57.2.和为 s 的连续正数序列 (Easy)*

class Solution {
public:
    vector<vector<int>> findContinuousSequence(int target) {
        int start = 1, end = 2;
        int sum = 3;
        vector<vector<int>> res;
        while(end <= target / 2 + 1) {
            // cout << sum << endl;
            if(sum > target) {
                sum -= start;
                start++;
            }else if(sum < target) {
                end++;
                sum += end;
            }else {
                vector<int> tmp;
                for(int i = start; i <= end; i++) {
                    tmp.push_back(i);
                }
                res.push_back(tmp);
                sum -= start;
                start++, end++;
                sum += end;
            }
        }
        return res;
    }
};