添加 problem 101

Algorithms/101. Symmetric Tree/101. Symmetric Tree.go

@@ -0,0 +1,16 @@
+package leetcode
+
+/**
+ * Definition for a binary tree node.
+ * type TreeNode struct {
+ *     Val int
+ *     Left *TreeNode
+ *     Right *TreeNode
+ * }
+ */
+func isSymmetric(root *TreeNode) bool {
+	if root == nil {
+		return true
+	}
+	return isSameTree(invertTree(root.Left), root.Right)
+}

Algorithms/101. Symmetric Tree/101. Symmetric Tree_test.go

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+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question101 struct {
+	para101
+	ans101
+}
+
+// para 是参数
+// one 代表第一个参数
+type para101 struct {
+	one []int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans101 struct {
+	one bool
+}
+
+func Test_Problem101(t *testing.T) {
+
+	qs := []question101{
+
+		question101{
+			para101{[]int{3, 4, 4, 5, NULL, NULL, 5, 6, NULL, NULL, 6}},
+			ans101{true},
+		},
+
+		question101{
+			para101{[]int{1, 2, 2, NULL, 3, 3}},
+			ans101{true},
+		},
+
+		question101{
+			para101{[]int{}},
+			ans101{true},
+		},
+
+		question101{
+			para101{[]int{1}},
+			ans101{true},
+		},
+
+		question101{
+			para101{[]int{1, 2, 3}},
+			ans101{false},
+		},
+
+		question101{
+			para101{[]int{1, 2, 2, 3, 4, 4, 3}},
+			ans101{true},
+		},
+
+		question101{
+			para101{[]int{1, 2, 2, NULL, 3, NULL, 3}},
+			ans101{false},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 101------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans101, q.para101
+		fmt.Printf("【input】:%v      ", p)
+		rootOne := Ints2TreeNode(p.one)
+		fmt.Printf("【output】:%v      \n", isSymmetric(rootOne))
+	}
+	fmt.Printf("\n\n\n")
+}

Algorithms/101. Symmetric Tree/README.md

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+# [101. Symmetric Tree](https://leetcode.com/problems/symmetric-tree/)
+
+## 题目
+
+
+Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).
+
+For example, this binary tree [1,2,2,3,4,4,3] is symmetric:
+
+
+```c
+    1
+   / \
+  2   2
+ / \ / \
+3  4 4  3
+```
+
+But the following [1,2,2,null,3,null,3] is not:
+
+```c
+    1
+   / \
+  2   2
+   \   \
+   3    3
+```
+
+Note:   
+
+Bonus points if you could solve it both recursively and iteratively.
+
+## 题目大意
+
+这一题要求判断 2 颗树是否是左右对称的。这道题是几道题的综合题。将根节点的左字数反转二叉树，然后再和根节点的右节点进行比较，是否完全相等。
+
+反转二叉树是第 226 题。判断 2 颗树是否完全相等是第 100 题。
+
+