In the previous contest I submitted a solution which got accepted but right now it says "Time limit exceeded". When I try to resubmit it, it keeps failing test 5. Any ideas why it's not efficient enough?
In the previous contest I submitted a solution which got accepted but right now it says "Time limit exceeded". When I try to resubmit it, it keeps failing test 5. Any ideas why it's not efficient enough?
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unordered_sets are slow. you shouldn't use them
std::find(begin, end)works in linear time, not constant time, it cannot exploit any internal structure of the container. Use container's methods.Should be easy to reproduce with a big local test.