【Lintcode】013.strStr

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【Lintcode】013.strStr

题目: For a given source string and a target string, you should output the first index(from 0) of target string in source string. If target does not exist in source, just return -1. Clarification Do I need to implement KMP Algorithm in a real interview…

【lintcode】二分法总结 I

二分法:通过O(1)的时间,把规模为n的问题变为n/2.T(n) = T(n/2) + O(1) = O(logn). 基本操作:把长度为n的数组,分成前区间和后区间.设置start和end下标.int start = 0, end = nums.length - 1.循环结束条件为start + 1 < end ,即相邻时结束循环,所以最后需判断start和end中哪个是目标值.指针变化为start = mid,取后半区间:end = mid,取前半区间. 经典二分搜索:1. First p…

【leetcode】Implement strStr() (easy)

Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 思路: 注意,在for循环中条件有计算得到的负数时, 一定要把计算括起来转换为int, 否则会默认转换为uchar 负数就会被误认为是一个很大的数字. ; i < - ); ++i) 实现很常规: int strStr(string haystac…

【leetcode】Implement strStr()

Implement strStr() Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 最简单的思路,逐一比较: class Solution { public: int strStr(char *haystack, char *needle) { int n1=strlen(haystack);…

【Leetcode】【Easy】Implement strStr()

Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 解题: 本题为典型的KMP算法考察题,KMP算法描述为: 设主串S,匹配串P,i为S的索引下标,j为P的索引下标,初始i和j设置为0. 在i小于S的长度和j小于P的长度时,开始循环: 1.比较S[i]和P[j]是否相同: 2.如果相同则i++,j+…

【LeetCode】Implement strStr()(实现strStr())

这道题是LeetCode里的第28道题. 题目描述: 实现 strStr() 函数. 给定一个 haystack 字符串和一个 needle 字符串,在 haystack 字符串中找出 needle 字符串出现的第一个位置 (从0开始).如果不存在,则返回 -1. 示例 1: 输入: haystack = "hello", needle = "ll" 输出: 2 示例 2: 输入: haystack = "aaaaa", needle = &q…

【Lintcode】074.First Bad Version

题目: The code base version is an integer start from 1 to n. One day, someone committed a bad version in the code case, so it caused this version and the following versions are all failed in the unit tests. Find the first bad version. You can call isBa…