Product Development Engineer Interview Questions and Answers for Freshers

Calculate the total amount of rainwater that can be trapped within given elevation map.

• Iterate through the array to find the maximum height on the left and right of each bar.

• Calculate the amount of water that can be trapped above each bar by taking the minimum of the maximum heights on the left and right.

• Sum up the trapped water above each bar to get the total trapped water for the elevation map.

Find the first character that repeats in a given string.

• Iterate through the string and keep track of characters seen so far.

• If a character is already seen, return it as the first repeating character.

• If no repeating character is found, return null.

Use Twitter's public API to extract trending hashtags.

• Authenticate with Twitter API using OAuth 1.0a

• Make a GET request to the trends/place endpoint

• Extract the hashtags from the response and return as an array of strings