It probably won't help much but before you append to the queue you can check if the node.val >= sum and skip the append. Would only apply if our node values where always >= 0 though.
That's a very good way to work effectively. Thanks a lot.
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It probably won't help much but before you append to the queue you can check if the node.val >= sum and skip the append. Would only apply if our node values where always >= 0 though.
That's a very good way to work effectively. Thanks a lot.