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So it's one number per line, all integers, no delimiters.

So that makes things easier. Read in a line at a time using fgets().

But those numbers can get pretty big. If you use strtol() with the...

You need to nail down the format of the input file.

Presumably it's line-oriented, with a variable number of numbers on each line. Are they all integers? How are they separated? If they are...