Amazon Quality Assurance Engineer interview questions

1. Test case Enumeration: Euumerats all possible test scenerios includinng negative cases, please note the coverage of test case is more important than the no. of thest cases. Scenario- 'Credit Card Authentication' 2. Write an optimal program in any language to remove the duplicate char in the string. eg: i/p call taxi o/p: cal taxi 3.You are given an array containing both +ve and -ve integers & required to find the contiguous sub array with the largest sum. Eg: if i/p is(-10,2,3,-2,0,5,-15) sum is 8 4. Test data generation: Write test data for function which calcuates the time difference between the start & end time. Calculate time difference(Start time, End Time) Accepted time format for sstart and end time is 24 hours format & i/p is accepted in hh:mm:ss 5. Debugging. Youtube is not playing the selected video. what could be the possible problem & how willyou debug the issue