How can I speed up line by line reading of an ASCII file? (C++)

Question

Here\'s a bit of code that is a considerable bottleneck after doing some measuring:

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Answer 1

A proper implementation of the IO library would cache the data for you, avoiding excessive disk accesses and system calls. I recommend that you use a system-call level tool (e.g. strace if you're under Linux) to check what actually happens with your IO.

Obviously, dict.insert(xxx) could also be a nuisance if it doesn't allow O(1) insertion.