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直接DP超时，加一个剪枝就16ms，太夸张了吧加判断了一下前2个字符串组成的字符集是否等于第3个字符串中的字符集。 看来测试数据中很多case不需要dp，就是判断一下字符集是否相等就可以了 Followed by:
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