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You've built an inflight entertainment system with on-demand movie streaming.
Users on longer flights like to start a second movie right when their first one ends, but they complain that the plane usually lands before they can see the ending. So you're building a feature for choosing two movies whose total runtimes will equal the exact flight length.
Write a function that takes an integer flightLength (in minutes) and an array of integers movieLengths (in minutes) and returns a boolean indicating whether there are two numbers in movieLengths whose sum equals flightLength.
When building your function:
Assume your users will watch exactly two movies
Don't make your users watch the same movie twice
Optimize for runtime over memory
We can do this in time, where n is the length of movieLengths.
Remember: your users shouldn't watch the same movie twice. Are you sure your function won’t give a false positive if the array has one element that is half flightLength?
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