摘要：
Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. 最大连续子段和，经典动态规 阅读全文
摘要：
In a list of songs, the i-th song has a duration of time[i] seconds. Return the number of pairs of songs for which their total duration in seconds is 阅读全文