开始的时候，下面的代码对于两边数字完全一样的情况，测试不通过。原因是heater会有重复情况，这时候对于飘红部分就不会往前面继续检查。所以把<改成<=让相同的情况也继续往前面走，走到最后一个，就可以了。Accepted!

package com.company;import java.util.Arrays;class Solution {    public int findRadius(int[] houses, int[] heaters) {        Arrays.sort(houses);        Arrays.sort(heaters);        int ret = Integer.MIN_VALUE;        int i = 0;        int hlen = heaters.length;        int tmp = Integer.MIN_VALUE;        for (int h: houses) {            while (i+1 < hlen && Math.abs(heaters[i+1]-h) <= Math.abs(heaters[i]-h)) {                i++;            }            if (Math.abs(heaters[i]-h) > ret) {                ret = Math.abs(heaters[i]-h);            }        }        return ret;    }}public class Main {    public static void main(String[] args) {        Solution solution = new Solution();        int[] houses = {1, 2, 2, 3, 4, 5};        int[] heaters = {1, 2, 2, 3, 4, 5};        int ret = solution.findRadius(houses, heaters);        System.out.printf("Done ret: %d\n", ret);    }}