57.和为s的连续正数序列

https://leetcode-cn.com/problems/he-wei-sde-lian-xu-zheng-shu-xu-lie-lcof/

func findContinuousSequence(_ target: Int) -> [[Int]] {
    var result = [[Int]]()
    var l = 1
    var r = 2
    var sum = 0
    while l < r {
        sum = (l + r) * (r - l + 1) / 2
        if sum == target {
            result.append(createArr(l, r))
            l = l + 1
        } else if sum > target {
            l = l + 1
        } else if sum < target {
            r = r + 1
        }
    }
    return result
}

func createArr(_ start: Int, _ end: Int) -> [Int] {
    var result = [Int]()
    var startV = start
    
    while startV <= end {
        result.append(startV)
        startV = startV + 1
    }
    return result
}