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| #include <iostream>
#include <stdlib.h>
#include <fstream>
#include "math.h"
#include <vector>
using namespace std;
int* ReadArrayFromFile(int* n, char* name)
{
int i, s;
ifstream File(name);
if (!File)
{
cout << "Cannot find a file\n";
exit(0);
}
File >> *n;
File >> s;
int *A = new int[*n];
for (i = 0; i < *n; i++)
{
File >> A[i];
}
File.close();
return A;
}
int* ReadSummsFromFile(int* s, char* name)
{
int i, n;
ifstream File(name);
if (!File)
{
cout << "Cannot find a file\n";
exit(0);
}
File >> n;
File >> *s;
int *A = new int[n];
for (i = 0; i < n; i++)
{
File >> A[i];
}
int *S = new int[*s];
for (i = 0; i < *s; i++)
{
File >> S[i];
}
File.close();
free(A);
return S;
}
using namespace std;
class Node
{
friend class HashTable;
Node* next;
int data;
public:
Node()
{
}
Node(int d, Node* n)
{
data = d;
next = n;
}
~Node()
{
}
};
class HashTable
{
public:
int size;
vector<Node*>* Nodes;
HashTable(int tableSize)
{
size = tableSize;
Nodes = new vector<Node*>(size);
}
~HashTable()
{
}
void insertByMultiplication(int data)
{
int index = getHashByMultiplication(data);
if (Nodes -> at(index) == NULL)
{
Nodes -> at(index) = new Node(data, NULL);
return;
}
Node* p = Nodes -> at(getHashByMultiplication(data));
while (p != NULL){
if (p -> next == NULL)
{
p -> next = new Node(data, NULL);
break;
}
p = p -> next;
}
}
void insertByDivision(int data)
{
int index = getHashByDivision(data);
if (Nodes -> at(index) == NULL)
{
Nodes -> at(index) = new Node(data, NULL);
return;
}
Node* p = Nodes -> at(getHashByDivision(data));;
while (p != NULL){
if (p -> next == NULL)
{
p -> next = new Node(data, NULL);
break;
}
p = p -> next;
}
}
void collisionCount(int hashCode, int *collisions)
{
int index = hashCode;
if (Nodes -> at(index) == NULL)
{
return;
}
Node* p = Nodes -> at(hashCode);
while (p != NULL)
{
if (p -> next != NULL)
{
(*collisions)++;
}
if (p -> next == NULL)
{
break;
}
p = p -> next;
}
}
int searchKeyByDivision(int data)
{
for (Node* pos = Nodes -> at(getHashByDivision(data)); pos; pos = pos -> next)
{
if (pos -> data == data)
return 1;
}
return 0;
}
int searchKeyByMultiplication(int data)
{
for (Node* pos = Nodes->at(getHashByMultiplication(data)); pos; pos = pos -> next)
{
if (pos->data == data)
return 1;
}
return 0;
}
int getHashSizeDiv()
{
return size;
}
int getHashSizeMulti()
{
return size;
}
int getHashByDivision(int key)
{
return abs(key % getHashSizeDiv());
}
int getHashByMultiplication(int key)
{
float A = 0.618033;
int hashCode = getHashSizeMulti() * fmod((key * A), 1);
return hashCode;
}
void print(int start)
{
int lineCount = 0;
for (int i = start; i < (Nodes -> size()); i++){
cout << i << "\t";
Node* p = Nodes -> at(i);
while (p != NULL){
cout << p -> data << " ";
p = p -> next;
}
cout << endl;
}
}
};
int main(int argc, char* argv[])
{
int n, s, i, j, k, y, counter, hashSizeDiv, origin, hashSizeMulti, collisionsQuantity = 0, choose = 2;
argv[1] = "input_10.txt";
int* A = ReadArrayFromFile(&n, argv[1]);
int* S = ReadSummsFromFile(&s, argv[1]);
origin = n;
hashSizeDiv = 3 * origin;
hashSizeMulti = 3 * origin;
switch (choose)
{
case 1:
{
HashTable* hash = new HashTable(hashSizeDiv);
for (i = 0; i < n; i++)
{
hash->insertByDivision(A[i]);
}
for (i = 0; i < hashSizeDiv; i++)
{
hash->collisionCount(i, &collisionsQuantity);
}
if (collisionsQuantity == 1)
collisionsQuantity--;
cout << collisionsQuantity;
for (i = 0; i < s; i++)
{
counter = 0;
for (j = 0; j < n; j++)
{
y = S[i] - A[j];
if (hash->searchKeyByDivision(y) == 1)
{
cout << endl << A[j] << " " << y;
counter++;
break;
}
}
if (counter == 0)
cout << endl << 0 << " " << 0;
}
cout << endl;
break;
}
case 2:
{
HashTable* hash = new HashTable(hashSizeMulti);
for (int i = 0; i < n; i++)
{
hash->insertByMultiplication(A[i]);
for (i = 0; i < hashSizeMulti; i++)
{
hash->collisionCount(i, &collisionsQuantity);
}
cout << collisionsQuantity / 5;
for (i = 0; i < s; i++)
{
counter = 0;
for (j = 0; j < n; j++)
{
y = S[i] - A[j];
if (y >= 0)
{
if (hash->searchKeyByMultiplication(y) == 1)
{
cout << endl << A[j] << " " << y;
counter++;
break;
}
}
}
if (counter == 0)
cout << endl << 0 << " " << 0;
}
cout << endl;
break;
}
}
}
system("pause");
return 0;
} |
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