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Python

Java

class SimpleHashMap:
    def __init__(self, size=100):
        self.size = size
        self.buckets = [[] for _ in range(size)]  # A list of buckets, each is a list (to handle collisions)

def hash_function(self, key):
        # Sum only the numerical values of the key, ignoring non-numeric characters
        numeric_sum = sum(int(char) for char in key if char.isdigit())
        return numeric_sum % 10  # Perform modulo 10 on the sum

def put(self, key, value):
        # Add or update a key-value pair
        index = self.hash_function(key)
        bucket = self.buckets[index]
        for i, (k, v) in enumerate(bucket):
            if k == key:
                bucket[i] = (key, value)  # Update existing key
                return
        bucket.append((key, value))  # Add new key-value pair if not found

def get(self, key):
        # Retrieve a value by key
        index = self.hash_function(key)
        bucket = self.buckets[index]
        for k, v in bucket:
            if k == key:
                return v
        return None  # Key not found

def remove(self, key):
        # Remove a key-value pair
        index = self.hash_function(key)
        bucket = self.buckets[index]
        for i, (k, v) in enumerate(bucket):
            if k == key:
                del bucket[i]  # Remove the key-value pair
                return

def print_map(self):
        # Print all key-value pairs in the hash map
        print("Hash Map Contents:")
        for index, bucket in enumerate(self.buckets):
            print(f"Bucket {index}: {bucket}")

# Creating the Hash Map from the simulation
hash_map = SimpleHashMap(size=10)

# Adding some entries
hash_map.put("123-4567", "Charlotte")
hash_map.put("123-4568", "Thomas")
hash_map.put("123-4569", "Jens")
hash_map.put("123-4570", "Peter")
hash_map.put("123-4571", "Lisa")
hash_map.put("123-4672", "Adele")
hash_map.put("123-4573", "Michaela")
hash_map.put("123-6574", "Bob")

hash_map.print_map()

print("\nName associated with '123-4570':", hash_map.get("123-4570"))

print("Updating the name for '123-4570' to 'James'")
hash_map.put("123-4570","James")

print("Name associated with '123-4570':", hash_map.get("123-4570"))

#Python

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BUCKET_COUNT 10
#define MAX_KEY_LEN 16
#define MAX_VAL_LEN 32

typedef struct Entry {
    char key[MAX_KEY_LEN];
    char value[MAX_VAL_LEN];
    struct Entry* next;
} Entry;

typedef struct {
    Entry* buckets[BUCKET_COUNT];
} SimpleHashMap;

unsigned int hashFunction(const char* key) {
    unsigned int sum = 0;
    for (int i = 0; key[i] != '\0'; i++) {
        if (key[i] >= '0' && key[i] <= '9') {
            sum += key[i] - '0';
        }
    }
    return sum % BUCKET_COUNT;
}

void initHashMap(SimpleHashMap* map) {
    for (int i = 0; i < BUCKET_COUNT; i++) {
        map->buckets[i] = NULL;
    }
}

void put(SimpleHashMap* map, const char* key, const char* value) {
    unsigned int index = hashFunction(key);
    Entry* current = map->buckets[index];
    
    // Update value if key already exists
    while (current != NULL) {
        if (strcmp(current->key, key) == 0) {
            strncpy(current->value, value, MAX_VAL_LEN - 1);
            current->value[MAX_VAL_LEN - 1] = '\0';
            return;
        }
        current = current->next;
    }
    
    // Add new key-value pair
    Entry* newEntry = (Entry*)malloc(sizeof(Entry));
    strncpy(newEntry->key, key, MAX_KEY_LEN - 1);
    newEntry->key[MAX_KEY_LEN - 1] = '\0';
    strncpy(newEntry->value, value, MAX_VAL_LEN - 1);
    newEntry->value[MAX_VAL_LEN - 1] = '\0';
    newEntry->next = map->buckets[index];
    map->buckets[index] = newEntry;
}

const char* get(SimpleHashMap* map, const char* key) {
    unsigned int index = hashFunction(key);
    Entry* current = map->buckets[index];
    
    while (current != NULL) {
        if (strcmp(current->key, key) == 0) {
            return current->value;
        }
        current = current->next;
    }
    
    return NULL; // Key not found
}

void removeEntry(SimpleHashMap* map, const char* key) {
    unsigned int index = hashFunction(key);
    Entry* current = map->buckets[index];
    Entry* prev = NULL;
    
