SafeSend SDE Intern Interview Questions and Answers

Three questions were assigned to be solved within a two-hour timeframe.

The assessment consists of two multiple-choice question (MCQ) rounds, each lasting 15 minutes, and one essay writing task requiring 400 words to be completed within 25 minutes.

OA + behavioural questions

Q1. Leetcode medium
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Q1. Leetcode medium
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Easy lc or medium lc quest

Q1. Coding round only was
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2 coding question level easy-medium leetcode

Q1. 2 coding question leetcode
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Q2. Dp graph trees stack queue
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Q1. 2 Coding question leetcode easy medium
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2 DSA questions and 70 minutes.

Q1. Implement Min-stack using O(N) space .
Ans. 
Min-stack is implemented using O(N) space by keeping track of minimum value at each element.
• Use two stacks - one to store the actual elements and another to store the minimum value at each step.

• When pushing an element, check if it is smaller than the current minimum and update the minimum stack accordingly.

• When popping an element, also pop from the minimum stack if the popped element is the current minimum.
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Q2. Sliding Window Problem.
Ans. 
Sliding Window Problem involves finding a subarray of fixed size k with the maximum sum.
• Use a sliding window approach to iterate through the array and keep track of the sum of elements within the window.

• Slide the window by removing the first element and adding the next element in each iteration.

• Keep track of the maximum sum found so far and update it if a new maximum is found.
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This round had questions from various topics like DBMS, system design, OOPs, aptitude etc. with one coding ques.

This had 2 coding questions (medium level) and a digital HR round where we just have to use a slider to answer our best reaction to situations.

Q1. Implementation of Min Stack
Ans. 
Implement a stack that supports push, pop, top, and retrieving the minimum element in constant time.
• Use two stacks - one to store the actual elements and another to store the minimum values.

• When pushing an element, check if it is smaller than the current minimum and push it to the min stack if so.

• When popping an element, check if it is the current minimum and pop from the min stack if so.

• Top operation can be implemente...read more
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Q2. Find leaf nodes in a binary tree ,followed by printing path to leaf nodes.
Ans. 
Find leaf nodes in a binary tree and print path to each leaf node.
• Traverse the binary tree using depth-first search (DFS)

• When reaching a leaf node, store the path from root to that leaf node

• Repeat the process for all leaf nodes in the tree
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Q1. DSA question to be solved
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1 hour long test, 1 easy and 1 medium leetcode problem + some apti questions.

Q1. Asked 1 codding question (Medium) * Next permutation of a number. Number was a time stamp (eg 11:55 PM)
Ans. 
Find the next permutation of a given timestamp in HH:MM AM/PM format.
• Convert the timestamp to a 24-hour format for easier manipulation.

• Identify the rightmost pair where the earlier digit is smaller than the later one.

• Swap this digit with the smallest larger digit to its right.

• Reverse the digits to the right of the swapped position to get the next permutation.

• Example: For '11:55 PM', the next permutation is '12:00 AM'.
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Q1. 3 medium leetcode questions from graphs, queue and dp.
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