std::unordered_map 怎么查找

std::unordered_map 可以使用 find() 函数进行查找，例如：

std::unordered_map<std::string, int> myMap;
myMap["apple"] = 1;
myMap["banana"] = 2;

auto it = myMap.find("apple");
if (it != myMap.end()) {
std::cout << "apple is found with value " << it->second << std::endl;
} else {
std::cout << "apple is not found" << std::endl;
}

输出结果为：

apple is found with value 1