hihocoder #1499 : A Box of Coins 貪心

描述 Little Hi has a box which consists of 2xN cells as illustrated below.c++ +----+----+----+----+----+----+ | A1 | A2 | A3 | A4 | .. | AN | +----+----+----+----+----+----+ | B1 | B2 | B3 | B4 | .. | B
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