#include <unordered_set> int main() { // 创建一个整数类型的 unordered_set std::unordered_set<int> uset; // 插入元素 uset.insert(10); uset.insert(20); uset.insert(30); // 打印 unordered_set 中的元素 std::cout << "Elements in uset: "; for (int elem : uset) { std::cout...
1,5,7,9};// 使用迭代器访问unordered_set中的元素for(autoit=my_set.begin();it!=my_set.end();++it)std::cout<<*it<<" ";// 检查unordered_set是否包含元素if(my_set.find(5)!=my_set.end())std::cout<<"5 is in my_set";return0;}...
下面是一个使用emplace_hint()函数在unordered_set中插入元素的示例代码: #include<iostream>#include<unordered_set>usingnamespacestd;intmain(){unordered_set<int>mySet;autoit=mySet.begin();it=mySet.emplace_hint(it,1);it=mySet.emplace_hint(it,2);it=mySet.emplace_hint(mySet.end(),3);cout<<...
如何在Dev-Cpp中使用C++11中的函数:stoi、to_string、unordered_map、unordered_set、auto,程序员大本营,技术文章内容聚合第一站。
set<datatype>setname; C++ Copy 以下示例演示set的应用。 // CPP program to demonstrate insert and// delete in set#include<bits/stdc++.h>usingnamespacestd;// Driver codeintmain(){// set declareset<int>s;// Elements added to sets.insert(12);s.insert(10);s.insert(2);//...
This post will discuss how to print a std::set or std::unordered_set in C++. 1. Using std::copy function The idea is to copy the set’s contents to the output stream (which happens to be std::cout here) by using std::copy, which takes an output iterator std::ostream_iterator. ...
std::unordered_set<int> my_set; 向unordered_set中添加元素: 代码语言:cpp 复制 my_set.insert(10); my_set.insert(20); my_set.insert(30); 查找元素: 代码语言:cpp 复制 if (my_set.find(20) != my_set.end()) { std::cout << "Element 20 found in the set."<< std::endl; } else...
在MSVC2017中的unordered_set实现,默认的\alpha大小为1.0, 我们可以通过void max_load_factor(float ml)函数来调整。 迭代器的有效性 cppreference中给出了关于迭代器有效性的表格。我们还是以MSVC2017的实现作为说明。 在MSVC2017中返回的unordered_set迭代器,返回的实际上是_List(回顾上文)的迭代器。
Edit & run on cpp.sh Output:myset has hat myset has no sunglasses myset has suit myset has no t-shirt Complexity Average case: constant. Worst case: linear in container size.Iterator validity No changes.See also unordered_set::find Get iterator to element (public member function) unordere...
__cpp_lib_constexpr_containers202502L(C++26)constexprstd::unordered_set Example Run this code #include <iostream>#include <unordered_set>voidprint(constauto&set){for(constauto&elem:set)std::cout<<elem<<' ';std::cout<<'\n';}intmain(){std::unordered_set<int>mySet{2,7,1,8,2,8};...