题目 Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. [28] Implement strStr() LeetCode
题目 Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. The order of elements can be changed. It doesn’t matter what you leave beyond the new length. [27] Remove Element LeetCode
题目 Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. [26] Remove Duplicates from Sorted Array LeetCode
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