unordered_map<string, int> um1({ {"apple", 1}, {"lemon", 2}}); unordered_map<string, int> um3(um1.begin(), um1.end()); // 使用迭代器拷贝构造um1容器某段区间的复制品 简单的使用一下: #include <iostream> #include <vector> #include
unordered_map<int, string> mymap; (2)使用n个元素构造unordered_map: unordered_map<int, string> mymap = {{1, "one"}, {2, "two"}, {3, "three"}}; (3)使用给定的范围构造unordered_map: 1 vector<pair<int, string>> myVector = {{1, "one"}, {2, "two"}, {3, "three"}};...
int main() { std::vector<int> nums = {10, 20, 20, 10, 10, 30, 50, 10, 20}; std::unordered_map<int, int> countMap; for (int num : nums) { countMap[num]++; // operator[]自动插入默认值0后加1 } std::cout << "元素计数:" << std::endl; for (const auto& p : count...
map<int, string> myMap; // 插入元素 myMap.insert(make_pair(1,"One")); //遍历元素 for (constauto& pair : myMap) { std::cout <<"Key: " << pair.first <<", Value: " << pair.second << std::endl; } // 删除元素 myMap.erase(2); // 查找元素 map<int, string>::iterator...
#include <iostream> #include <unordered_map> #include <vector> #include <string> int main() { std::unordered_map<int, std::vector<std::string>> map = {{1, {"one"}}, {2, {"two"}}, {3, {"three"}}}; for (const auto& pair...
classUndergroundSystem{unordered_map<string,unordered_map<string,vector<int>>>Station_time_n;// 起点:终点;2个int(总时间,人数)unordered_map<int,pair<string,int>>id_startStation_t;// 乘客id,(起点,出发时刻)string startStation;int time;public:UndergroundSystem(){}voidcheckIn(int id,string statio...
#include <iostream> #include <unordered_map> #include <vector> using namespace std; int main() { vector<pair<string, int>> vec = {{"apple", 1}, {"banana", 2}}; unordered_map<string, int> myMap(vec.begin(), vec.end()); // 从 vector 初始化 for (const auto& pair : myMap...
int main() { std::map<std::string, int> scoreMap; scoreMap["Zhang"] = 85; scoreMap["Li"] = 92; scoreMap["Wang"] = 78; // 遍历时会按键的字母顺序输出 for (constauto& student : scoreMap) { std::cout << student.first << ": " << student.second << std::endl; ...
unordered_map<int, string> myMap; for(auto& pair : myMap) { // 使用 pair.first 和 pair.second 访问键值对 } 复制代码避免频繁拷贝:在遍历unordered_map时,如果需要修改值,应该使用引用或指针避免频繁拷贝。unordered_map<int, vector<int>> myMap; for(auto& pair : myMap) { vector<int>& ...
#include <iostream> #include <vector> #include <unordered_map> using namespace std; class Myclass { public: int first; vector<int> second; // 重载等号,判断两个Myclass类型的变量是否相等 bool operator== (const Myclass &other) const { return first == other.first && second == other.secon...