| 41. | Use each row from the top input to build a hash table, and each row from the bottom input to probe into the hash table. Output all unique rows once. |
| 使用来自顶部输入的每一行创建哈希表，使用来自底部输入的每一行探测该哈希表。然后将所有不重复的行输出一次。 |
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| 42. | Use each row from the top input to build a hash table, and each row from the bottom input to probe into the hash table, outputting all matching rows. |
| 使用来自顶部输入的每一行创建哈希表，使用来自底部输入的每一行探测该哈希表。然后输出所有匹配行。 |
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