GearsDiv2.java

import java.util.Arrays;

// Paste me into the FileEdit configuration dialog
// Single Round Match 589 - Round 1500.0
public class GearsDiv2 {
	private char[] charArrays;

	private int r(int p) {
		return p % charArrays.length;
	}
	//アイデアの参考: http://snuke.hatenablog.com/entry/2013/08/27/214629
	public int getmin(String Directions) {
		int min = Integer.MAX_VALUE;
		for (int j = 0; j < 2; j++) {
			charArrays = Directions.toCharArray();
			int count = 0;
			//最初と最後の文字が同じときは空白にする
			if (j == 1) {
				charArrays[0] = 0;
				count++;
			}
			for (int i = 0; i < charArrays.length; i++) {
				if (charArrays[i] == charArrays[r(i + 1)] && charArrays[i] != 0) {
					charArrays[r(i + 1)] = 0;
					count++;
				}
			}
			min = Math.min(count, min);
		}

		return min;
	}

	// BEGIN CUT HERE
	public static void main(String[] args) {
		if (args.length == 0) {
			GearsDiv2Harness.run_test(-1);
		} else {
			for (int i = 0; i < args.length; ++i)
				GearsDiv2Harness.run_test(Integer.valueOf(args[i]));
		}
	}
	// END CUT HERE
}

// BEGIN CUT HERE
class GearsDiv2Harness {
	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(int expected, int result) {
		return expected == result;
	}

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

	static int verifyCase(int casenum, int expected, int 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: {
			String Directions = "LRRR";
			int expected__ = 1;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}
		case 1: {
			String Directions = "RRR";
			int expected__ = 2;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}
		case 2: {
			String Directions = "LRLR";
			int expected__ = 0;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}
		case 3: {
			String Directions = "LRLLRRLLLRRRLLLL";
			int expected__ = 6;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}
		case 4: {
			String Directions = "RRRRRRRLRRRRRRRLRLRLLRLRLRLRRLRLRLLLRLRLLRLLRRLRRR";
			int expected__ = 14;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}

		// custom cases

		case 5: {
			String Directions = "RRLLRR";
			int expected__ = 3;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}

		case 6: {
			String Directions = "RRRRLLLRLLR";
			int expected__ = 4;

			return verifyCase(casenum__, expected__,
					new GearsDiv2().getmin(Directions));
		}

		/*
		 * case 7: { String Directions = ; int expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * GearsDiv2().getmin(Directions)); }
		 */
		default:
			return -1;
		}
	}
}

// END CUT HERE