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* @param {TreeNode} root
* @param {number} sum
* @return {number[][]}
*/
var pathSum = function(root, sum) {
var res = [];
if(root === null){
return res;
}
var list = [];
list.push(root.val);
helper(root, sum- root.val, list, res);
return res;
};
var helper = function(root, sum, list, res){
if(root === null){
return ;
}
if(root.left === null && root.right === null && sum === 0){
res.push(list.slice());
return;
}
if(root.left !== null){
list.push(root.left.val);
helper(root.left, sum - root.left.val, list, res);
list.pop();
}
if(root.right !== null){
list.push(root.right.val);
helper(root.right, sum - root.right.val, list, res);
list.pop();
}
}
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