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Main.java
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Main.java
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package com.company;
class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
public class Main {
public static void main(String[] args) {
TreeNode a = new TreeNode(3);
TreeNode b = new TreeNode(2);
TreeNode c = new TreeNode(4);
TreeNode d = new TreeNode(1);
a.left = b;
a.right = c;
b.left = d;
}
int sum;
public TreeNode bstToGst(TreeNode root) {
dfs(root);
return root;
}
public void dfs(TreeNode node){
if(node == null) return;
dfs(node.right);
sum += node.val;
node.val = sum;
dfs(node.left);
}
}