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Lucky Tickets

Details

In Russia, bus ticket numbers consist of 6 decimal digits. It is considered lucky when the sum of the first three digits equals the sum of the last three digits. The concept of lucky tickets can be extended to ticket numbering systems with even numbers of digits and arbitrary bases.

Each argument describes a ticket numbering system and consists of two numbers separated by a space. The first is the even number of digits. The second is the base of the numbering system (2-16). For each argument, output the total number of lucky tickets for the numbering system on a separate line.

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Compiled from AT&T syntax to x86-64 Linux. Use syscalls to write output. For accurate byte counts and syntax highlighting, please use the new editor.
Top-level programs are supported, args holds ARGV. Implicit using directives for console applications are enabled.
Arguments are available via STDIN, each argument is NULL terminated. Taking input after EOF leaves the cell unchanged, the tape is circular with 65536 cells, and cells are 8-bit with wrapping.
Arguments are available via STDIN, each argument is NULL terminated. x is a no-op.
Arguments are available via STDIN, each argument is NULL terminated.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
say() is available without any import.
$args to access the arguments.
prolog_flag(argv, Args) to access the arguments.
SELECT arg FROM argv to access the arguments, only the first column of the first result set will be printed, NULL values will be skipped, and the dialect is SQLite.
Arguments are available via args list variable. To terminate script execution, write and quit the current buffer.
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