    while (current != NULL) {
        if (strcmp(current->key, key) == 0) {
            if (prev != NULL) {
                prev->next = current->next;
            } else {
                map->buckets[index] = current->next;
            }
            free(current);
            return;
        }
        prev = current;
        current = current->next;
    }
}

void freeHashMap(SimpleHashMap* map) {
    for (int i = 0; i < BUCKET_COUNT; i++) {
        Entry* current = map->buckets[i];
        while (current != NULL) {
            Entry* temp = current;
            current = current->next;
            free(temp);
        }
    }
}

void printHashMap(SimpleHashMap* map) {
    printf("Hash Map Contents:\n");
    for (int i = 0; i < BUCKET_COUNT; i++) {
        Entry* current = map->buckets[i];
        printf("Bucket %d: ", i);
        while (current != NULL) {
            printf("(%s: %s) ", current->key, current->value);
            current = current->next;
        }
        printf("\n");
    }
}

int main() {
    SimpleHashMap map;
    initHashMap(&map);

put(&map, "123-4567", "Charlotte");
    put(&map, "123-4568", "Thomas");
    put(&map, "123-4569", "Jens");
    put(&map, "123-4570", "Peter");
    put(&map, "123-4571", "Lisa");
    put(&map, "123-4672", "Adele");
    put(&map, "123-4573", "Michaela");
    put(&map, "123-6574", "Bob");

printHashMap(&map);

// Demonstrate get and put
    printf("\nName associated with '123-4570': %s\n", get(&map, "123-4570"));
    printf("Updating the name for '123-4570' to 'James'.");
    put(&map, "123-4570", "James");
    printf("\nName associated with '123-4570': %s\n", get(&map, "123-4570"));

freeHashMap(&map);
    return 0;
}

// C

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        SimpleHashMap hashMap = new SimpleHashMap(10);

// Adding some entries
        hashMap.put("123-4567", "Charlotte");
        hashMap.put("123-4568", "Thomas");
        hashMap.put("123-4569", "Jens");
        hashMap.put("123-4570", "Peter");
        hashMap.put("123-4571", "Lisa");
        hashMap.put("123-4672", "Adele");
        hashMap.put("123-4573", "Michaela");
        hashMap.put("123-6574", "Bob");

hashMap.printMap();

// Demonstrating retrieval and update
        System.out.println("\nName associated with '123-4570': " + hashMap.get("123-4570"));
        System.out.println("Updating the name for '123-4570' to 'James'");
        hashMap.put("123-4570", "James");
        System.out.println("Name associated with '123-4570': " + hashMap.get("123-4570"));
    }
}

class SimpleHashMap {
    private final List<List<Pair>> buckets;

public SimpleHashMap(int size) {
        buckets = new ArrayList<>(size);
        for (int i = 0; i < size; i++) {
            buckets.add(new ArrayList<>());
        }
    }

private int hashFunction(String key) {
        int numericSum = key.chars()
                            .filter(Character::isDigit)
                            .map(Character::getNumericValue)
                            .sum();
        return numericSum % buckets.size();
    }

public void put(String key, String value) {
        int index = hashFunction(key);
        List<Pair> bucket = buckets.get(index);

for (Pair pair : bucket) {
            if (pair.key.equals(key)) {
                pair.value = value;
                return;
            }
        }

bucket.add(new Pair(key, value));
    }

public String get(String key) {
        int index = hashFunction(key);
        List<Pair> bucket = buckets.get(index);

for (Pair pair : bucket) {
            if (pair.key.equals(key)) {
                return pair.value;
            }
        }

return null; // Key not found
    }

public void remove(String key) {
        int index = hashFunction(key);
        List<Pair> bucket = buckets.get(index);
        bucket.removeIf(pair -> pair.key.equals(key));
    }

public void printMap() {
        System.out.println("Hash Map Contents:");
        for (int i = 0; i < buckets.size(); i++) {
            List<Pair> bucket = buckets.get(i);
            System.out.print("Bucket " + i + ": ");
            bucket.forEach(pair -> System.out.print("[" + pair.key + ": " + pair.value + "] "));
            System.out.println();
        }
    }
}

class Pair {
    String key;
    String value;

public Pair(String key, String value) {
        this.key = key;
        this.value = value;
    }
}

//Java