Citi Bank interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Citi Bank
3 rounds | 3 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 2 months
Topics: Data Structures, Algorithm, DBMS, Networking,Operating Systems
Tip 1 : Practice questions on DS Algorithm ( array/string/DP/trees)
Tip 2 : Prepare SQL queries and normalization.
Application process
Where: Campus
Eligibility: Above 7
Tip 1 : Simple and clean
Tip 2 : Emphasize on internship
Interview rounds
01
Round
Medium
Online Coding Interview
Duration40 Minutes
Interview date1 Mar 2020
Coding problem1
1. Trapping Rain Water
Moderate
15m average time
80% success
0/80
Asked in companies
You have been given a long type array/list 'arr’ of size 'n’.
It represents an elevation map wherein 'arr[i]’ denotes the elevation of the 'ith' bar.
Print the total amount of rainwater that can be trapped in these elevations.
Note :
The width of each bar is the same and is equal to 1.
Example:
Input: ‘n’ = 6, ‘arr’ = [3, 0, 0, 2, 0, 4].
Output: 10
Explanation: Refer to the image for better comprehension:
Note :
You don't need to print anything. It has already been taken care of. Just implement the given function.
Problem approach
The idea is to traverse every array element and find the highest bars on the left and right sides. Take the smaller of two heights. The difference between the smaller height and height of the current element is the amount of water that can be stored in this array element.
To make this efficient one must pre-compute the highest bar on the left and right of every bar in linear time. Then use these pre-computed values to find the amount of water in every array element.
02
Round
Easy
Face to Face
Duration40 Minutes
Interview date10 Mar 2022
Coding problem2
Asked questions about stack queue LL and strings
1. Reverse Linked List
Easy
15m average time
85% success
0/40
Asked in companies
You are given a Singly Linked List of integers. You need to reverse the Linked List by changing the links between nodes.
Example:
Input:
2 4 5 -1
Output:
5 4 2 -1
Explanation: 2->4->5 is the initial linked list. If we reverse this, we get 5->4->2.
Problem approach
1) Divide the list in two parts - first node and
rest of the linked list.
2) Call reverse for the rest of the linked list.
3) Link rest to first.
4) Fix head pointer
2. Operating System Question
How does paging works?
03
Round
Easy
HR Round
Duration15 Minutes
Interview date11 Mar 2022
Coding problem0
It was an easy round with some basic HR Questions.
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
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