โจทย์เลข ป.4

MathCalc.kt

fun calc() {
    val ans = mutableListOf<Double>()
    do {
        val random8 = mutableListOf<Int>()
        for (i in 1..8) {
            random8.add(Random.nextInt(0, 9 + 1))
        }

        fun charToRandomNumber(ch: Char) = random8[ch.toByte() - 65]
        fun transformDigit(digit: Int, ch: Char) = 10.0.pow(digit - 1) * charToRandomNumber(ch)
        fun strToNumber(str: String) = str.toList()
                .mapIndexed { index, ch -> transformDigit(4 - index, ch) }
                .sum()

        val input = arrayListOf("AFBF", "CGHB", "DAFG", "AEAB")
        val output = "BCDC"

        val actual = strToNumber(input[0]) + strToNumber(input[1]) + strToNumber(input[2]) + strToNumber(input[3])
        val expected = strToNumber(output)
        val matched = actual == expected
        if (matched && !ans.contains(actual)) {
            ans.add(actual)
            val a2h = random8.mapIndexed { index, i -> "${(index + 65).toChar()}=$i" }.joinToString(", ")
            println("Ans#${ans.size} --> actual=$actual, expected=$expected [$a2h]")
        }
    } while (ans.size < 100)
}

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