unordered_map<string, vector<string>>letters{//声母--韵母 组合{"B",{"a","o","i","u","ai","ei","ao","iao","ie","an","ian","en","in","ang","eng","ing"}}, {"P",{"a","o","i","u","ai","ei","ao","iao","ou","ie","an","ian","en","in","ang","...
// 创建一个 unordered_map,键为 int,值为 string std::unordered_map<int, std::string>myMap; // 插入一些键值对 myMap[1]="one"; myMap[2]="two"; myMap[3]="three"; // 打印所有元素 for(constauto&pair:myMap){ std::cout<<"Key: "<<pair.first<<", Value: "<<pair.second<<std...
//使用const char*,key为10000000时:unorder_mapcharcreate cost11.7611unorder_mapcharfind cost1.55619unorder_map std::stringcreate cost13.5376unorder_map std::stringfind cost2.33906//使用struct c_string,key为10000000时:unorder_mapcharcreate cost7.35524unorder_mapcharfind cost1.60826unorder_map std::stringcre...
#include <iostream> #include <string> #include <random> #include <unordered_map> #include <windows.h> using namespace std; using std::string; using std::random_device; using std::default_random_engine; string StrRand(int length) { char tmp; string buffer; random_device rd; default_rando...
头文件:include <unordered_map> 下面的代码中都包含了std:using namespace std;,也包含了头文件#include<string> 创建map对象 代码语言:javascript 代码运行次数:0 运行 AI代码解释 typedef unordered_map<string, int> strIntMap; strIntMap map1; strIntMap map2({ {"Tom", 80}, {"Lucy...
unordered_map<int, string> myMap; myMap.reserve(1000); // 预先分配1000个桶 复制代码使用成员函数at和size代替find和end:在遍历unordered_map时,应该使用成员函数at和size来访问元素,而不是每次使用find函数和end迭代器来判断元素是否存在。unordered_map<int, string> myMap; if (myMap.find(1) != my...
multimap<string, int> multiMap; cout << "multimap中的key值遍历(升序红黑树实现):" << endl; multiMap.insert({"B", 22}); multiMap.insert({"B", 11}); multiMap.insert({"A", 11}); multiMap.insert({"D", 44}); multiMap.insert({"C", 33}); for (auto& m : multiMap) cout << ...
当key可以强转成整形时(比如负数,指针等),用缺省的仿函数即可。当key是string这种不能强转成整形的类型时,就要手动写一个转换成整形的仿函数。上方是取string的第一个字符进行返回。同时也要手动传入这个仿函数。 这种取首字符的方法不是很好,下面是另一种字符串哈希算法: ...
// unordered_map::insert#include<iostream>#include<string>#include<unordered_map>usingnamespacestd;voiddisplay(unordered_map<string,double>myrecipe,stringstr){cout<<str<<endl;for(auto&x:myrecipe)cout<<x.first<<": "<<x.second<<endl;cout<<endl;}intmain(){unordered_map<string,double>myrecip...
#include<string> #include<iostream> #include<map> using namespace std; struct person { string name; int age; person(string name, int age) { this->name = name; this->age = age; } bool operator < (const person& p) const {