Position: Software Engineer, Full Stack/Developer Experience

1. Introduce what they are working on
2. Technical Questions
   1. Merge two sorted array: just describe the algorithm and time complexity
   2. Merge K sorted array: write the code.
   3. Two Sum: an sorted array, find if there is at least a pair of two elements which the sum equals 0. Just describe the algorithm and time complexity.
      I gave him two approaches: using HashMap and two pointers.
      Then he asked me to write the code with two pointers.
   4. Three Sum: just describe the algorithm and time complexity.

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