1mg Interview Experience (Off Campus)

I was interviewed for Software Developer Profile at 1mg, gurugram.

Round 1: Online Test

  • Given an array of numbers, arrange them in a way that yields the largest value.
    For example, if the given numbers are {54, 546, 548, 60}, the arrangement 6054854654 gives the largest value. And if the given numbers are {1, 34, 3, 98, 9, 76, 45, 4}, then the arrangement 998764543431 gives the largest value.
  • We have to find the count of Longest increasing subsequence (LIS) for each change we made at ith position in array from 1 to n, i.e 1<=a[i]<=n.
    – Input:
    3 1               // n  i
    1 2 3
    – Output:
    2         //LIS of  1 1 3    put a[i]=1
    3        // LIS of  1 2 3     put a[i]=2
    2        //LIS of  1 3 3     put a[i]=3
    – Time Complexity Required: O(nlogn)+O(n)

Round 2:

  • Tell me about yourself.
  • Current project in the current organization
    – HTTP Methods of REST
    – Write a REST service to search a particular data in Database in current project.
  • Design an Authentication system (with only email ans password)(with flow and Database Schema).
  • Design a Third party Authentication system via Facebook(with flow and Database Schema).

Round 3:

  • Discussion on College Project based on Machine learning ( explain KNN- classifier )
  • Find the minimum element in a sorted and rotated array
    Input: {5, 6, 1, 2, 3, 4}
    Output: 1

  • To find maximum length substring in an input string which could be arranged into a palindrome, only even length palindromes are expected. Input is one line String which contains only integers.
    The output is the length of the substring which could be arranged in palindrome.
    Input: 124565463
    Output: 6 (substring 456546 can be rearranged to an even palindrome)
  • In 1D number line system (-Infinity, +Infinity), at beginning a car with velocity(V)=+1 at position(pos)=0 (origin), with every Acceleration(A) it jumps twice of its current velocity(in +ve or -ve direction) and with every Reverse(R) it’s position remain same but velocity changes to -1 if its was +ve or +1 if it was -ve.
    You have to find the count of shortest string (combination of A’s and R’s) to reach from origin to +N
    Input: +6
    Output: 5 (substring AAARA )
    Explanation:  pos      V
    Initial :           0        +1
    after A:         +1        +2
    after A:         +3       +4
    after A:         +7        +8
    after R:         +7         -1
    after A:         +6        -2
  • Implement rand3() using rand2()

  • Implement rand5() using rand2()

Round 4:

Round 5: VP round

  • Tell me about yourself.
  • Current project in the current organization
    – What was the toughest challenge you faced in a project?
  • Why do you want to leave current organisation
  • Print characters and their frequencies( special characters can be present).
    Input : str = “$characters$”
    Output : $2 c2 h1 a2 r2 t1 e1 s1
    Hint: Hash, AVL

Got Offer but declined as I had better option, not in terms of money but in tech. stack


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