int array[10];

0   0
1   0
2   0
3   0
...
51  10
52  22
...
60  5
61  9
...
83  0
84  0

int possibilities[84];
possibilities[51] = 10;

#include <iostream>
using namespace std;
 
class array{
	int* __date;
	unsigned long long __size;
	void resize(unsigned long long _size){
		int* tmp = new int[_size];
		copy(__date,__date+size(),tmp);
		delete[] __date;
		__date = tmp;
		__size = _size;
	}
public:
	array(){
		__date = NULL;
		__size = 0;
	}
	~array(){
		delete[] __date;
	}
	unsigned long long size(){
		return __size;
	}
	int& operator[](unsigned long long index){
		if (index+1 > size()){
			resize(index+1);
		}
		return __date[index];
	}
};
 
int main(int argc, char **argv) {
	array sexy;
	for(int i = 0; i < 10; ++i)
		sexy[i] = i;
	for(size_t i = 0; i < sexy.size(); ++i)
		cout << sexy[i] << ' ';
	return 0;
}

map<int, int> array;
 
array[20] = 5;
array[51] = 6;
 
cout << array[10] << "," << array[20] << "," << array[51] << endl;