Hash Functions
Description
Hash functions are algorithms that map data of arbitrary size to fixed-size values (hash values or hash codes), typically for use in data structures such as hash tables or for data integrity verification. They are designed to efficiently compute a unique output (hash) for each unique input, and ideally, a small change in input should produce a significantly different hash value. Common applications include data indexing, password storage, and digital signatures.
C++ Code
#include <iostream>
#include <string>
#include <functional>
using namespace std;
size_t hashFunction(const string& input) {
hash<string> hasher;
return hasher(input);
}
int main() {
string data = "Hello, World!";
size_t hashValue = hashFunction(data);
cout << "Hash value of \"" << data << "\": " << hashValue << endl;
return 0;
}
Time and Space Complexity
| Operation | Time Complexity | Space Complexity |
|---|---|---|
| Hash Function | O(n) | O(1) |
Where:
- n: Length of the input data.