README.md

[FINISHED]DataStructure Codes for this Course

DataStructure Name	Test Type	Time	Notes
STL vector	pushing 128000000 (1GB) of int64 & clearing	5.0188 sec	It uses nearly (1GB) of system memory
Bidirectional stack linked based	pushing 128000000 (1GB) of int64 & clearing	8.1857 sec	the whole struct is 24 byte the real size > (3GB)
Bidirectional stack linked based	pushing 500000 of int64	nearly .4 sec
stack array based	pushing 500000 of int64	nearly .4 sec

Polish Notation Converter and Evaluator

Done docs is remained TODO

Queue Array based

I will mention a nice sinple trick was used as the base of this code which is circular implementation. We have two pointers front and end pointer. At appending:

end_pointer = (end_pointer +1) % MAX_QUEUE;

And at the dequeueing

front_pointer = (end_pointer +1) % MAX_QUEUE;

Example: if MAX_QUEUE = 10, end_pointer = 4 at the appending end_pointer = (4 +1) % 10 = 5.
But if end_pointer = 9, at the next append end_pointer = (1+9) %10 = 0. Which means we are circulating around the array with two pointers*. The same happens at the dequeueing process.

stack-linkedBased-bidirectional-nonhomogeneous

[This stack supports nonhomogeneous data defined in Types.h on one condition: (the data should be continous space in memory)] ex: int, float, double, char, arrays, structs, classed (classes should not use dynamic memory allocation ex: we can not use std::string, or std::vector) you can use any type in stack-linkedBased with the template definition

TODO

list-circular-doubly-linkedList

A circular doubly linked list but with Addition features:

• loop throw N/2 while getting the node by selecting the shortest path either from the start of the list or the end of the list;
• template implemented we can use list of any data type
• supports negative and positive indcies: -1 means the end of the list, and 0 means the start of the list

int x = l[-3];

• supports std::iterator which will reduce time greatly comparing the normal way. theoretically looping throw iterator is bi theta of (N), and looping throw indexing ie: l.get(i) or l[i] is big theta of (N²). But in practice normal way of looping take more more than N² due to memory.

#include <iostream>

#include "List.h"
// #define ITERATOR
#define NORMAL

int main() {

  List<long int> l;
  long int max = 100000;
  long int count =0;

  for (long int i=0; i<max; i++) {
    l.push_back(i);
  }
  std::cout << "size=" <<l.size() << std::endl;

#ifdef ITERATOR
  std::cout << "Loop throw iterator test\n";
  count =0;
  for(List<long int>::iterator itr = l.begin(); itr !=l.end(); ++itr) {
    *itr -=1;
    count ++;
  }
  std::cout << "iterator loop finished with count=" << count << std::endl;
#endif



#ifdef NORMAL
  std::cout << "Loop throw normal way test\n";
  count =0;
  for(long int i=0; i<max; i++) {
    l[i] -=1;
    count ++;
  }
  std::cout << "Normal loop finished with count=" << count << std::endl;
#endif


  return 0;
}