Boring count Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 787 Accepted Submission(s): 325 Problem Description You are given a string S consisting of lowercase letters, and your task is counting
参考网络文章,个人工作总结 题记:一般对字符串的操作有以下几种:求长度,截取字符串,拼接字符串,找字符串中某个字符的索引 1 expr 命令 1.1 定义 man 手册 Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be: ARG1 | ARG2 ARG1 , otherwise ARG2 ARG