1×C(7,2)+2×C(6,2)+3×C(5,2)+4×C(4,2)+5×C(3,2)+6×C(2,2)
这个虽然case多了一点,但比我的简单。
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1×C(7,2)+2×C(6,2)+3×C(5,2)+4×C(4,2)+5×C(3,2)+6×C(2,2)
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