按键排序std :: unordered_map
问题描述：
如何按键对unordered_map进行排序?我需要打印按键排序的unordered_map.
How can I sort an unordered_map by key? I need to print an unordered_map sorted by key.
答
std::unordered_map<int, int> unordered;
std::map<int, int> ordered(unordered.begin(), unordered.end());
for(auto it = ordered.begin(); it != ordered.end(); ++it)
std::cout << it->second;