我们可以使用以下不同的方式遍历 map 和unordered_map。 使用基于范围的for循环 地图 // CPP program to traverse a map using range // based for loop #include <bits/stdc++.h> using namespace std; int main() { int arr[] = { 1, 1, 2, 1, 1, 3, 4, 3 }; int n = sizeof(arr) ...
std::cout << " std::map " << map_traverse_us << " us\n"; std::cout << " std::ext/hash_map " << hash_map_traverse_us << " us\n"; std::cout << "std::tr1::unordered_map " << unordered_map_traverse_us << " us\n"; std::cout << "\n"; std::cout << " find...
unordered_map的迭代器是一个指针,指向这个元素,通过迭代器来取得它的值。 1unordered_map<Key,T>::iteratorit;2(*it).first;// the key value (of type Key)3(*it).second;// the mapped value (of type T)4(*it);// the "element value" (of type pair<const Key,T>) 它的键值分别是迭代器...
在英语口语交流中,我们通常会说: “In C++, we often use iterators to traverse unordered maps. This code block here is going through each key-value pair in the unordered map and checking if the value matches a target value. If a match is found, it updates the value to a new one.” (...
I'm not english native, so my explanation can be some what weird. The simulation function below reads the cells inside the map, breed the cell if it's active and insert inactive cells into the unordered_map named "simulation". I tried to traverse the unordered_map while inserting new node...
Timer traverse unordered_set: spend 180 ms sum: 49999995000000 Timer traverse unordered_map: spend 182 ms 分析与总结 std::vector 优势:由于内存连续,缓存命中率高,遍历速度极快。 场景:适合大量数据的顺序访问和遍历。 std::set和std::map 优势:使用红黑树实现,有序存储,插入、删除和查找性能稳定。
{ // 创建一个 unordered_map 容器并初始化 std::unordered_map<std::string, int> myMap; myMap["apple"] = 5; myMap["banana"] = 10; myMap["cherry"] = 15; // 使用迭代器遍历 unordered_map std::cout << "Using iterator to traverse unordered_map:" << std::...
In my code given a vector nums = [100,4,200,1,3,2] , for this I added all elements into hashmap , and then i tried to do some simple check , for each element inside hashmap , but , due to that or some other reason, its not able to traverse properly for all elements and ...
//unordered_map traverse { string_unordered_map::iterator it(sunordered_map.begin()); string_unordered_map::iterator ite(sunordered_map.end()); start = current_usec(); for (int i = 0; it != ite; ++it) { i++; } end = current_usec(); unordered_map_traverse_us ...
本文整理匯總了C++中unordered_map::clear方法的典型用法代碼示例。如果您正苦於以下問題:C++ unordered_map::clear方法的具體用法?C++ unordered_map::clear怎麽用?C++ unordered_map::clear使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類unordered_map的用法示例。