和为S的连续正数序列

ゝ一世哀愁。 2022-05-24 00:00 311阅读 0赞

这里写图片描述

import java.util.ArrayList;
public class Solution {
    //双指针思路
    public ArrayList<ArrayList<Integer> > FindContinuousSequence(int sum) {
        ArrayList<ArrayList<Integer> >arrayList =new ArrayList<>();
        if(sum<3){
            return  arrayList;
        }
        int pHigh=2,pLow=1;
        while(pHigh>pLow)
        {
             int cur=(pHigh+pLow)*(pHigh-pLow+1)/2;
             if(cur<sum)
                pHigh++;
             if(cur==sum){
                 ArrayList<Integer>arr=new ArrayList<Integer>();
                 for(int i=pLow;i<=pHigh;i++){
                      arr.add(i);
                 }
                 arrayList.add(arr);
                 pLow++;
             }
             if(cur>sum)
                pLow++;
        }
       return arrayList;
    }
    public static void main(String[]args){
        //System.out.println("Hello");
        int sum=100;
        Solution s=new Solution();
        ArrayList<ArrayList<Integer>>arr=s.FindContinuousSequence(sum);
        for(ArrayList<Integer>arr2:arr)
        {
              for(int i:arr2)
              {
                 System.out.print(i+" ");
              }
              System.out.println();
        }
    }
}