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I interviewed at Virtu Financial for their 2027 SWE summer role and made it to the second, technical round. The first round was just an HR screen where recruiter asked me a bunch of questions about my resume none super technical in depth. I…
I interviewed for the Systems Development Role and got asked 3 Questions (2 DSA and 1 Behavioural) Q1. Given a list if meeting start and end time , find out the number of rooms required to hold all the meetings This question exactly - [http…
Interviewed at Citadel for SWE intern, July 2026, first technical round (CoderPad + Zoom). Format: ~20 minutes resume grilling/systems knowledge, then a ~20-minute hard problem with an AI assistant allowed. The problem just a reworded versi…
Problem statement You have 2^n players in a fixed single elimination tournament, labeled 0 to 2^n - 1. Round 1 is 0 vs 1, 2 vs 3, and so on. In later rounds, winners from neighboring bracket blocks play each other. Given p[i][j], the probab…
Result: got offer The loop had a few coding / ds rounds and one refactor / OOP-style round. Round 1: The interviewer asked me to design a data structure that supports: add(data, time) time is always given in increasing order. delete(time) D…
given a m x n matrix with values in one operation: 1. you can select one row 2. remove either first element or last element from the row if you remove first element, then second element becomes the first we can perform these operations exac…
Optiver runs a system that keeps track of all currently active orders for a given financial instrument. The orders must be maintained in sorted order by price. As new orders arrive and existing orders are removed, the system needs to suppor…
I was asked one question about designing a lottery system for customers that purchase items (each purchase casts a vote). Input is logs of the purchase history with item and customerid. Fleshed out a simple array approach for votes that are…
Implement a hash ring data structure, which is a consistent hashing ring that routes chat sessions to servers several levels: lvl 1: add/remove/get server lvl 2: virtual servers inside of a server lvl 3: server affinities, based on proximit…
Problem Statement you're in a city where cars uses special plat formats. The x-th license plate in a sequence that transitions through the following formats as each capacity is exhausted: 1. 00000 - 99999 2. A0000 - Z9999 3. AA000 - ZZ999 4…
Given a const int*, write a function and function call that causes printing the dereferenced pointer to print 42. example: given something like const int* x; you want to write a function such that f(...) and then after this function call, p…
Interviewed for squarepoint swe in emea region was asked to implement vector class starting off with the push_back() function then other functions of similar complexity as an extension
Construct the optimal unbiased estimator for some random variable p', where p' is the probability that 5 i.i.d. RV p all fail together For each day, the probability of a machine failing is p. Estimate the probability p' of 5 of these machin…
I interviewed for roblox SWE intern positon back in nov 2025, this is word for word the details for said problem, This question is asked right after solving another similar DSA problem for the,. Imagine a number line containing coordinates…
This is word for word the details they lay out for you to answer this problem. You are given an array memory consisting only of 0s and 1s. memory[i] = 0 means the memory unit is free. memory[i] = 1 means the memory unit is occupied. Memory…
I interviewed for a core AWS security team. The first interview was composed of a BFS/DFS proble. Even though the leetcode was easy, being a security team I was asked about stack overflow, memory management and how to parallelize it. The ac…
path with minimum effort on leetcode i solve with dijkstra
Implement a rate limiter. First with easy constraints, then large constraints on the size of the blocks that can be passed in
Given a data stream, calculate the rolling correlation of the data stream. started out by doing the easy naive where you just add X, Y, XX and YY and then was told to optimize it to be numerically stable, where I would need Welford's algori…
What is the difference between function overloading and function overriding? Given some code, can you write some examples of both?
Given some example code for an ObjectPool, debug it and add some additional features.
Design tic-tac-toe, RLE iterator tic tac toe is just a simple state machine (messed up on some logic but it was fine) RLE iterator was easy, just expand upon construction and iterate like a normal array
maximize distance to closest person, literally check consecutive elements thats it also task scheduler, which was the heap question on leetcode where you want to interleave as many tasks as possible and keep n between tasks of the same id.…
Interviewed with Roblox, had a superday of 2 technical + 1 behavioral back-to-back. First interview was given an array of 0s and 1s, find the 1 that is furthest apart from any 0s/start/end. Second interview was given an array of integers, c…
I interviewed with Apple for a software engineering internship. There were 2 interviews, the second was coding and I got a LeetCode easy problem to check if a string is a palindrome, excluding spaces and special characters. I could choose a…
optimization #include <bits/stdc++.h> using namespace std; int root_node(const vector<int>& output) { if (output.empty()) return 0; constexpr long long INF = LLONG_MAX; int x = 0; int counter = 1; long long leaf = INF; // Sorted copy for O(…
Question: In surface-code syndrome extraction, why can the ordering of CNOT gates around a syndrome ancilla matter? A) It determines whether the surface code uses qubits or qutrits B) It can orient correlated hook errors so that they do not…
Question: In surface-code lattice surgery, what operation is most directly implemented by merging and splitting code patches? A) Arbitrary physical SWAP gates between every pair of data qubits B) Direct tomography of the full logical densit…
Question: In fault-tolerant quantum computation, what is the main idea of Pauli-frame tracking? A) Physically apply every Pauli correction immediately after each syndrome measurement B) Store pending Pauli corrections classically and reinte…
Question: Which statement best describes the role of a cluster state in measurement-based quantum computation? A) It is merely a classical lookup table for measurement angles B) It is an entangled resource state consumed by local measuremen…