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112. 路径总和 ​

js
/**
 * @param {TreeNode} root
 * @param {number} targetSum
 * @return {boolean}
 */
var hasPathSum = function (root, targetSum) {
  if (!root) return false;
  if (!root.left && !root.right && targetSum === root.val) return true;

  return (
    hasPathSum(root.left, targetSum - root.val) ||
    hasPathSum(root.right, targetSum - root.val)
  );
};
/**
 * @param {TreeNode} root
 * @param {number} targetSum
 * @return {boolean}
 */
var hasPathSum = function (root, targetSum) {
  if (!root) return false;
  if (!root.left && !root.right && targetSum === root.val) return true;

  return (
    hasPathSum(root.left, targetSum - root.val) ||
    hasPathSum(root.right, targetSum - root.val)
  );
};