Google-Subarray Sum to Target


Google-Subarray Sum to Target

给一个数组和一个target, 找有没有subarray的和为target

[Solution]
全是正数/负数：cumulative sum + two pointer window
有正有负：Cumulative Sum + Two Sum

[Note]
正负数的时候cumulative sum不是递增的
两种情况都要先计算cumulative sum，即使全正/全负也不代表数组就是sorted的，不能直接two points.

[Time Space]
O(n) time, O(n) space


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