add: go: 7-226

Author: poseidon-code

07-trees/00226-Invert_Binary_Tree/00226-invert_binary_tree.go

@@ -0,0 +1,81 @@
+// 226: Invert Binary Tree
+// https://leetcode.com/problems/invert-binary-tree/
+
+package main
+
+import "fmt"
+
+type TreeNode struct {
+    val any
+    left *TreeNode
+    right *TreeNode
+}
+
+type Tree struct {
+    root *TreeNode
+}
+
+func creator(values []any, root **TreeNode, i, n int) *TreeNode {
+    if n==0 {return nil}
+    if i<n {
+        temp := &TreeNode{values[i], nil, nil}
+        *root = temp
+        (*root).left = creator(values, &((*root).left), 2*i+1, n);
+        (*root).right = creator(values, &((*root).right), 2*i+2, n);
+    }
+    return *root;
+}
+
+func createTree(root **TreeNode, inputs []any) {
+    creator(inputs, root, 0, len(inputs))
+}
+
+func showTree(root *TreeNode) {
+    var q []*TreeNode;
+    var result [][]interface{}
+    var c []interface{}
+    if root==nil { fmt.Println("Empty !"); return; }
+    q = append(q, root)
+    q = append(q, nil)
+    for len(q)!=0 {
+        t := q[0]
+        q = q[1:]
+        if t==nil {
+            result = append(result, c)
+            c = make([]interface{}, 0)
+            if len(q) > 0 {q = append(q, nil)}
+        } else {
+            c = append(c, t.val)
+            if t.left!=nil {q = append(q, t.left)}
+            if t.right!=nil {q = append(q, t.right)}
+        }
+    }
+
+    fmt.Print("["); for _, x := range result {
+        fmt.Print("["); for _, y := range x {
+            if y==nil { fmt.Print("NULL,"); continue; }
+            fmt.Print(y,",")
+        }; fmt.Print("\b],")
+    }; fmt.Println("\b]")
+}
+
+// SOLUTION
+func invertTree(root *TreeNode) *TreeNode {
+    if root == nil {return root}
+	left := invertTree(root.left)
+	root.left = invertTree(root.right)
+	root.right = left
+    return root
+}
+
+func main() {
+    tree := Tree{}
+
+    // INPUT
+    tn := []any{4,2,7,1,3,6,9}
+    createTree(&tree.root, tn)
+
+    // OUTPUT
+    result := invertTree(tree.root)
+    showTree(result)
+}