>usingunordered_set=std::unordered_set<Key, Hash, Pred, std::pmr::polymorphic_allocator<Key>>; } (2)(since C++17) std::unordered_setis an associative container that contains a set of unique objects of typeKey.
find out whether there are two distinct indices i and j in the array such that nums[i] = nu...
<cpp |container |unordered set std::pair<iterator,bool>insert(constvalue_type&value); (1)(since C++11) std::pair<iterator,bool>insert(value_type&&value); (2)(since C++11) iterator insert(const_iterator hint,constvalue_type&value); ...
#include <iostream> #include <unordered_set> int main() { std::unordered_set<int> example{1, 2, 3, 4}; for (int x : {2, 5}) if (example.contains(x)) std::cout << x << ": Found\n"; else std::cout << x << ": Not found\n"; } Output: 2: Found 5: Not found...
<< "Found " << *search << '\n'; else std::cout << "Not found\n"; std::unordered_set<std::string, string_hash, std::equal_to<>> set{"one"s, "two"s}; logger::enabled = true; std::cout << "Heterogeneous lookup for unordered containers (transparent hashing):\n" << (set...
unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors span(C++20)−mdspan(C++23) Iterators library Ranges library(C++20) Range factories−Range adaptors generator(C++23) Algorithms library ...
unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors span(C++20)−mdspan(C++23) Iterators library Ranges library(C++20) Range factories−Range adaptors generator(C++23) Algorithms library ...
>unordered_map 可以学习哈希表相关知识 >array 可以当作部分 pair 和 tuple 的替用品,或者替代原生数组 # 一些其他容器 >bitset >basic_string 另外,可以参阅C 的字符串函数 # IO >cpp 风格 IO 可以了解 stringstream 类,以及 输入/输出操纵符 >C 风格 IO ...
unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors span(C++20)−mdspan(C++23) Iterators library Ranges library(C++20) Range factories−Range adaptors generator(C++23) Algorithms library ...
unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors span(C++20)−mdspan(C++23) Iterators library Ranges library(C++20) Range factories−Range adaptors generator(C++23) Algorithms library ...