Merge pull request neetcode-gh#1197 from razer96/21-Merge-Two-Sorted-…

…Lists.go

21-Merge-Two-Sorted-Lists go solution

go/21-Merge-Two-Sorted-Lists.go

@@ -0,0 +1,49 @@
+/**
+ * Definition for singly-linked list.
+ * type ListNode struct {
+ * Val int
+ * Next *ListNode
+ * }
+ */
+func mergeTwoLists(l1 *ListNode, l2 *ListNode) *ListNode {
+ if l1 == nil {
+ return l2
+ }
+
+ if l2 == nil {
+ return l1
+ }
+
+ ptr1, ptr2 := l1, l2
+
+ result := new(ListNode)
+
+ temp := result
+
+ for ptr1 != nil && ptr2 != nil {
+ if ptr1.Val < ptr2.Val {
+ temp.Next = ptr1
+ temp = temp.Next
+ ptr1 = ptr1.Next
+ } else {
+ temp.Next = ptr2
+ temp = temp.Next
+ ptr2 = ptr2.Next
+ }
+ }
+
+ for ptr1 != nil{
+ temp.Next = ptr1
+ temp = temp.Next
+ ptr1 = ptr1.Next
+ }
+
+ for ptr2 != nil{
+ temp.Next = ptr2
+ temp = temp.Next
+ ptr2 = ptr2.Next
+ }
+
+ result = result.Next
+ return result
+}