First question on skype was to solve a string with duplicate numbers. They look for optimized solution so don't use 2 for loops, instead use hashset.
Second question on skype was to solve a fibonacciSeries.

In person interview: They asked design question to design a shopping list app with writing REST API's and DB schema.
Then they asked to solve two-sum algorithm

Question

First question on skype was to solve a string with duplicate numbers. They look for optimized solution so don't use 2 for loops, instead use hashset. 
Second question on skype was to solve a fibonacciSeries. 

In person interview: They asked design question to design a shopping list app with writing REST API's and DB schema. 
Then they asked to solve two-sum algorithm

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