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class Solution { public int strStr(String haystack, String needle) { if(needle == null || needle.length() <= 0){ return 0; } int hlen = haystack.length(); int nlen = needle.length(); if(hlen < .

ExponentiationTime Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 2798 Accepted Submission(s): 761 Problem DescriptionProblems involving the computatio...

A + B Problem IITime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4112 Accepted Submission(s): 1434 Problem DescriptionI have a very simple problem f...

题目描述请实现一个函数，将一个字符串中的空格替换成“%20”。例如，当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy。需要注意的是：传的是 StringBuffer 类型的字符串；代码如下：public String replaceSpace(StringBuffer str) { for(int i=0;i&lt;str.length();i++...