Ontario Teachers' Pension Plan Board Interview Questions and Answers

Solving Monty Hall problem using Bayesian probability

• Assign prior probabilities to each door

• Update probabilities based on host's action

• Calculate posterior probabilities and choose the door with highest probability

• Example: If prior probability of winning behind each door is 1/3, and host opens a door with a goat, the posterior probability of winning behind the remaining door is 2/3

• Example: Bayes' theorem can be used to ...read more

I have knowledge of various DS, but I personally like Decision Trees.

• I have worked with Linear Regression, Logistic Regression, Random Forest, and Decision Trees.

• Decision Trees are easy to interpret and visualize.

• They can handle both categorical and numerical data.

• They can be used for both classification and regression problems.

• An example of using Decision Trees is in predicting customer churn for a telecom company.

Hashing is a technique to convert data of arbitrary size to a fixed size. Hash table is a data structure that uses hashing to store data.

• Hashing is used to index and retrieve items in a database because it is faster than other methods.

• Hash table is a data structure that uses a hash function to map keys to array indices.

• Hashing key is the input to the hash function that produces a hash value.

• Hashing is used in password ...read more

My day has been productive, and my previous interviews were insightful, helping me refine my skills and approach.

• Started the day with a refreshing morning routine, which included a workout and a healthy breakfast.

• Had a productive interview earlier, where I discussed my analytical skills and how I approach problem-solving.

• Learned valuable feedback from my previous interviews, particularly on how to better articulate my ...read more

Stacks and queues are data structures used to store and manipulate collections of elements.

• Stacks follow the Last-In-First-Out (LIFO) principle, where the last element added is the first one to be removed.

• Queues follow the First-In-First-Out (FIFO) principle, where the first element added is the first one to be removed.

• Examples of stacks include the call stack in programming and the undo/redo feature in text editors.

• Ex...read more

Yes, queues can be implemented using stacks.

• To implement a queue using stacks, we can use two stacks.

• One stack is used for enqueue operation and the other for dequeue operation.

• When an element is enqueued, it is pushed onto the enqueue stack.

• When an element is dequeued, if the dequeue stack is empty, all elements from the enqueue stack are popped and pushed onto the dequeue stack in reverse order.

• This ensures that the ...read more

Yes, circular queues can be implemented using two stacks.

• Use two stacks, one for enqueue and one for dequeue operations.

• When enqueueing, push the element onto the enqueue stack.

• When dequeuing, if the dequeue stack is empty, pop all elements from the enqueue stack and push onto the dequeue stack.

• The front of the queue is the top element of the dequeue stack.

• When dequeueing, pop the top element from the dequeue stack.

• If ...read more

Yes, I know several sorting algorithms.

• One of the most popular is QuickSort, which uses a pivot element to divide the array into smaller sub-arrays and recursively sorts them.

• Another common algorithm is MergeSort, which divides the array into smaller sub-arrays and then merges them back together in sorted order.

• InsertionSort is a simple algorithm that iterates through the array and inserts each element into its correct...read more

I am a highly motivated individual with a passion for problem-solving and a strong work ethic.

• I have a degree in computer science and have worked as a software engineer for 3 years.

• I enjoy learning new technologies and am always looking for ways to improve my skills.

• In my free time, I like to read books on personal development and practice yoga.

• I am a team player and enjoy collaborating with others to achieve common go...read more

I have knowledge of various DS, but I personally like Decision Trees.

• I have worked with Linear Regression, Logistic Regression, Random Forest, and Decision Trees.

• Decision Trees are easy to interpret and visualize.

• They can handle both categorical and numerical data.

• They can be used for both classification and regression problems.

• An example of using Decision Trees is in predicting customer churn for a telecom company.

My day was good. Previous interviews were challenging but I learned a lot.

• Had a productive day at work

• Interviewed with two companies last week

• One interview was technical and the other was behavioral

• Received positive feedback from both companies

Stacks and queues are data structures used to store and manipulate collections of elements.

• Stacks follow the Last-In-First-Out (LIFO) principle, where the last element added is the first one to be removed.

• Queues follow the First-In-First-Out (FIFO) principle, where the first element added is the first one to be removed.

• Examples of stacks include the call stack in programming and the undo/redo feature in text editors.

• Ex...read more

Yes, we can implement queues using two stacks.

• We can use two stacks, one for enqueue operation and another for dequeue operation.

• To enqueue an element, push it onto the first stack.

• To dequeue an element, pop all elements from the first stack and push them onto the second stack, then pop the top element from the second stack.

• This ensures that the first element that was enqueued is the first one to be dequeued.

• Time compl...read more

Yes, we can implement circular queues using two stacks.

• We can use two stacks to implement a circular queue.

• One stack will be used for enqueue operation and the other for dequeue operation.

• When the enqueue stack is full, we can transfer all elements to the dequeue stack and vice versa.

• This way, we can maintain the circular nature of the queue.

• Example: https://www.geeksforgeeks.org/queue-using-stacks/

Heap sort is a comparison-based sorting algorithm that uses a binary heap data structure.

• It divides the input into a sorted and an unsorted region.

• It repeatedly extracts the maximum element from the unsorted region and inserts it into the sorted region.

