添加 problem 328

Algorithms/328. Odd Even Linked List/328. Odd Even Linked List.go

@@ -0,0 +1,32 @@
+package leetcode
+
+/**
+ * Definition for singly-linked list.
+ * type ListNode struct {
+ *     Val int
+ *     Next *ListNode
+ * }
+ */
+
+func oddEvenList(head *ListNode) *ListNode {
+	oddHead := &ListNode{Val: 0, Next: nil}
+	odd := oddHead
+	evenHead := &ListNode{Val: 0, Next: nil}
+	even := evenHead
+
+	count := 1
+	for head != nil {
+		if count%2 == 1 {
+			odd.Next = head
+			odd = odd.Next
+		} else {
+			even.Next = head
+			even = even.Next
+		}
+		head = head.Next
+		count++
+	}
+	even.Next = nil
+	odd.Next = evenHead.Next
+	return oddHead.Next
+}

Algorithms/328. Odd Even Linked List/328. Odd Even Linked List_test.go

@@ -0,0 +1,72 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question328 struct {
+	para328
+	ans328
+}
+
+// para 是参数
+// one 代表第一个参数
+type para328 struct {
+	one []int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans328 struct {
+	one []int
+}
+
+func Test_Problem328(t *testing.T) {
+
+	qs := []question328{
+
+		question328{
+			para328{[]int{1, 4, 3, 2, 5, 2}},
+			ans328{[]int{1, 3, 5, 4, 2, 2}},
+		},
+
+		question328{
+			para328{[]int{1, 1, 2, 2, 3, 3, 3}},
+			ans328{[]int{1, 2, 3, 3, 1, 2, 3}},
+		},
+
+		question328{
+			para328{[]int{4, 3, 2, 5, 2}},
+			ans328{[]int{4, 2, 2, 3, 5}},
+		},
+
+		question328{
+			para328{[]int{1, 1, 1, 1, 1, 1}},
+			ans328{[]int{1, 1, 1, 1, 1, 1}},
+		},
+
+		question328{
+			para328{[]int{3, 1}},
+			ans328{[]int{3, 1}},
+		},
+
+		question328{
+			para328{[]int{1, 2, 3, 4, 5}},
+			ans328{[]int{1, 3, 5, 2, 4}},
+		},
+
+		question328{
+			para328{[]int{}},
+			ans328{[]int{}},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 328------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans328, q.para328
+		fmt.Printf("【input】:%v       【output】:%v\n", p, L2s(oddEvenList(S2l(p.one))))
+	}
+	fmt.Printf("\n\n\n")
+}

Algorithms/328. Odd Even Linked List/README.md

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+# [328. Odd Even Linked List](https://leetcode.com/problems/odd-even-linked-list/)
+
+## 题目
+
+Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about the node number and not the value in the nodes.
+
+You should try to do it in place. The program should run in O(1) space complexity and O(nodes) time complexity.
+
+Example 1:
+
+```c
+Input: 1->2->3->4->5->NULL
+Output: 1->3->5->2->4->NULL
+```
+
+Example 2:
+
+```c
+Input: 2->1->3->5->6->4->7->NULL
+Output: 2->3->6->7->1->5->4->NULL
+```
+
+Note:
+
+- The relative order inside both the even and odd groups should remain as it was in the input.
+- The first node is considered odd, the second node even and so on ...
+
+## 题目大意
+
+这道题和第 86 题非常类型。第 86 题是把排在某个点前面的小值放在一个链表中，排在某个点后端的大值放在另外一个链表中，最后 2 个链表首尾拼接一下就是答案。这道题思路也是一样的，分别把奇数和偶数都放在 2 个链表中，最后首尾拼接就是答案。