| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 3 | 3 字符串星号消除 | 0 / 0 | (None) | |
| 4 | 4 字符串单词替换为加号 | 0 / 0 | (None) | |
| 5 | 5 字符串查找与字符提取 | 0 / 0 | (None) | |
| 299 | 299 字符串字符重复 | 0 / 0 | (None) | |
| 300 | 300 统计子串'hi'出现次数 | 0 / 0 | (None) | |
| 301 | 301 字符串子串计数比较 | 0 / 0 | (None) | |
| 302 | 302 字符串特定模式计数 | 0 / 0 | (None) | |
| 303 | 303 字符串末尾匹配(忽略大小写) | 0 / 0 | (None) | |
| 304 | 304 字符串子串条件检查 | 0 / 0 | (None) | |
| 305 | 305 查找特定模式的3字符子串 | 0 / 0 | (None) | |
| 306 | 306 判断字符串xy平衡性 | 0 / 0 | (None) | |
| 308 | 308 字符串交错合并 | 0 / 0 | (None) | |
| 309 | 309 字符串截取与重复 | 0 / 0 | (None) | |
| 310 | 310 字符串递减截取拼接 | 0 / 0 | (None) | |
| 311 | 311 字符串重复与连接 | 0 / 0 | (None) | |
| 312 | 312 字符串前缀查找 | 0 / 0 | (None) | |
| 313 | 313 判断子串“xyz”是否居中 | 0 / 0 | (None) | |
| 314 | 314 提取字符串夹心 | 0 / 0 | (None) | |
| 315 | 315 星号相邻字符判断 | 0 / 0 | (None) | |
| 316 | 316 字符串三字符重排 | 0 / 0 | (None) | |
| 317 | 317 字符串模式匹配与修改 | 0 / 0 | (None) |