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28. Implement strStr() Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 阅读全文
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27. Remove Element Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate extra space for 阅读全文
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26. Remove Duplicates from Sorted Array Given a sorted array, remove the duplicates in place such that each element appear only once and return the ne 阅读全文
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25. Reverse Nodes in k-Group Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer 阅读全文