• It has a worst-case time complexity of O(n log n).

Yes, I know other sorting algorithms.

• Examples: Merge Sort, Quick Sort, Heap Sort, Bubble Sort, Insertion Sort, Selection Sort

• Each algorithm has its own advantages and disadvantages.

• The choice of algorithm depends on the size of the data set and the desired time complexity.

Yes, I had a delicious sandwich for lunch.

• I had a sandwich for lunch

• It was delicious

• I also had a side of chips

• I drank water with my meal

I am a highly motivated individual with a passion for problem-solving and a strong work ethic.

• I have a degree in computer science and have worked as a software developer for the past 5 years.

• I am skilled in programming languages such as Java, Python, and C++.

• I have experience working on both front-end and back-end development projects.

• I am a quick learner and enjoy taking on new challenges.

• In my free time, I enjoy hiki...read more

Developed a web-based project management tool for a software company

• Used Agile methodology to develop the tool

• Implemented features such as task assignment, progress tracking, and team collaboration

• Designed a user-friendly interface with drag-and-drop functionality

• Integrated with third-party tools such as JIRA and Slack

• Received positive feedback from the client and increased team productivity

I recently studied the impact of social media on mental health.

• Explored the correlation between social media usage and depression/anxiety

• Researched the effects of cyberbullying on mental health

• Analyzed the role of social media in promoting positive mental health

• Reviewed studies on the benefits and drawbacks of social media use for mental health

• Examined strategies for promoting healthy social media habits

I would rate myself 8 in Java and 7 in database.

• I have extensive experience in Java programming and have worked on multiple projects using Java.

• I am proficient in database management and have worked with various database systems like MySQL and Oracle.

• I am constantly learning and improving my skills in both Java and database management.

• I have also completed relevant courses and certifications in Java and database manage...read more

Implementing a basic data structure in Java using arrays to manage a collection of strings.

• Use an array of strings to store data: String[] data = new String[10];

• Implement methods to add, remove, and retrieve strings from the array.

• Example of adding a string: data[index] = 'example';

• Consider resizing the array if it reaches capacity.

• Use a loop to iterate through the array for searching or displaying elements.

Enhancing efficiency involves optimizing processes, reducing waste, and leveraging technology for better outcomes.

• Identify bottlenecks: Analyze workflows to find slow points, e.g., a lengthy approval process.

• Automate repetitive tasks: Use software tools to handle data entry, e.g., using Excel macros.

• Streamline communication: Implement project management tools like Trello or Slack to improve team collaboration.

• Set clear...read more

I would like to work in the second phase as it involves implementation and execution.

• I prefer to work in the second phase as it involves putting the plan into action.

• I enjoy the hands-on experience of executing a project.

• The second phase allows me to see the results of my work and make necessary adjustments.

• For example, in a software development project, I would like to work in the second phase where I can code and tes...read more

I am a quick learner with excellent communication and problem-solving skills.

• Quick learner

• Excellent communication skills

• Strong problem-solving skills

The first month in a year is January.

• January is the first month in the Gregorian calendar.

• It has 31 days.

• It is named after the Roman god Janus.

It was a busy day filled with meetings and deadlines.

• Had multiple meetings with clients and team members

• Worked on completing a project before the deadline

• Managed to finish all tasks on my to-do list

Yes, the interviewers were very nice and welcoming.

• The interviewers greeted me warmly and made me feel comfortable.

• They asked questions in a friendly and conversational tone.

• They were patient and gave me time to think before answering.

• Overall, I had a positive experience with the interviewers.

Yes, I am prepared for 5-6 more interviews.

• I have researched the company and the position thoroughly.

• I have practiced answering common interview questions.

• I have prepared questions to ask the interviewer.

• I am mentally and physically prepared for the interviews.

• I am excited for the opportunity to showcase my skills and experience.

I found the PPT to be well-organized and visually appealing.

• The use of graphics and images helped to break up the text and keep my attention.

• The information was presented in a logical order, making it easy to follow.

• The color scheme was pleasing to the eye and not overwhelming.

• The charts and graphs were clear and easy to understand.

• Overall, the PPT was engaging and informative.

I have achieved several milestones in my career, including increasing sales revenue by 20% and leading a successful project team.

• Increased sales revenue by 20% through effective marketing strategies

• Led a successful project team to complete a complex project on time and within budget

• Received Employee of the Year award for outstanding performance and dedication

• Developed and implemented a new customer service program that...read more

I struggled to adjust to the new academic environment and workload in my first year.

• Transitioning from high school to college can be challenging

• I had to learn new study habits and time management skills

• I sought help from tutors and professors to improve my grades

I tend to overthink, struggle with time management, and can be too self-critical.

• Overthinking can lead to analysis paralysis and slow decision-making

• Time management can be improved through prioritization and delegation

• Self-criticism can hinder confidence and productivity

I don't have the available data.

• NO data available.

Nomura is a leading global financial services firm with a strong reputation and diverse range of opportunities.

• Nomura has a strong reputation in the financial services industry

• The firm offers a diverse range of opportunities for career growth

• Nomura has a global presence with offices in over 30 countries

• The company values diversity and inclusion in its workforce

• Nomura has a strong commitment to corporate social responsi...read more