42 lines
933 B
Kotlin
42 lines
933 B
Kotlin
import java.io.StreamTokenizer
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import kotlin.math.pow
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class BinomialSuccessiveCalculator(val p: Double /* ensure 1 > p > 0*/, val n: Int /*300 >= n >= 1*/) {
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var cumulative: Double = 0.0
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var before: Double = 0.0
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var k: Int = -1
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val p_ratio = p / (1.0 - p)
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fun next() {
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if (k == -1) {
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before = (1 - this.p).pow(n)
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} else {
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before = before * (n - k).toDouble() / (k + 1).toDouble() * p_ratio
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}
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cumulative += before
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k++
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}
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fun minTrialToTrust(): Int {
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while (cumulative < 0.05) {
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next()
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}
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return this.k
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}
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}
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fun main() = with(StreamTokenizer(System.`in`.bufferedReader())) {
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nextToken()
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val 타율 = nval
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nextToken()
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val 타석 = nval.toInt()
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val bsc = BinomialSuccessiveCalculator(타율, 타석)
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println(bsc.minTrialToTrust())
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} |