void deleteDups(LinkListNode n) {
Hashtable table;
LinkListNode prev;
while (n) {
if (table.containsKey(n.data)) {
prev.next = n.next;
}
else {
table.insert(n.data, true);
prev = n;
}
n = n.next;
}
}
int main()
{
//freopen("abbaditest.txt","r",stdin); // if you use this line, it merely redirects stdin to input.txt file; simple as that
try
{
Hashtable h;
while(true)
{
string str;
cin >> str;
if(cin.eof())
{
break;
}
if(str.compare("exit") == 0)
{
break;
}
else if(str.compare("linearprobing") == 0)
{
h.setMode(1);
}
else if(str.compare("doublehashing") == 0)
{
h.setMode(2);
}
else if(str.compare("insert") == 0)
{
int key;
string name;
double gpa;
cin >> key >> name >> gpa;
Student* tmp = new Student(name, gpa);
h.insert(key, tmp);
}
else if(str.compare("lookup") == 0)
{
int key;
cin >> key;
h.lookup(key);
}
int main()
{
const unsigned int START_SIZE = 32768;
unsigned int largest_size = START_SIZE * pow(2,10);
unsigned int elems_tested = START_SIZE * 16;
//unsigned int current_size = START_SIZE;
//unsigned int old_size = 0;
// int max_size = START_SIZE^(INCREMENT_FACTOR*number_of_trials);
// for our outputting of the results
ofstream ofs("results.txt");
// this is going to hold the measurements
vector<recorder<timer> > stats(number_of_algorithms);
// The "U" is the type for the queues x and y (poorly named, i know). Using the largest sequence multiplied by factor to allocate memory
//EMAQueue<U> x(current_size);
cout << "________";
for (int i = 0; i < number_of_algorithms; ++i)
cout << headings[i];
cout << endl;
cout << " Range ";
for (int i = 0; i < number_of_algorithms; ++i)
cout << "| Time ";
cout << endl;
//initialize vector of ints
vector<int> testVector;
//initialize vector of keys
vector<int> keyVector;
//initialize random stuff
std::random_device rd; // obtain a random number from hardware
std::mt19937 eng(rd()); // seed the generator
std::uniform_int_distribution<> distr(START_SIZE, largest_size); // define the range
for (unsigned int i = 0; i < elems_tested; ++i) {
testVector.push_back(distr(eng));
keyVector.push_back(testVector[i]%101);
}
for (int count = 0; count < number_of_trials; count ++)
{
//displays the number of elements that will be added to the data structures
cout << setw(8) << 1+ largest_size - START_SIZE << flush;
ofs << setw(8) << 1+ largest_size - START_SIZE;
//resets stats
for (int i = 0; i < number_of_algorithms; ++i)
stats[i].reset();
//start of testing
for (int j = 0; j < number_of_trials; ++j)
{
//initialize data structures each trial
Hashtable<unsigned int> emHash;
unordered_map<unsigned int, unsigned int> stlMap;
HashMap sepChain;
hashdict<unsigned int, unsigned int> bookHash(elems_tested, -1);
//does test for each algorithm
for (int i = 0; i < number_of_algorithms; ++i)
{
//resets timer
timer1.restart();
//completes the test "current_size" times
for (unsigned int k = 0; k < elems_tested; ++k)
{
//data type operations to be tested
switch (i)
{
//insert values to Emily's Hash
case 0: emHash.insert(testVector[k]);
//emHash.insert(k);
break;
case 1: stlMap.insert(make_pair(keyVector[k], testVector[k]));
//stlMap.insert(k, k);
break;
/*
case 2: //sepChain.insert(testVector[k]);
//sepChain.insert(k);
break;
case 3: //bookHash.insert(keyVector[k], testVector[k]);
//bookHash.insert(k, k);
break;
*/
case 2: emHash.remove(testVector[k]);
//emHash.remove(k);
break;
case 3: stlMap.erase(testVector[k]);
//stlMap.erase(k);
/* break;
case 6: //sepChain.remove(testVector[k]);
//sepChain.remove(k);
break;
case 7: bookHash.removeAny();
*/
}
}
//stops timer
timer1.stop();
//records stats
stats[i].record(timer1);
}
//cout << "insert: " << START_SIZE << "to: " << largest_size << endl;
} // end of trials loop
for (int i = 0; i < number_of_algorithms; ++i)
{
//outputs results console
stats[i].report(cout);
//outputs results to file
stats[i].report(ofs);
}
cout << endl;
ofs << endl;
//delete vector
testVector.clear();
keyVector.clear();
largest_size = largest_size/2;
//repopulate with smaller distribution
std::uniform_int_distribution<> distr(START_SIZE, largest_size); // define the range
for (unsigned int m = 0; m < elems_tested; ++m) {
testVector.push_back(distr(eng));
keyVector.push_back(testVector[m]%101);
}
}
return 0;
}
