package paixu;

import java.util.Arrays;

public class redixSort {
	public static int max(int[] arr){
		int maxs = -1;
		for(int i=0;i<arr.length;i++){
			if(maxs < arr[i]){
				maxs = arr[i];
			}
		}
		return maxs;
	}
	public static int getMaxDigit(int maxs){
		int res = 0;
		while(maxs > 0){
			
			maxs = maxs/10;
			res++;
		}
		return res;
	}
	public static void redix_Sort(int[] arr,int L,int R,int digit){
		final int redix = 10;
		int i = 0;
		int j = 0;
		//准备多少个辅助数组
		int[] bucket = new int[R - L +1];
		for(int d = 1;d <= digit ; d++){
			int[] count = new int[redix];//count[0...9]
			for(i = L;i<=R;i++){
				j = getDigit(arr[i],d);
				count[j]++;
				
			}
			for(i = 1;i<redix;i++){
				count[i] += count[i-1];
			}
			for(i = R;i>=L;i--){
				j = getDigit(arr[i],d);
				bucket[count[j]-1] = arr[i];
				count[j] -=1;
			} 
			for(i = L,j = 0;i<=R;i++,j++){
				arr[i] = bucket[j];
			}
			System.out.println(Arrays.toString(arr));
		}
		
	}
	public static int getDigit(int x,int d){
		return ((x / (int)Math.pow(10, d-1))%10);
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int[] arr = {12,87,65,94,56,23,85,22,54,63,189,256,378,1000,1006};
		int max = max(arr);
		int digit = getMaxDigit(max);
		redix_Sort(arr,0,arr.length-1,digit);
		}

}