Fundamental-Algorithms -Assignment No. 2: Analysis & Comparison of Bottom­up and Top­down - Solved

 Build Heap Approaches 

 Implementation
 

You are required to implement ​correctly and efficiently​ two methods for building a heap, namely the ​bottom­up and the ​top­down strategies. Additionally, you have to implement heapsort.

 

You may find any necessary information and pseudo­code in your course notes, or in the book[1]: 

●      Bottom­up​: section 6.3 (Building a heap) 

●      Heapsort​: chapter 6.4 (The heapsort algorithm) 

●      Top­down​: section 6.5 (Priority queues) and problem 6­1 (Building a heap using insertion) 

 

Tresholds
 

Treshold 
Requirements 
5 
Implement and exemplify correctness of bottom­up build heap procedure
6 
Implement and exemplify correctness of heapsort
7 
Implement and exemplify correctness of top­down build heap procedure
9 
Comparative analysis of the two build heap methods, in the average case
10 
Interpretations, advantages/disadvantages of each approach
  

 

1.      You are required to compare the two build heap procedures in the average case.​ Remember that for the ​average case you have to repeat the measurements m times (m=5) and report their average; also for the ​average case, make sure you always use the ​same input sequence for the two methods – to make the comparison fair.

 

2.      This is how the analysis should be performed:

­ vary the dimension of the input array (​n​) between [100…10000], with an increment of maximum 500 (we suggest 100).

­ for each dimension, generate the appropriate input sequence for the method; run the method, counting the operations (assignments and comparisons, may be counted together for this assignment).

! Only the assignments and comparisons performed on the input structure and its corresponding auxiliary variables matter.

  

3.      Generate a chart which compares the two methods under the total number of operations, in the ​average case. If one of the curves cannot be visualized correctly because the other has a larger growth rate, place that curve on a separate chart as well. Name your chart and the curves on it appropriately.

 

4.      Interpret the chart and write your observations in the header (block comments) section at the beginning of your main .cpp file.

 

5.      Only the correctness of heapsort is demonstrated, the analysis is not necessary.

 

6.      (​extra – for extra credit​) Try to compare the two build heap procedures in the worst​ case. What do you observe?