规范格式

leetcode/0147.Insertion-Sort-List/147. Insertion Sort List.go

@@ -0,0 +1,36 @@
+package leetcode
+
+import (
+	"github.com/halfrost/LeetCode-Go/structures"
+)
+
+// ListNode define
+type ListNode = structures.ListNode
+
+/**
+ * Definition for singly-linked list.
+ * type ListNode struct {
+ *     Val int
+ *     Next *ListNode
+ * }
+ */
+func insertionSortList(head *ListNode) *ListNode {
+	if head == nil {
+		return head
+	}
+	newHead := &ListNode{Val: 0, Next: nil} // 这里初始化不要直接指向 head，为了下面循环可以统一处理
+	cur := head
+	pre := newHead
+	next := &ListNode{Val: 0, Next: nil}
+	for cur != nil {
+		next = cur.Next
+		for pre.Next != nil && pre.Next.Val < cur.Val {
+			pre = pre.Next
+		}
+		cur.Next = pre.Next
+		pre.Next = cur
+		pre = newHead // 归位，重头开始
+		cur = next
+	}
+	return newHead.Next
+}

leetcode/0147.Insertion-Sort-List/147. Insertion Sort List_test.go

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+package leetcode
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/halfrost/LeetCode-Go/structures"
+)
+
+type question147 struct {
+	para147
+	ans147
+}
+
+// para 是参数
+// one 代表第一个参数
+type para147 struct {
+	one []int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans147 struct {
+	one []int
+}
+
+func Test_Problem147(t *testing.T) {
+
+	qs := []question147{
+
+		question147{
+			para147{[]int{4, 2, 1, 3}},
+			ans147{[]int{1, 2, 3, 4}},
+		},
+		question147{
+			para147{[]int{1}},
+			ans147{[]int{1}},
+		},
+
+		question147{
+			para147{[]int{-1, 5, 3, 4, 0}},
+			ans147{[]int{-1, 0, 3, 4, 5}},
+		},
+
+		question147{
+			para147{[]int{}},
+			ans147{[]int{}},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 147------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans147, q.para147
+		fmt.Printf("【input】:%v       【output】:%v\n", p, structures.List2Ints(insertionSortList(structures.Ints2List(p.one))))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0147.Insertion-Sort-List/README.md

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+# [147. Insertion Sort List](https://leetcode.com/problems/insertion-sort-list/)
+
+## 题目
+
+Sort a linked list using insertion sort.
+
+![](https://upload.wikimedia.org/wikipedia/commons/0/0f/Insertion-sort-example-300px.gif)
+
+A graphical example of insertion sort. The partial sorted list (black) initially contains only the first element in the list.
+With each iteration one element (red) is removed from the input data and inserted in-place into the sorted list
+ 
+
+Algorithm of Insertion Sort:
+
+Insertion sort iterates, consuming one input element each repetition, and growing a sorted output list.
+At each iteration, insertion sort removes one element from the input data, finds the location it belongs within the sorted list, and inserts it there.
+It repeats until no input elements remain.
+
+Example 1:
+
+```c
+Input: 4->2->1->3
+Output: 1->2->3->4
+```
+
+Example 2:
+
+```c
+Input: -1->5->3->4->0
+Output: -1->0->3->4->5
+```
+
+## 题目大意
+
+链表的插入排序
+
+## 解题思路
+
+按照题意做即可。