传送门 题目大意 用2×1与2×2的小方块去填满一个2xn的长条形区域，问有多少种填法。 思路 很标准的dp。假设当前填到第i个位置，那么能继续往后推进的办法只有三种：竖着放一个2×1的方块，或者横着放两个2×1的方块、亦或者直接放一个2×2的方块。即，dp[n]的填法……
来自分类：做题
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