string]struct{})
+	for _, email := range emails {
+		address := uniqueAddress(email)
+		if _, ok := uniqueAddressMap[address]; !ok {
+			ans++
+			uniqueAddressMap[address] = struct{}{}
+		}
+	}
+	return ans
+}
+
+func uniqueAddress(email string) string {
+	parts := strings.Split(email, "@")
+	local, domain := parts[0], parts[1]
+
+	local = strings.ReplaceAll(local, ".", "")
+
+	plusIndex := strings.Index(local, "+")
+	if plusIndex >= 0 {
+		local = local[:plusIndex]
+	}
+
+	return local + "@" + domain
+}