1、字符串主要是字符串匹配、查找子串等1）最长公共前缀https://www.nowcoder.com/practice/28eb3175488f4434a4a6207f6f484f47?tpId=295&tqId=732&ru=/exam/oj&qru=/ta/format-top101/question-ranking&sourceUrl=%2Fexam%2Foj2）大数加法（字符计算）https://www.nowcoder.com/practice/11ae12e8c6fe48f883cad618c2e81475?tpId=295&tqId=1061819&ru=/exam/oj&qr...