結果

問題 No.1081 和の和
ユーザー 箱星
提出日時 2020-06-19 21:24:09
言語 Kotlin
(2.1.0)
結果
AC  
実行時間 296 ms / 2,000 ms
コード長 2,923 bytes
コンパイル時間 13,997 ms
コンパイル使用メモリ 457,744 KB
実行使用メモリ 56,924 KB
最終ジャッジ日時 2024-07-03 13:40:57
合計ジャッジ時間 17,796 ms
ジャッジサーバーID
(参考情報)
judge4 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 8
権限があれば一括ダウンロードができます
コンパイルメッセージ
Main.kt:111:10: warning: parameter 'args' is never used
fun main(args: Array<String>) {
         ^

ソースコード

diff #
プレゼンテーションモードにする

import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.io.PrintWriter
import java.lang.IllegalArgumentException
import java.lang.StringBuilder
import java.util.*
// ModInt
// region
class ModInt(x: Long) {
companion object {
const val MOD = 1000000007L
//const val MOD = 998244353L
}
val x = (x % MOD + MOD) % MOD
operator fun plus(other: ModInt): ModInt {
return ModInt(x + other.x)
}
operator fun minus(other: ModInt): ModInt {
return ModInt(x - other.x)
}
operator fun times(other: ModInt): ModInt {
return ModInt(x * other.x)
}
operator fun div(other: ModInt): ModInt {
return this * other.inv()
}
fun pow(exp: Long): ModInt {
if (exp == 0L) return ModInt(1L)
var a = pow(exp shr 1)
a *= a
if (exp and 1L == 0L) return a
return this * a
}
fun inv(): ModInt {
return this.pow(MOD - 2)
}
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (javaClass != other?.javaClass) return false
other as ModInt
if (x != other.x) return false
return true
}
override fun hashCode(): Int {
return x.hashCode()
}
override fun toString(): String {
return "$x"
}
}
val fac = mutableListOf<ModInt>()
val invfac = mutableListOf<ModInt>()
fun fact(n: Long, b: Boolean): ModInt {
if (fac.count() == 0) {
fac.add(ModInt(1))
invfac.add(ModInt(1))
}
while (fac.count() <= n) {
fac.add(fac.last() * ModInt(fac.count().toLong()))
invfac.add(fac.last().inv())
}
return if (b) {
fac[n.toInt()]
} else {
invfac[n.toInt()]
}
}
fun comb(n: Long, k: Long): ModInt {
return fact(n, true) * fact(k, false) * fact(n - k, false)
}
fun comb2(n: Long, k: Long): ModInt {
var ans = ModInt(1)
for (i in 0 until k) {
ans = ans * ModInt(n - i) / ModInt(k - i)
}
return ans
}
// endregion
fun PrintWriter.solve(sc: FastScanner) {
val n = sc.nextInt()
val a = Array(n) { sc.nextInt() }
var ans = ModInt(0)
for (i in 0 until n) {
ans += ModInt(a[i].toLong()) * comb(n - 1L, i.toLong())
}
println(ans)
}
fun main(args: Array<String>) {
val writer = PrintWriter(System.out, false)
writer.solve(FastScanner(System.`in`))
writer.flush()
}
class FastScanner(s: InputStream) {
private var st = StringTokenizer("")
private val br = BufferedReader(InputStreamReader(s))
fun next(): String {
while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
return st.nextToken()
}
fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
fun ready() = br.ready()
}
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