摘要：
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Given nums = [-2, 0, 3, -5, 2, -1]... 阅读全文
摘要：
Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime c... 阅读全文
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344. Reverse String Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "olleh". clas... 阅读全文
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344. Reverse String Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "olleh". clas... 阅读全文
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Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation an... 阅读全文
摘要：
Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation an... 阅读全文