FINDTEXT - NTUcoder problem 5548

findtext.c

/*
 * Trò chơi tìm chữ 3 <http://laptrinh.ntu.edu.vn/Problem/Details/5548>
 *
 * Copyright (C) 2016 Raphael McSinyx
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

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

int main()
{
	char *x = malloc(10000000);
	scanf("%s", x);

	long len = strlen(x) / 2 + 1, i, idx = 0;
	char *dup;
	char *s = malloc(len);
	for (i = 1; i < len; i++) {
		s[i - 1] = x[i - 1];
		s[i] = 0;
		dup = strstr(x + i, s);

		if (dup == NULL)
			break;
		else
			idx = dup - x;
	}

	printf("%ld %ld\n", i - 1, idx + 1);
	return 0;
}