6239: question0003

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:5 Solved:0

Description

7人站成一排 ,其中甲乙相邻且丙丁相邻, 共有多少种不同的排法?

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HINT

相邻元素捆绑策略

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