java例程练习（数三退一[用数组模拟])

public class ThreeOut {
	public static void main(String[] args) { 
		boolean[] arr = new boolean[500];
		for(int i = 0; i < arr.length; i++) {
			arr[i] = true;
		}
		
		int leftCount = arr.length;
		int countNum = 0;
		int index = 0;
		
		while(leftCount > 1) {
			if(arr[index] == true) {
				countNum ++;
				
				if(countNum == 3) {
					countNum = 0;
					arr[index] = false;
					leftCount --;
				}
			}
			
			index ++;
			
			if(index == arr.length) {
				index = 0;
			}
		}
		
		for(int i = 0; i < arr.length; i++) {
			if(arr[i] == true) {
				System.out.println(i + 1);
			}
		}
		
	}
}