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solution.ts
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solution.ts
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class TreeNode {
val: number
left: TreeNode | null
right: TreeNode | null
constructor (val?: number, left?: TreeNode | null, right?: TreeNode | null) {
this.val = (val === undefined ? 0 : val);
this.left = (left === undefined ? null : left);
this.right = (right === undefined ? null : right);
}
}
function convertBST (root: TreeNode | null): TreeNode | null {
if (root === null) {
return null;
}
let greaterSum = 0;
function traversal (root:TreeNode) {
root.right !== null && traversal(root.right);
root.val += greaterSum;
greaterSum = root.val;
root.left !== null && traversal(root.left);
}
traversal(root);
return root;
}