第二题三个距离最短数java版本：
public static void main(String[] args) {
int index = 0;
int[] nums = new int[]{33,44,61,2,36,42,56,81,11,17};
Arrays.sort(nums);
System.out.println();
int k = 3;
int sum ;
int min = nums[nums.length - 1] + nums[nums.length - 2]+nums[nums.length - 3];
System.out.println(min);
for(int i = 0;i < nums.length-3;i++){
sum = 0;
for(int j = i+1;j< i+k;j++){
sum = sum+(nums[j] - nums[j - 1]);
}
if (sum < min){
min = sum;
index = i;
}
}
for (int i = index;i < index + 3;i++)
System.out.println(nums[i] + " ");
}
