Ex3

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

unsigned Abs(unsigned a, unsigned b) {
	if (a > b)
		return a - b;
	return b - a;
}

int main() {
	unsigned i, j, k, n, dist, distMaxim = 0;
	FILE *f;
	f = fopen("srv.in", "r");
	if (!f) return 0;
	fscanf(f, "%u", &n);
	for (k = 1; k <= n; k++) {
		fscanf(f, "%u%u", &i, &j);
		if (Abs(i, j) <= n)
			dist = Abs(i, j);
		else
			dist = 2 * n - Abs(i, j);
		if (dist > distMaxim)
			distMaxim = dist;
	}
	fclose(f);
	f = fopen("srv.out", "w");
	fprintf(f, "%u", distMaxim);
	fclose(f);
	return 0;
}