DSA in java

Feb 13, 2023Download as PPTX, PDF2 likes507 views

This document discusses various Java data structures and when to use them. It covers common data structures like ArrayList, LinkedList, HashSet, TreeSet, LinkedHashSet, PriorityQueue, HashMap, TreeMap, LinkedHashMap, Stack, and Queue. For each data structure, it provides an example of how to initialize it and the scenarios when it would be appropriate to use that particular data structure, such as when ordering or frequency of elements is important.

DSA
Datastructure and algorithms for coding interviews
By
Saran Kumar R

Apply appropriate datastructure for efficiency
• ArrayList
• LinkedList
• HashSet
• TreeSet
• LinkedHashSet
• PriorityQueue(heap)
• HashMap
• TreeMap
• LinkedHashMap
• Stack
• Queue

ArrayList
ArrayList<Integer> a=new ArrayList<>();
when to use?
• unknown size.
• Accessing and retrieving elements

LinkedList
LinkedList<Integer> a=new LinkedList<>();
When to use?
• modifications in an list
• unknown size

Hash Set
HashSet<Integer> a=new HashSet<>();
When to use?
• To check if an element exist or not.
• To eliminate duplicates.

Tree Set
TreeSet<Integer> a=new TreeSet<>();
When to use?
• you want elements to be sorted.

LinkedHashSet
LinkedHashSet<String> a=new LinkedHashSet<>();
When to use?
• you want to access elements in the inserted order.

PriorityQueue(heap)
PriorityQueue<Integer> a=new PriorityQueue<>();
When to use?
• To find kth largest,smallest or most frequent,less frequent elements faster.
• Quick sort -> O(nlogn) heap-> O(n)

Hash Map
HashMap<String,Integer> a=new HashMap<>();
When to use?
• To store in key:value pairs.
• Store frequency of elements.

TreeMap
TreeMap<Integer,String> a=new TreeMap<>();
When to use?
• When you want keyset to be sorted.
a.put(3,”sk”); output: {1=D3, 2=yj, 3=sk, 7=yk}
a.put(2,”yj”);
a.put(7,”yk”);
a.put(1,”D3);

LinkedHashMap
LinkedHashMap<Integer,String> a=new LinkedHashMap<>();
When to use?
When you want keyset to be in inserted order.
a.put(3,”sk”); output: {3=sk, 2=yj, 7=yk, 1=D3}
a.put(2,”yj”);
a.put(7,”yk”);
a.put(1,”D3);

Stack
Stack<Integer> a=new Stack<>();
When to use?
• DFS
• Backtracking

Queue
Queue<Integer> a=new Queue<>();
When to use?
• BFS
• Level order traversal in tree

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DSA in java

1. DSA Datastructure and algorithms for coding interviews By Saran Kumar R

2. Apply appropriate datastructure for efficiency • ArrayList • LinkedList • HashSet • TreeSet • LinkedHashSet • PriorityQueue(heap) • HashMap • TreeMap • LinkedHashMap • Stack • Queue

3. ArrayList ArrayList<Integer> a=new ArrayList<>(); when to use? • unknown size. • Accessing and retrieving elements

4. LinkedList LinkedList<Integer> a=new LinkedList<>(); When to use? • modifications in an list • unknown size

5. Hash Set HashSet<Integer> a=new HashSet<>(); When to use? • To check if an element exist or not. • To eliminate duplicates.

6. Tree Set TreeSet<Integer> a=new TreeSet<>(); When to use? • you want elements to be sorted.

7. LinkedHashSet LinkedHashSet<String> a=new LinkedHashSet<>(); When to use? • you want to access elements in the inserted order.

8. PriorityQueue(heap) PriorityQueue<Integer> a=new PriorityQueue<>(); When to use? • To find kth largest,smallest or most frequent,less frequent elements faster. • Quick sort -> O(nlogn) heap-> O(n)

9. Hash Map HashMap<String,Integer> a=new HashMap<>(); When to use? • To store in key:value pairs. • Store frequency of elements.

10. TreeMap TreeMap<Integer,String> a=new TreeMap<>(); When to use? • When you want keyset to be sorted. a.put(3,”sk”); output: {1=D3, 2=yj, 3=sk, 7=yk} a.put(2,”yj”); a.put(7,”yk”); a.put(1,”D3);

11. LinkedHashMap LinkedHashMap<Integer,String> a=new LinkedHashMap<>(); When to use? When you want keyset to be in inserted order. a.put(3,”sk”); output: {3=sk, 2=yj, 7=yk, 1=D3} a.put(2,”yj”); a.put(7,”yk”); a.put(1,”D3);

12. Stack Stack<Integer> a=new Stack<>(); When to use? • DFS • Backtracking

13. Queue Queue<Integer> a=new Queue<>(); When to use? • BFS • Level order traversal in tree

DSA in java

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