Amazon Software Engineer interview questions

Was asked three puzzles and i was so nervous couldnt answer completely correct. After the interview is over i heard laughs from other side...felt so embarrassing and insulted.

I have taken two phone interviews. The first one goes well. The interviewee just asked some background, and then asked the coding questions. 1.. given a number, find two numbers from an array so that the sum is equal to that number; 2.. given a number, find three numbers from an array so that their sum is equal to that number; During the second interview, the interviewee directly asked the coding problems. 1. Given a file which contains 4 G integers, find an integer that doesn't exist in the file with a 4M memory computer 2. Given a sentence, and an output, write a function that takes the sentence and output the given results. I didn't do the first question well, and for the second one, I make some small mistakes. So I finally failed.