less<存储数据的类型>:使用大顶堆
greater<存储数据类型>:使用小顶堆
Set:是一个集合容器 其中所包含的元素是唯一的,集合中的元素按一定的顺序排序
元素插入过程按照排序规则插入,所以不能插入指定位置
set采用红黑树变体的数据结构,红黑树属于平衡二叉树,其插入和删除操作往往比vector快
set不能直接存取元素 不能用.at(pos)以及[]运算符读取或者改变pos位置的数据
multiset与set的区别:
set支持唯一键值,每个元素只能出现一次,而multiset中同一个值可以出现多次
不可以直接修改set的或者multiset容器中的元素值,因为自动排序 如果希望修改一个元素的值 必须删除所有元素在插入新元素
set集合是默认从小到大排序的
对于复杂的数据类型 如何进行排序
如何进行自定义数据类型的比较?涉及仿函数以及函数对象
利用仿函数 通过class类的成员变量进行排序
仿函数就是写一个类 重载了函数操作运算符,其中greator<>,以及less<>都是函数的函数对象
仿函数的用法 重点学习
pair是一个对组
!!如何判断set.insert()函数的放回值 利用译队(pair)来进行set的插入正确与否的判断
set的查找
set.find(ele)用来查找ele元素 返回的是指向ele元素的迭代器
st.couunt(ele) 用来返回容器中值为ele元素的个数,对于set来说 要么是0,要么是1,但是对于muliset而言 值可能大于1
set.lower_bound(ele) 用来返回第一个元素≥ele的迭代器的位置
set.upper_bound(ele) 用来返回第一个元素>ele的迭代器
注意lower_bound以及upper_bound的返回迭代器的差别
set.equal_range(ele) 用来返回容器与ele相等的上下限的两个迭代器,上限是闭区间 下限是开区间 [beg,end)
以上函数返回两个迭代器 这两个迭代器被封装在pair中
pari的使用!!需要理解
multiset值可以出现多次 因为该容器是自动排序的 所以希望修改一个元素的值 必须先删除原有的元素 然后在插入新的元素
仿函数 :定义一个结构体 重载了函数定义运算符“()”的函数 我们称为仿函数
pair(first:元素插入的迭代器的位置,second:元素插入是否成功)
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C++容器类学习,学习容器类相关的基本用法
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