Way to check the output for the very large inputs on my computer

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1

Do anyone know the way to check the outputs for the inputs of the order 10^9 …Provided I have the input file of 10^9 numbers.Because when I try using command prompt or by file input from the program itself there is a stack overflow in my computer

2

use this

freopen("inputfilename","r",stdin);
freopen("outputfilename","w",stdout);
3

Not working still stack overflow

4

share the code please.

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