Month: 8 月 2017

Implement strStr().

Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

题目大意：实现一个子串查找函数

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Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0?

Find all unique triplets in the array which gives the sum of zero.

题目大意：找到三个数的和为0.

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