{ cout << *it << " "; ++it; } cout << endl << endl;; } void test_unordered_map() { unordered_map<string, string> dict; dict.insert(make_pair("sort", "排序")); dict.insert(make_pair("string", "字符串")); dict.insert(make_pair("left", "左边")); unordered_map<string...
One question about time complexity of the insert function of std::unordered_map which on worst case is linear in size: https://en.cppreference.com/w/cpp/container/unordered_map/insert#Complexity I know that on average it's constant time but the question is when and why the time complexity...
operators (std::map) operators (std::multimap) operators (std::multiset) operators (std::queue) operators (std::set) operators (std::stack) operators (std::unordered_map) operators (std::unordered_multimap) operators (std::unordered_multiset) ...
map 键值对,一对一,会自动排序,底层数据结构是红黑树,查找、插入、删除某一元素贼快,因为其不是线性数据结构,故不能用sort函数。 #include<iostream> #include<map> #include<algorithm> #include<string> using namespace std; int main() { &nbs... ...
// std__unordered_map__unordered_map_begin.cpp // compile with: /EHsc #include <unordered_map> #include <iostream> typedef std::unordered_map<char, int> Mymap; int main() { Mymap c1; c1.insert(Mymap::value_type('a', 1)); c1.insert(Mymap::value_type('b', 2)); c1.inser...
Unordered map does not sort its element in any particular order with respect to either their key or mapped values, instead organizes into buckets depending on their hash values to allow for fast access to individual elements directly by their key values. Unordered map performs better than map whi...
Also, I would sort the rows alphabetically, so that we get: #include <iostream> #include <string> #include <unordered_map> #include <vector> Advice 2: One template per file I would extract away the main and put the entire disjoint set template into its own file; call it DisjointSet....
http://en.cppreference.com/w/cpp/container/unordered_map You will need a different container, a vector, or perhaps multimap<int,string> Jul 4, 2015 at 6:21am Duthomhas (13242) I think the mistake is in trying to apply a sort order on the unorderd_map container. Jul...
// std__unordered_map__unordered_map_begin.cpp // compile with: /EHsc #include <unordered_map> #include <iostream> typedef std::unordered_map<char, int> Mymap; int main() { Mymap c1; c1.insert(Mymap::value_type('a', 1)); c1.insert(Mymap::value_type('b', 2)); c1.inser...
// std__unordered_map__unordered_map_begin.cpp // compile with: /EHsc #include <unordered_map> #include <iostream> typedef std::unordered_map<char, int> Mymap; int main() { Mymap c1; c1.insert(Mymap::value_type('a', 1)); c1.insert(Mymap::value_type('b', 2)); c1.inser...