結果

問題 No.2794 I Love EDPC-T
ユーザー 箱星
提出日時 2023-01-31 08:59:58
言語 Kotlin
(2.1.0)
結果
TLE  
実行時間 -
コード長 4,079 bytes
コンパイル時間 22,015 ms
コンパイル使用メモリ 453,696 KB
実行使用メモリ 156,476 KB
最終ジャッジ日時 2024-12-20 21:13:39
合計ジャッジ時間 125,832 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2 TLE * 1
other AC * 7 TLE * 24
権限があれば一括ダウンロードができます

ソースコード

diff # 

import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val n = nextInt()
    val s = nextLine()
    val p = (1..n).toMutableList()
    var ans = 0
    loop@ do {
        for (i in 0 until n - 1) {
            if (s[i] == '<' && p[i] > p[i + 1]) {
                continue@loop
            }
            if (s[i] == '>' && p[i] < p[i + 1]) {
                continue@loop
            }
        }
        if (lis(p.toTypedArray()) != 2) {
            continue@loop
        }
        ans++
    } while (nextPermutation(p))
    println(ans)
}

fun nextPermutation(lst: MutableList<Int>): Boolean {
    val n = lst.size
    for (i in n - 2 downTo 0) {
        if (lst[i] < lst[i + 1]) {
            for (j in n - 1 downTo i + 1) {
                if (lst[j] > lst[i]) {
                    lst[i] = lst[j].also { lst[j] = lst[i] }
                    val tmpArray = lst.takeLast(n - (i + 1)).sorted()
                    tmpArray.forEachIndexed { index, e ->
                        lst[i + 1 + index] = e
                    }
                    return true
                }
            }
        }
    }
    return false
}

// region ModInt
class ModInt(x: Long) {
    companion object {
        //const val MOD = 1000000007L
        const val MOD = 998244353L
    }

    constructor(y: Int) : this(y.toLong())

    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"
    }
}

fun Long.toModInt(): ModInt {
    return ModInt(this)
}

fun Int.toModInt(): ModInt {
    return ModInt(this)
}

fun binomSimple(n: Long, k: Long): ModInt {
    var numer = ModInt(1)
    var denom = ModInt(1)
    for (i in 0 until k) {
        numer *= ModInt(n - i)
        denom *= ModInt(k - i)
    }
    return numer / denom
}
// endregion

//広義のLIS
fun lis(a: Array<Int>): Int {
    val lst = mutableListOf<Int>()
    for (v in a) {
        if ((lst.lastOrNull() ?: -1) <= v) {
            lst.add(v)
        } else {
            if (lst[0] > v) {
                lst[0] = v
            } else {
                var left = 0
                var right = lst.size - 1
                while (right - left > 1) {
                    val mid = (left + right) / 2
                    if (lst[mid] < v) {
                        left = mid
                    } else {
                        right = mid
                    }
                }
                lst[right] = v
            }
        }
    }
    return lst.size
}

fun main() {
    Thread(null, {
        val writer = PrintWriter(System.out, false)
        writer.solve()
        writer.flush()
    }, "solve", abs(1L.shl(26)))
        .apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } }
        .apply { start() }.join()
}

// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()

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()
// endregion
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