题解 | #和为S的连续正数序列#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param sum int整型 
     * @return int整型ArrayList<ArrayList<>>
     */
    public ArrayList<ArrayList<Integer>> FindContinuousSequence (int sum) {
        // write code here
        ArrayList<ArrayList<Integer>> res = new ArrayList<>();
        if (sum == 0) return res;
        ArrayList<Integer> win = new ArrayList<>();
        int right = 1, left = 1;
        int t = 0;
        while (right < sum) {
            win.add(right);
            t += right;
            right ++ ;
            while (t > sum) {
                win.remove(0);
                t -= left;
                left ++ ;
            }
            if (t == sum) res.add(new ArrayList(win));
        }
        return res;
    }
}