slow but concise code

  • 0

    the first function is responsible for start from different nodes, the second funtion is responsible for finding the number of solutions from a certain assigned node.

    int count = 0;
    public int pathSum(TreeNode root, int sum) {
        if(root == null) return 0;
        count = 0;
        find(root, sum);
        return count + pathSum(root.left, sum) + pathSum(root.right, sum);
    public void find(TreeNode node, int val){
        if(node == null) return;
        if(node.val == val){
        find(node.left, val - node.val);
        find(node.right, val - node.val);

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