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leecode之Implement strStr()
KMP算法的实现:#include #include #include int strStr(char* haystack, char* needle) { if (haystack == NULL || needle == NULL) return -1; if (nee...
分类:其他好文   时间:2015-05-29 11:41:11    阅读次数:89
leetcode_single number
题目描述 Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without...
分类:其他好文   时间:2015-05-28 23:16:30    阅读次数:173
leetcode 10 -- Regular Expression Matching
Regular Expression Matching 题目: Implement regular expression matching with support for ‘.’ and ‘*’. ‘.’ Matches any single character. ‘*’ Matches zero or more of the preceding element. Th...
分类:其他好文   时间:2015-05-28 21:31:52    阅读次数:197
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.Update (2014-11-02):The si...
分类:其他好文   时间:2015-05-28 09:21:06    阅读次数:115
leetcode 8 -- String to Integer (atoi)
String to Integer (atoi) 题目: Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourse...
分类:其他好文   时间:2015-05-27 15:50:24    阅读次数:134
Implement Trie (Prefix Tree)
完全抄答案class TrieNode { // Initialize your data structure here. // ref http://www.programcreek.com/2014/05/leetcode-implement-trie-prefix-tree-jav...
分类:其他好文   时间:2015-05-27 07:26:48    阅读次数:195
[LeetCode] Pow(x, n)
Pow(x, n)  Implement pow(x, n). 解题思路: 这里n是整数,注意可能是负数,因此需要先将其转化成正数。若直接用循环的方法做,会产生超时错误。我们可以这么做。比如求2^6,我们需要求2^(2*3)=4^3=4*4^2,这样时间复杂度为O(logn)。 注意几个特殊的情况,当n==1时,返回x本身,当n==0时,返回1,当n为偶数时,返回myPow(x*x...
分类:其他好文   时间:2015-05-27 01:03:28    阅读次数:309
categoriy 重写函数会怎样?
Fromcomp.lang.objective-C FAQ listing: "What if multiple categories implement the same method?Then the fabric of the Universe as we know it ceases to ...
分类:其他好文   时间:2015-05-26 12:26:34    阅读次数:195
在字符串中查找字符串 Strstr() StrstrSpan()
/* Description: The strstr function locates the firstoccurrence in the string pointed to by s1 of the sequence of characters(excluding the terminatingnull character)in the string pointed to by s2...
分类:其他好文   时间:2015-05-24 17:29:24    阅读次数:135
LeetCode的medium题集合(C++实现)十二
1 Sqrt(x) Implement int sqrt(int x).Compute and return the square root of x. 因为这里都是整数,可以直接采用二分法求解int mySqrt(int x) { if (x <= 1) return x; int begin = 1, end =x, mid = 0; while (begin...
分类:编程语言   时间:2015-05-24 13:00:28    阅读次数:173
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