Custom Checker

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#include <stdio.h>
#include <stdlib.h>

int main() {
	// File input.txt contains the judge input for current test case.	
	FILE *input;
	input = fopen("input.txt", "r");
	
	// File output.txt contains the output of the submitted code.
	// This is essentially the contents of stdout obtained by running the
	// submitted code for the current test case with the contents of the
	// above input.txt file as its stdin.
	FILE *output;
	output = fopen("output.txt", "r");
	
	// File answer.txt contains the judge output for current test case.
	// When authoring a problem, it is absolutely essential to provide a
	// valid and correct judge output even if custom checker code is 
	// sufficient on its own to determine the correctness of output.txt. 
	// This is because Toph determines the output limit based on the judge
	// output file for any test case (output limit is roughly twice the
	// number of bytes of this answer.txt file).
	FILE *answer;
	answer = fopen("answer.txt", "r");

	// Additionally, the source code of the submission itself will be
	// available in the current directory as source.txt.

	// Once the three files are open, you will need to check if the
	// contents of the output.txt file is correct.
	
	// ... check correctness here

	// If contents of output.txt is found to be correct, print a single
	// line to stdout with a single integer: 0. Otherwise print a positive
	// integer indicating the number of differences found. The exact value
	// is not of critical importance as any non-zero positive integer will
	// cause Toph to award the submission a Wrong Answer verdict - but the
	// the number itself will show up in the difference column in the back
	// submission view (only visible to admins and contest moderators).
	int n;
	printf("%d\n", n);

	return 0;
}