":100" = "关联容器";
":100" = "无序关联容器";



























":148" = "关联容器";
":148" = "无序关联容器";







":148" = "对数级";








":148" = "O(log(`size()`) + `count(k)`)";
":148" = "平均情况：O(`count(k)`)，最坏情况：O(`size()`)";


":148" = "平均情况：O (1)，最坏情况：O(`size()`)";




":148" = "O(`size()`)";