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#include <list>
#include <iostream>
using namespace std;

const int SIZE = 10;

class Node{
public:
	Node(){}
	Node(int k, int v):key(k), value(v){}
	int key, value;
};

class HashMap {
private:
	list<Node*> data[SIZE];

public:
	~HashMap();
	Node* get(int key);
	void put(int key, int value);

int hashFn(int val){ return val % 13; }
};

HashMap::~HashMap(){
	for(int i = 0; i < SIZE; ++i){
		list<Node*>& val = data[i];
		for(list<Node*>::iterator it = val.begin(); it != val.end(); it++){
			Node* n = *it;
			delete n;
		}
	}
}

Node* HashMap::get(int key){
	int hashValue = hashFn(key);
	int bucket = hashValue % SIZE;
	list<Node*>::iterator it = data[bucket].begin();

while(it != data[bucket].end()){
		
		Node ** d = &(*it);	
		if((*d)->key == key){
			return *d;
		}
		
		it++;
	}
	return NULL;
}

void HashMap::put(int key, int value){
	int hashValue = hashFn(key);
	int bucket = hashValue % SIZE;
	Node* node = this->get(key);
	if(node == NULL){
		data[bucket].push_front(new Node(key, value));
	}
	else{
		node->value = value;
	}
}

int main(){
	HashMap map;
	cout << "Finding 5: " << map.get(5) << endl;  // -1
	map.put(5, 10);
	map.put(5, 11);
	cout << "Finding 5: " << map.get(5)->value;  // 11
	return 1;
}

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Compilation time: 0.47 sec, absolute running time: 0.16 sec, cpu time: 0 sec, memory peak: 2 Mb, absolute service time: 0.87 sec