i want to find top 10 elements int the hash table. The hash table contains 250000 elements and these elements are only integer values. I dont want to sort the whole table. When i find the top 10 elements it is enough for me the rest is not important. What is the FASTEST(RUNTÄ°ME) way to ..

#### Category : hashtable

key is the key (an int), and pairs are the pair array let index = (key * magic_number) >> (hash_table_capacity_log2); while(true) { if(pairs[index].key == key) return index; ++index; index = index & (table_capacity – 1); # table capacity is power of 2 } This is a linear probing method which returns the index where the ..

The documentation mentions that std::unordered_map uses a hash table. How does it achieve O(1) lookup of a specific key in the hash table? The only way I can think of is to store each key at an address computed from the hash value of the data it holds. If this is the case, how does ..

In a code in C++, for each input from the user, I am generating at most 20,000,000 unsigned long numbers one by one and checking if they are compatible with the inputs or not. Generated numbers are totally different according to the different inputs, however, I know that at most 10% of them are unique ..

for my project I need a hash table which uses string keys and integer array values. I could not find a way to write anything and provide here as an example. I have tried taking a look at codes around the internet however neither did I understand how to write mine nor find an example ..

Here’s a hash map which I tried to make faster for something: https://github.com/martinus/robin-hood-hashing/blob/master/src/include/robin_hood.h I tried to make it faster by making it so it could use std::unique_ptr<wchar_t[]> keys and look up keys by raw pointers, and I did this by including cwchar on line 51, and adding the code from lines 770-809, lines 1726-1778, and ..

I am having trouble defining and creating said array, however. template <typename DataType, typename KeyType> class HashTable {} contains private member Table <DataType, KeyType> *dataTable; I was told that I need to change the storage data type to be an array. Where exactly do I implement this change. Thanks for any help. Source: Windows Questions ..

I was reading about C++ unordered_map and have few questions which I can’t answer clearly. I have noticed that unordered_map puts one element per index and not multiple (hash tables can be implemented using on of these methods to solve 2 elements being mapped to same index) If an element with key A in the ..

I have an implementation of Hash Table with chaining: #include <functional> template <class KeyType, class ValueType> struct Node { KeyType key_; ValueType value_; Node* next_; Node(KeyType, ValueType); }; template <class KeyType, class ValueType, class Func = std::hash<KeyType>> class HashTable { public: HashTable(); explicit HashTable(Func); HashTable(size_t, double, Func = std::hash<KeyType>()); ~HashTable(); void insert(KeyType, ValueType); ValueType* find(KeyType); ..

I’m trying to figure out if this block of code would have any memory leakage. There are two classes. Class table is declared in htable.h as such template<typename X, typename Y> class Table{ public: X key; Y value; bool empty; Table<X,Y>(){ empty = true; } Table<X,Y>(const X& input, const Y& input2){ key = input; value ..

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