* 获取数字的第digit位（从右往左，0表示个位）
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，详情可参考同城约会
candidate.weight = 1.0 / distance to candidate
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。关于这个话题，服务器推荐提供了深入分析
{ 48, 16, 56, 24, 50, 18, 58, 26 },。同城约会对此有专业解读
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