EllysXors.java

// Paste me into the FileEdit configuration dialog

public class EllysXors {
	public long getXor(long L, long R) {
		long result = L;
		for (long i = L + 1; i <= R; i++) {
			result ^= i;
		}
		return result;
	}

	// BEGIN CUT HERE
	public static void main(String[] args) {
		if (args.length == 0) {
			EllysXorsHarness.run_test(-1);
		} else {
			for (int i = 0; i < args.length; ++i)
				EllysXorsHarness.run_test(Integer.valueOf(args[i]));
		}
	}
	// END CUT HERE
}

// BEGIN CUT HERE
class EllysXorsHarness {
	public static void run_test(int casenum) {
		if (casenum != -1) {
			if (runTestCase(casenum) == -1)
				System.err.println("Illegal input! Test case " + casenum + " does not exist.");
			return;
		}

		int correct = 0, total = 0;
		for (int i = 0;; ++i) {
			int x = runTestCase(i);
			if (x == -1) {
				if (i >= 100)
					break;
				continue;
			}
			correct += x;
			++total;
		}

		if (total == 0) {
			System.err.println("No test cases run.");
		} else if (correct < total) {
			System.err.println("Some cases FAILED (passed " + correct + " of " + total + ").");
		} else {
			System.err.println("All " + total + " tests passed!");
		}
	}

	static boolean compareOutput(long expected, long result) {
		return expected == result;
	}

	static String formatResult(long res) {
		return String.format("%d", res);
	}

	static int verifyCase(int casenum, long expected, long received) {
		System.err.print("Example " + casenum + "... ");
		if (compareOutput(expected, received)) {
			System.err.println("PASSED");
			return 1;
		} else {
			System.err.println("FAILED");
			System.err.println("    Expected: " + formatResult(expected));
			System.err.println("    Received: " + formatResult(received));
			return 0;
		}
	}

	static int runTestCase(int casenum) {
		switch (casenum) {
		case 0: {
			long L = 3L;
			long R = 10L;
			long expected__ = 8L;

			return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		}
		case 1: {
			long L = 5L;
			long R = 5L;
			long expected__ = 5L;

			return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		}
		case 2: {
			long L = 13L;
			long R = 42L;
			long expected__ = 39L;

			return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		}
		case 3: {
			long L = 666L;
			long R = 1337L;
			long expected__ = 0L;

			return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		}
		case 4: {
			long L = 1234567L;
			long R = 89101112L;
			long expected__ = 89998783L;

			return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		}

		// custom cases

		/*
		 * case 5: {
		 * long L = L;
		 * long R = L;
		 * long expected__ = L;
		 *
		 * return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		 * }
		 */
		/*
		 * case 6: {
		 * long L = L;
		 * long R = L;
		 * long expected__ = L;
		 *
		 * return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		 * }
		 */
		/*
		 * case 7: {
		 * long L = L;
		 * long R = L;
		 * long expected__ = L;
		 *
		 * return verifyCase(casenum, expected__, new EllysXors().getXor(L, R));
		 * }
		 */
		default:
			return -1;
		}
	}
}

// END CUT HERE