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That's not quite true, smithdwsn. You can use stdin and stdout in fread() and fwrite() in place of the file handler, and they'll work like scanf() and printf(), albeit in a lower level. You'll have to do your own parsing and formatting, but the speedup can be substantial. I chopped off almost 0.1s ...

Hi Mata,

I'm having some troubles with this problem, I get WA, I've try several test cases but can't get AC. Can you help find where my code fails?.

It seems there is indeed something wrong with your code. Experiment with this input:

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