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technical interview#1: Q: given a list of integers (with at least 3 elements) representing triangle sides, count all combinations that you might be able to build a triangle with (if side3 is the longest, then it should satisfy side1+side2 > side3).
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Research Scientist

Interviewed at Upstart

3.7★
Jul 6, 2021

technical interview#1: Q: given a list of integers (with at least 3 elements) representing triangle sides, count all combinations that you might be able to build a triangle with (if side3 is the longest, then it should satisfy side1+side2 > side3).

SQL A/B testing question: Q: You are tasked to analyze an experiment called thanksgiving-coupon. Instacart users in this experiment are randomly assigned to “incentive” group or “nonincentive” group. Users in the “incentives” group get an email with $10 off for their next order, and users in the “no incentives” group get an email reminding them to stock up groceries for the Thanksgiving weekend. The $10 off coupon expires on 11/29/2020 (Sunday) 11:59pm PST. How would you analyze this experiment? You have the table Experiments, which contains experiment assignments for Instacart users. Fields:
user_id
experiment: experiment name
group_ind: experiment group a user is assigned to
assigned_at_utc: assignment timestamp. You also have the Orders table, which contains all orders from a user. Fields:
user_id
 order_id
 order_created_timestamp_utc
 order_amount_usd You can use this code to convert time zones: order_created_timestamp_utc at time zone 'utc' at time zone 'pst' You also have the Coupon_spend table, which contains the redeemed thanksgiving-coupon for an order. Fields:
user_id
 order_id
 coupon_spend
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Senior Data Scientist

Interviewed at Instacart

3.6★
Jan 13, 2022

SQL A/B testing question: Q: You are tasked to analyze an experiment called thanksgiving-coupon. Instacart users in this experiment are randomly assigned to “incentive” group or “nonincentive” group. Users in the “incentives” group get an email with $10 off for their next order, and users in the “no incentives” group get an email reminding them to stock up groceries for the Thanksgiving weekend. The $10 off coupon expires on 11/29/2020 (Sunday) 11:59pm PST. How would you analyze this experiment? You have the table Experiments, which contains experiment assignments for Instacart users. Fields:
user_id
experiment: experiment name
group_ind: experiment group a user is assigned to
assigned_at_utc: assignment timestamp. You also have the Orders table, which contains all orders from a user. Fields:
user_id
 order_id
 order_created_timestamp_utc
 order_amount_usd You can use this code to convert time zones: order_created_timestamp_utc at time zone 'utc' at time zone 'pst' You also have the Coupon_spend table, which contains the redeemed thanksgiving-coupon for an order. Fields:
user_id
 order_id
 coupon_spend

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