排列组合,怎么发现有重复的和避免出现重复计算的情况
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![排列组合,怎么发现有重复的和避免出现重复计算的情况](/uploads/image/z/11289673-1-3.jpg?t=%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%2C%E6%80%8E%E4%B9%88%E5%8F%91%E7%8E%B0%E6%9C%89%E9%87%8D%E5%A4%8D%E7%9A%84%E5%92%8C%E9%81%BF%E5%85%8D%E5%87%BA%E7%8E%B0%E9%87%8D%E5%A4%8D%E8%AE%A1%E7%AE%97%E7%9A%84%E6%83%85%E5%86%B5)
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