29 lines
888 B
Plaintext
29 lines
888 B
Plaintext
// version 1.1.2
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val table = arrayOf(
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intArrayOf(0, 3, 1, 7, 5, 9, 8, 6, 4, 2),
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intArrayOf(7, 0, 9, 2, 1, 5, 4, 8, 6, 3),
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intArrayOf(4, 2, 0, 6, 8, 7, 1, 3, 5, 9),
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intArrayOf(1, 7, 5, 0, 9, 8, 3, 4, 2, 6),
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intArrayOf(6, 1, 2, 3, 0, 4, 5, 9, 7, 8),
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intArrayOf(3, 6, 7, 4, 2, 0, 9, 5, 8, 1),
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intArrayOf(5, 8, 6, 9, 7, 2, 0, 1, 3, 4),
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intArrayOf(8, 9, 4, 5, 3, 6, 2, 0, 1, 7),
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intArrayOf(9, 4, 3, 8, 6, 1, 7, 2, 0, 5),
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intArrayOf(2, 5, 8, 1, 4, 3, 6, 7, 9, 0)
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)
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fun damm(s: String): Boolean {
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var interim = 0
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for (c in s) interim = table[interim][c - '0']
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return interim == 0
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}
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fun main(args: Array<String>) {
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val numbers = intArrayOf(5724, 5727, 112946, 112949)
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for (number in numbers) {
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val isValid = damm(number.toString())
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println("${"%6d".format(number)} is ${if (isValid) "valid" else "invalid"}")
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}
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}
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