Recent questions and answers in DS - GATE CSE Doubts

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Made aesy test series : BFS
Consider the following graph: The minimum size of queue required when performing BFS on above graph is ________. (Take size of queue as by maximum number of elements at any time). What will be the correct answer for the foolowing question?

asked Feb 5 in DS by vishal burnwal (135 points) | 27 views

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Testbook: Mock
In a BST, the key with value 5 was searched after traversing nodes with values 1,3,4,6,7,8,9, not necessarily in that order. What is the probability that the 3rd element on the search path beginning from the root is either 3 or 8?

asked Jan 29 in DS by Sambhrant Maurya (396 points) | 73 views

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applied gate mock 5
[closed]

asked Jan 27 in DS by abhinav649 (67 points) | 34 views

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1 answer

madeeasy test series answer doubt
https://csedoubts.gateoverflow.in/8774/made-easy-test-series-2020-min-heap what is the correct answer? 6 or 7

answered Jan 25 in DS by shashin (1.9k points) | 30 views

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ISRO-2020 Exam
The Postorder traversal of a binary tree is ACEDBHIGF. the preorder Traversal is? ABCDEFGHI FBADCEGIH FABCDEGHI ABDCEFGIH

asked Jan 25 in DS by aditya dhanraj (7 points) | 11 views

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Madeeasy test series - Retrieve address of element in matrix

asked Jan 21 in DS by luc_Bloodstone (36 points) | 20 views

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Madeeasy test series - recurrence relation

asked Jan 21 in DS by luc_Bloodstone (36 points) | 7 views

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Made Easy test series data structure binary search tree

asked Jan 21 in DS by Ram Swaroop (173 points) | 25 views

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Enqueue and Dequeue

asked Jan 20 in DS by Akash Papnai (17 points) | 6 views

+1 vote

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Gatebook Heaps
What is the minimum number of comparisons required in the worst case to find the smallest element in a min-heap? Can someone please explain the procedure. The answer is 50*51 / 2

asked Jan 20 in DS by neeraj_bhatt (268 points) | 9 views

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Applied course test series- DS
Which of the following statements is/are true? Converting an adjacency matrix representation to an adjacency list representation takes O(V+E) time. In any connected undirected graph with exactly 5 simple cycles (that do not share any edges), there are at most 10 ... between every pair of vertices Options: Only I Only II Both I and II Neither I nor II PS.: Answer is d.

asked Jan 18 in DS by Shubhranshu Maurya (8 points) | 18 views

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Test series gateflix
No. of possible BST with n elements numbered 1,2,…,n with exactly two leaf nodes ?

asked Jan 12 in DS by Dipanshu Rana (34 points) | 11 views

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Applied course test series : Queue
Consider a circular queue q' is implemented whose size is given 15 and the locations of the elements of the queue are q[0],q[1],q[2], .,q[14]. In this given circular queue currently rear is pointing at q[7] after inserting 11th element, then find the position of front ... ,...). A) q[2] B) q[3] C) q[11] D) q[12] What will be the correct answer for above question?

asked Jan 7 in DS by vishal burnwal (135 points) | 15 views

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MadeEasy FULL SYLLABUS TEST-5 (ADVANCE LEVEL) GATE 2020 - Q35 BST

asked Jan 5 in DS by DukeThunders (415 points) | 19 views

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Cormen 3e BST Exercise-12.2-8 page no-294
Prove that no matter what node we start at in a height-h binary search tree, k successive calls to TREE-SUCCESSOR take O(k + h) time

asked Jan 3 in DS by aditi19 (55 points) | 14 views

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Made easy Q48 Full length 2019
Please Explain

asked Jan 1 in DS by ssap09 (42 points) | 26 views

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1 answer

ACE Subject wise test
, A tree is an undirected graph G that satisfies Q)G is connected and the 3-vertex complete graph K3 is not a minor of G. T/F (what is minor of G)??

answered Dec 29, 2019 in DS by Pratyush Priyam Kuan (803 points) | 31 views

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1 answer

MadeEasy FULL SYLLABUS TEST-1 (BASIC LEVEL) GATE 2020 Q58

answered Dec 29, 2019 in DS by neeraj_bhatt (268 points) | 27 views

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1 answer

ACE FULL LENGTH MOCK TEST-1
What is the converse pre-order of the following binary tree if the given in-order and post-order as follows In-order:ACDEBGHF Post-order:ADECHFGB a)BCAEDGFH b)BCAEDGHF c)BCADEGFH d)BGFHCEDA

answered Dec 24, 2019 in DS by Pratyush Priyam Kuan (803 points) | 32 views

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ACE- DS Test Series
Consider a BST T with all distinct keys. If the right subtree of a node X in the tree T is empty and X has inorder successor, the minimum number of ancestor of node X is_______________(Every node is considered to be it’s own ancestor also) Given ans 2 and my ans 1. Which one correct?

asked Dec 22, 2019 in DS by srestha (679 points) | 13 views

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MadeEasy Multi Subject DS+Algo 2020 Test Q33 Max Heap

asked Dec 21, 2019 in DS by DukeThunders (415 points) | 30 views

+1 vote

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#data structute
Q.how many stack are required to calculate prefix and postfix expression?

asked Dec 17, 2019 in DS by amit166 (139 points) | 7 views

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2 answers

Self Doubt-Arrays
$3-d\ array:$ $A[5….11,3…7,6….16]$ Using column major order and row major order find: $location\left ( A[9][5][14] \right )=?$ take BA: 1000 and int size: 10 bytes

answered Dec 13, 2019 in DS by Mk Utkarsh (505 points) | 80 views

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Applied course test series : Topological sorting
Which of the following is not the topological sorting of the below graph. A) 1,2,3,4,5,6,7,8,9,10,11 B) 1,3,2,5,4,6,7,8,9,10,11 C) 1,3,2,4,5,6,8,7,10,9,11 D) 1,3,2,4,5,6,8,7,9,10,11 My doubt is that according to me all the four orders given are correct ,but they provided (D) as the answer. Are they right?

