some more problems solved

merge-two-sorted-lists/sol.go

@@ -0,0 +1,33 @@
+package main
+
+type ListNode struct {
+	Val  int
+	Next *ListNode
+}
+
+/**
+ * Definition for singly-linked list.
+ * type ListNode struct {
+ *     Val int
+ *     Next *ListNode
+ * }
+ */
+func mergeTwoLists(list1 *ListNode, list2 *ListNode) *ListNode {
+	next1, next2 := list1, list2
+	head := &ListNode{
+		Val:  -1,
+		Next: nil,
+	}
+	current := head
+	for next1 != nil || next2 != nil {
+		if next2 == nil || (next1 != nil && next1.Val < next2.Val) {
+			current.Next = next1
+			next1 = next1.Next
+		} else {
+			current.Next = next2
+			next2 = next2.Next
+		}
+		current = current.Next
+	}
+	return head.Next
+}