Java | Leetcode Java题解之第538题把二叉搜索树转换为累加树
题目：
题解：
class Solution {
public TreeNode convertBST(TreeNode root) {
int sum = 0;
TreeNode node = root;
while (node != null) {
if (node.right == null) {
sum += node.val;
node.val = sum;
node = node.left;
} else {
TreeNode succ = getSuccessor(node);
if (succ.left == null) {
succ.left = node;
node = node.right;
} else {
succ.left = null;
sum += node.val;
node.val = sum;
node = node.left;
}
}
}
return root;
}
public TreeNode getSuccessor(TreeNode node) {
TreeNode succ = node.right;
while (succ.left != null && succ.left != node) {
succ = succ.left;
}
return succ;
}
}原文地址：https://blog.csdn.net/m0_57195758/article/details/143498046
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