asked Dec 12, 2019 in DS by vishal burnwal (135 points) | 23 views

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ME - test series
Consider 3 dimensional array $A[90][30][40]$ stored in linear array in column major order, if the base address starts at $10$, what is the location of $A[20][20][30]$? Assume the first element is stored at $A[1][1][1]$. Solution given is: But I think that is row major order. Isn’t it?

answered Dec 11, 2019 in DS by arya_stark (64 points) | 76 views

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GATEBOOK DSA
You are given a hash table with n keys and m slots, with the simple uniform hashing (assume each key is equally likely to be hashed into each slot). Collisions are resolved by chaining. What is the expected number of slots that end up not being empty ?

answered Dec 10, 2019 in DS by goxul (375 points) | 39 views

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1 answer

GATE GURU:DSA 596
What is the worst case time complexity to delete random element in a binary heap 1. O(nlogn) 2. O(logn) 3. O(n2) 4. O(n)

answered Dec 7, 2019 in DS by Pratyush Priyam Kuan (803 points) | 18 views

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Made easy test series : Binary Search Tree
A binary search tree with n nodes is constructed. Along with the key each node stores the no. of elements in the sub tree rooted at that node . We have given two elements a and b ,such that a<b . What will be the no. of comparisons and addition ... n) C.) O(log n) and O(loglog n) D.) O(n) and O(n) Plz explain above question and give solution.

asked Dec 5, 2019 in DS by vishal burnwal (135 points) | 14 views

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#DataStructure#METest_Series
Why b option is wrong? For root it should be valid. Plz explain

asked Dec 3, 2019 in DS by nandani17 (33 points) | 11 views

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1 answer

Made Easy Test Series:DS
The number of min heaps possible with 15 distinct elements such that every leaf node is greater than all the non-leaf nodes are ______ [closed]

answered Nov 27, 2019 in DS by srestha (679 points) | 43 views

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Made Easy Test Series DS
The number of BSTs possible with 6 nodes numbered 1,2,3,4,5,6 with exactly one leaf node are _______

asked Nov 27, 2019 in DS by Sambhrant Maurya (396 points) | 39 views

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GATE GURU: P & DS
The height h of an AVL tree with n nodes lies in the interval: 1. log10 (n) ≤ h < c log10 (n+1)+b 2. log2 (n) ≤ h < c log2 (n+1)+b 3. log10 (n+1) ≤ h < c log10 (n+2)+b 4. log2 (n+1) ≤ h < c log2 (n+2)+b Not able to understand the question, can anyone answer?

asked Nov 21, 2019 in DS by Debapaul (698 points) | 11 views

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1 answer

GATE GURU :DSA 2020 TOPIC TEST
Which of the following does not define a tree ? 1. A tree is an acyclic graph with n-1 edges where n' is the number of vertices in the graph. 2. A tree is a connected acyclic graph. 3. A tree is an acyclic connected graph with n-1 edges where n' is ... 't all the options right? Ans given is D, but how can D be the ans, as a graph with no cycles must be a tree right?

answered Nov 21, 2019 in DS by Satbir (4.1k points) | 12 views

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GATE GURU TEST : DSA
consider the following infix expression (P+Q*R^S)/(P+Q^S) What is the minimum size of stack required to convert this infix expression to postfix expression?

asked Nov 19, 2019 in DS by Debapaul (698 points) | 36 views

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madeeasy test
Number of min heap tree possible with 15 distinct element such that every leaf node must be greater than all non-leaf nodes of the tree are_______________. ans given as 8! * 4! * 2! *1( as it's assuming that always leaf nodes are maximum than any other ... other non-leaf node). suppose, 2648957(consider elements in an array) see 5 & 6 How can we count this type of combinatons.

asked Nov 17, 2019 in DS by MRINMOY_HALDER (37 points) | 22 views

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Made Easy Test Series 2020 Min heap
Consider the following array elements <40,35,20,10,15,16,17,8,4,30> The minimum number of interchanges needed to convert into a min heap using build heap method is ? I am getting 7 as the answer but it is given 6 as the answer kindly help me understand where i am going wrong.

asked Nov 7, 2019 in DS by Piyush #### (9 points) | 38 views

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ace test series GATE 2020 trees
can someone please explain the below question

asked Oct 28, 2019 in DS by Pratyush Priyam Kuan (803 points) | 10 views

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self ___doubts
What is the meaning of ROOTED binary tree 1)2nCn / (n+1) , for the number unlabeled trees 2)2nCn / (n+1) ) * (n!) , for labeled trees 3)No of Labelled Trees => n pow n-2 4)Total No of rooted labeled trees => (n pow n-2) * n => n pow n-1 please diff b/w all 4

asked Oct 11, 2019 in DS by mohan123 (20 points) | 15 views

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gatebook_graph
The edge graph of a graph G is the graph with vertex set E(G) in which two vertices are joined if and only if they are adjacent edges in G. if G is a simple graph with degree sequence , the no of edges in edge graph of G is?

asked Oct 10, 2019 in DS by mohan123 (20 points) | 7 views

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1 answer

Self doubt:GATE 2004 Data Structures
In below question, it can be done via both front and rear node as well, isn't it? A circularly linked list is used to represent a Queue. A single variable p is used to access the Queue. To which node should p point such that both ... the nptel video below shows for front node. Please let me know if I'm missing something. https://youtu.be/PGWZUgzDMYI?t=31m32s

answered Oct 10, 2019 in DS by Abhinav993 (85 points) | 24 views

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