// 易错点3：处理最终结果为空的场景（比如num="10"，k=2）
Highest danger rate。关于这个话题，旺商聊官方下载提供了深入分析
，详情可参考爱思助手下载最新版本
2. 创建计数数组count，统计每个值出现次数，详情可参考safew官方下载
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