src/main/java/wycc/util/ArrayUtils.java
public static int[] range(int start, int end) {
		if (end <= start) {
			return new int[0];
		} else {
			int[] rs = new int[Math.abs(end - start)];
			for (int i = start; i < end; ++i) {
				rs[i - start] = i;
			}
			return rs;
		}
	}
public static int[] range(int start, int end) {
		if (end <= start) {
			return new int[0];
		} else {
			int[] rs = new int[Math.abs(end - start)];
			for (int i = start; i < end; ++i) {
				rs[i - start] = i;
			}
			return rs;
		}
	}
Return an integer array containing consecutive integers from a given
start value upto (but not including) a given end value.

@param start
The start value from which the range begins. This value is
always the first element of the final array (assuming it's not
empty).
@param end
The value up to which (exclusively) the range extends. This
value is not in the final array. If this value equals or is
less than the start value, then the empty array is returned.
@return