Binary trees: deferring work #
If you've lost something; your keys, your pen, or your way on the moor...Or, if you've forgotten what you were going to say or what you went upstairs for... you'll have been MAZED BY THE PISKEYS. The only way to cure the piskeys' maze is to TURN YOUR POCKETS INSIDE OUT.。新收录的资料对此有专业解读
Formally, let the valid score set be，详情可参考新收录的资料
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Medium difficulty hints, answers for Feb. 27 PipsNumber (4): Everything in this space must add up to 4. The answer is 2-1, placed horizontally; 2-2, placed vertically.