Wissen Interview Experience | Set 1 (On-Campus)

20 Sep, 2016
Wissen technology part of wissen Infotech came to our college for campus drive.Website- www.wissen.com
Round 1- written test -1.5 hrs6 coding questions1. Find intersection of 2 sorted arrays. Note: required O(n) and no use of data structure.
2. Stock – buy and sell to gain max profit. You have to buy and sell stocks onceInput- 1 2 20 5 6O/p – 19(20-1)
3. Print Reverse linkedlist without changing linkedlist. Note: required O(n)
4. Find whether number is cube root or not with out using math lib functions. Note: required O(n) (Hint binary search)
5. Replace 3 with 5 in an integer with out converting int to string conversionInput- 134Output – 154
6. Check whether 2 strings are anagram of each other.Eg – abc & backOutput – anagramNote- required O(n)(Hint : use map)
Round 2 – tech11. Data structure– detect Loop in linkedlist– check whether a binary tree is binary search tree or not
2. JAVAMultithreading and synchronization
3. OSprocess, threads, semaphore, mutex, deadlock and starvation
4. DBMSHow will you print all tuples of a table?What is foreign key and some questions on it.
Round 3- tech21.C++– write struct for generic linkedlist– dangling pointer and steps to removeEg-
struct node
{
   void *data;
   node *next;
}
main()
{
    node *p = new node;
    p->data = (int) new int;
    delete p;
}
remove dangling pointer caused by void* data.Ans – overload delete operator– destructor can be overload or notIf yes or no , why-Why constructor can be overloaded?
-Explain whole project which is mentioned in ur resumeWhich data structure did you used on ur project apart of arraySince I told him I didn’t used at specific data structure externally but internally MySQL use B+ and B tree for indexing internally– what is B+ and B tree (I didnt know abt B+)
2. DBMS-joins and write below queryStudent tableId l name l deptIdDepartment tabledeptId l HODname
Find the name of HOD who has more number of studentsHint- nested query / join
– Given matrix 2*2 , 2*3 and 3*3how will u store in single table in database
3. JavaCollection and synchronization
4. Data structure– create special stack in which you can find min element in O(1)– Do you have any question?
Some Questions which was asked to others-quicksort-arraylist vs linkedlist-heap memory vs stack memory-if u have given names of people and their respective countries and I need to access all names of a particular country by O(1)Ans- map>
Round 4 – HRTypical HR questions
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