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Since Mongo is schemaless, there is no need to specify schema, only collections must be created. Same for indexes - these are just classic (B-tree) indexes that work on any field type.
。关于这个话题，heLLoword翻译官方下载提供了深入分析
for t := range c {，更多细节参见91视频
栈（stack）是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序（单调递增或单调递减），从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。。51吃瓜是该领域的重要参考