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InvertTree.java
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49 lines (43 loc) · 1.27 KB
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package recur;
public class InvertTree {
public static void main(String[] args) {
TreeNode left = new TreeNode(2,new TreeNode(1),new TreeNode(3));
TreeNode right = new TreeNode(7,new TreeNode(6),new TreeNode(9));
TreeNode root = new TreeNode(4,left,right);
System.out.println(root.toString());
TreeNode result = invertTree(root);
System.out.println(result.toString());
}
private static TreeNode invertTree(TreeNode root) {
if(root == null){
return null;
}
TreeNode tmp = root.right;
root.right = root.left;
root.left = tmp;
invertTree(root.left);
invertTree(root.right);
return root;
}
public static class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
public TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
@Override
public String toString() {
return "TreeNode{" +
"val=" + val +
", left=" + left +
", right=" + right +
'}';
}
}
}