Number (12): Everything in this space must add up to 12. The answer is 2-6, placed vertically; 6-5, placed horizontally.
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示例：nums = [2,1,2,4,3] → res = [4,2,4,-1,-1]。
Implementers shouldn't need to jump through these hoops. When you find yourself needing to relax or bypass spec semantics just to achieve reasonable performance, that's a sign something is wrong with the spec itself. A well-designed streaming API should be efficient by default, not require each runtime to invent its own escape hatches.