| Author: | Far-Eastern Subregional | Time limit: | 3 sec | |
| Input file: | input.txt | Memory limit: | 8 Mb | |
| Output file: | output.txt |
In some simplistic DBMS named PreQueL, the only column type allowed is CHAR(1) (a single character), and furthermore, its values are restricted to English upper- case letters (eAi to eZi). Table may contain up to 9 columns, numbered from 1 to 9. Tables themselves are named with lower-case English letters (eai to ezi).
The only database query possible first joins all the tables, then selects some rows according to conditions in one of two forms: either <column>=<value> or <column1>=<column2>, for example a2=A or b1=c4. All conditions must hold simultaneously, as if they were connected by eANDi operator.
You must write a PreQueL processor, which, given a tables and a set of conditions, will produce query result, i.e. those rows of a join satisfying all the conditions. Resulting rows must be sorted alphabetically.
The first line of input file contains of two integers o number of tables T and number of conditions D.
Starting from the second line there are T tables represented with number of rows RN and number of columns CN in the first line of a table, which is followed by RN lines consisting of exactly CN characters each. D lines with conditions follow the whole set of tables.
| No. | Input file (input.txt) |
Output file (output.txt) |
|---|---|---|
| 1 | |
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