unordered_set is 是含有 Key 类型唯一对象集合的关联容器。搜索、插入和移除拥有平均常数时间复杂度。 在内部,元素并不以任何特别顺序排序,而是组织进桶中。元素被放进哪个桶完全依赖其值的哈希。这允许对单独元素的快速访问,因为哈希一旦确定,就准确指代元素被放入的桶。
请改用 <unordered_map> 和<unordered_set>。 比较运算符和 operator() 关联容器( 系列)现在要求其比较运算符具有可调用 const 的函数调用运算符。 现在比较运算符类声明中的以下代码无法进行编译: C++ 复制 bool operator()(const X& a, const X& b) 若要解决此错误,请将函数声明更改为: C++ 复制 ...
#include<unordered_set>,利用find() end()做判断 for (int x : nums) #include<unordered_set> using namespace std; class Solution { public: bool containsDuplicate(vector<int>& nums) { unordered_set<int> s; for (int x : nums) { if(s.find(x) != s.end()) return true; s.insert(x...
映射:unordered_map、unordered_multimap(相比 map 和 multimap,这俩采用 hash 实现) 集合:unordered_set、unordered_multiset(相比 set 和 multiset,这俩采用 hash 实现) 下面几个容器,C++ 标准【没有】包含,但包含在某些知名的 STL 第三方库中(比如 SGI 的 STL): 映射:hash_map、hash_multimap(与 unordered_m...
The unordered container reserve function now actually reserves for N elements, as described in LWG 2156.Time handlingPreviously, some time values that were passed to the concurrency library would overflow, for example, condition_variable::wait_for(seconds::max()). Now fixed, the overflows changed...
Unordered Associative Containers : implement unordered data structures that can be quickly searched(13-16) 13 , unordered_set https://www.geeksforgeeks.org/unordered_set-in-cpp-stl/ 14 , unordered_multiset https://www.geeksforgeeks.org/unordered_multiset-and-its-uses/ ...
CD3D11_UNORDERED_ACCESS_VIEW_DESC class (Windows) CF_FILE_RANGE_BUFFER structure (Windows) RemoveDirectoryFromApp function (Windows) MDM_Policy_Config01_AppRuntime02 class (Windows) MDM_Policy_Config01_SystemServices02 class (Windows) DCompositionGetFrameStatistics function (Windows) InkDesktopHost.Cr...
CSOM dictionary:An object that contains an unordered collection of key/value pairs that can be used in anXMLrequest orJSONresponse text. Each key in a CSOM dictionary has a unique name. CSOM Double:A 64-bit, double-precision, floating-point value, which is the DOUBLE type described in [MS...
CC_HashTable An unordered key-value map. Supports best case amortized constant time insertion, removal, and lookup of values. CC_TreeTable An ordered key-value map. Supports logarithmic time insertion, removal and lookup of values. CC_HashSet An unordered set. The lookup, deletion, and inserti...
std::map<std::string, int, std::less<std::string>> sorted_words; std::unordered_map<std::string, int, std::hash<std::string>, std::equal_to<std::string>> words;The performance of those containers is often limited by the performance of the string keys, especially on reads. String...