unordered_map如何输出

unordered_map可以使用迭代器来输出。通过遍历unordered_map的每个元素，可以逐个打印出键值对。下面是一个示例代码：

std::unordered_map<std::string, int> umap;
umap.insert(std::make_pair("apple", 5));
umap.insert(std::make_pair("banana", 3));
umap.insert(std::make_pair("orange", 2));

for(auto it = umap.begin(); it != umap.end(); ++it) {
    std::cout << "Key: " << it->first << ", Value: " << it->second << std::endl;
}

这段代码会输出unordered_map中每个键值对的键和值。注意，unordered_map的迭代器按照哈希表的顺序遍历，而不是插入的顺序。因此，输出的顺序可能与插入的顺序不一致。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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