BM22 比较版本号
https://www.nowcoder.com/practice/2b317e02f14247a49ffdbdba315459e7
https://www.nowcoder.com/practice/2b317e02f14247a49ffdbdba315459e7
https://www.nowcoder.com/practice/c3120c1c1bc44ad986259c0cf0f0b80e
https://www.nowcoder.com/practice/e297fdd8e9f543059b0b5f05f3a7f3b2
JZ2 替换空格
https://www.nowcoder.com/practice/fe6b651b66ae47d7acce78ffdd9a96c7
https://www.nowcoder.com/practice/1c82e8cf713b4bbeb2a5b31cf5b0417c
https://www.nowcoder.com/practice/12d959b108cb42b1ab72cef4d36af5ec
https://www.nowcoder.com/practice/3194a4f4cf814f63919d0790578d51f3
https://www.nowcoder.com/practice/1277c681251b4372bdef344468e4f26e
https://www.nowcoder.com/practice/28970c15befb4ff3a264189087b99ad4
https://www.nowcoder.com/practice/e69148f8528c4039ad89bb2546fd4ff8
https://www.nowcoder.com/practice/00de97733b8e4f97a3fb5c680ee10720
https://www.nowcoder.com/practice/11ae12e8c6fe48f883cad618c2e81475
https://www.nowcoder.com/practice/c3a6afee325e472386a1c4eb1ef987f3
https://www.nowcoder.com/practice/b4525d1d84934cf280439aeecc36f4af
https://www.nowcoder.com/practice/37548e94a270412c8b9fb85643c8ccc2