| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 45 | 45 字符串去重并映射零值 | 0 / 0 | (None) | |
| 47 | 47 字符串长度映射统计 | 0 / 0 | (None) | |
| 48 | 48 字符串首尾字符映射 | 0 / 0 | (None) | |
| 49 | 49 字符串首尾字符映射 | 0 / 0 | (None) | |
| 50 | 50 字符串首字符分组拼接 | 0 / 0 | (None) | |
| 51 | 51 字符串偶数次出现统计 | 0 / 0 | (None) | |
| 52 | 52 字符串出现次数统计 | 0 / 0 | (None) | |
| 53 | 53 字符串首字符匹配交换 | 0 / 0 | (None) | |
| 54 | 54 首字符匹配交换 | 0 / 0 | (None) |