1 import java.util.ArrayList;
 2 public class Solution {
 3     public ArrayList<ArrayList<Integer> > FindContinuousSequence(int sum) {
 4         ArrayList<ArrayList<Integer>> al = new ArrayList<ArrayList<Integer>>();
 5          if(sum<3)
 6              return al;
 7          int small = 1;//小值
 8          int big = 2;//大值
 9          int middle = (sum+1)/2;//中间值
10          int curSum = small+big;
11          while(small < middle){
12              //循环直到小于sum
13              while(curSum < sum){
14                  big++;
15                  curSum += big;
16              }
17              //如果等于sum 则添加到al中
18              if(curSum == sum){
19                  ArrayList<Integer> temp = new ArrayList<>();
20                  for(int i = small; i <= big; i++)
21                      temp.add(i);
22                  al.add(temp);
23              }
24              //如果大于sum 则增大small
25              curSum -= small;
26              small++;
27          }
28          return al;
29     }
30 }