#946606 (Nim) No.2616 中央番目の中央値

提出ソース
結果

問題	No.2616 中央番目の中央値
ユーザー	👑 seekworser
提出日時	2024-01-26 22:14:51
言語	Nim (2.0.2)
結果	AC
実行時間	304 ms / 2,000 ms
コード長	28,562 bytes
コンパイル時間	5,112 ms
コンパイル使用メモリ	93,684 KB
実行使用メモリ	29,668 KB
最終ジャッジ日時	2024-01-26 22:15:10
合計ジャッジ時間	11,085 ms
ジャッジサーバーID （参考情報）	judge13 / judge14
このコードへのチャレンジ
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テストケース

テストケース表示
入力	結果	実行時間実行使用メモリ
testcase_00	AC	2 ms 6,676 KB
testcase_01	AC	2 ms 6,676 KB
testcase_02	AC	2 ms 6,676 KB
testcase_03	AC	1 ms 6,676 KB
testcase_04	AC	1 ms 6,676 KB
testcase_05	AC	2 ms 6,676 KB
testcase_06	AC	2 ms 6,676 KB
testcase_07	AC	2 ms 6,676 KB
testcase_08	AC	2 ms 6,676 KB
testcase_09	AC	1 ms 6,676 KB
testcase_10	AC	2 ms 6,676 KB
testcase_11	AC	2 ms 6,676 KB
testcase_12	AC	2 ms 6,676 KB
testcase_13	AC	4 ms 6,676 KB
testcase_14	AC	4 ms 6,676 KB
testcase_15	AC	8 ms 6,676 KB
testcase_16	AC	15 ms 6,676 KB
testcase_17	AC	21 ms 6,676 KB
testcase_18	AC	35 ms 7,424 KB
testcase_19	AC	76 ms 11,264 KB
testcase_20	AC	76 ms 11,264 KB
testcase_21	AC	168 ms 20,188 KB
testcase_22	AC	267 ms 29,620 KB
testcase_23	AC	276 ms 29,668 KB
testcase_24	AC	195 ms 29,668 KB
testcase_25	AC	192 ms 29,668 KB
testcase_26	AC	261 ms 29,668 KB
testcase_27	AC	304 ms 29,668 KB
testcase_28	AC	264 ms 29,668 KB
testcase_29	AC	266 ms 29,668 KB
testcase_30	AC	266 ms 29,668 KB
testcase_31	AC	267 ms 29,668 KB
testcase_32	AC	276 ms 29,668 KB
testcase_33	AC	265 ms 29,668 KB
testcase_34	AC	264 ms 29,668 KB
testcase_35	AC	267 ms 29,668 KB
testcase_36	AC	274 ms 29,668 KB
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ソースコード

raw source code
import macros
macro Please(x): untyped = nnkStmtList.newTree()

Please use Nim-ACL
Please use Nim-ACL
Please use Nim-ACL



import macros;macro ImportExpand(s:untyped):untyped = parseStmt($s[2])
import macros
# {.checks: off.}
ImportExpand "cplib/tmpl/citrus.nim" <=== "when not declared CPLIB_TMPL_CITRUS:\n    const CPLIB_TMPL_CITRUS* = 1\n    {.warning[UnusedImport]: off.}\n    {.hint[XDeclaredButNotUsed]: off.}\n    import os\n    import algorithm\n    import sequtils\n    import tables\n    import macros\n    import std/math\n    import sets\n    import strutils\n    import strformat\n    import sugar\n    import streams\n    import deques\n    import bitops\n    import heapqueue\n    import options\n    const MODINT998244353* = 998244353\n    const MODINT1000000007* = 1000000007\n    const INF* = 100100111\n    const INFL* = int(3300300300300300491)\n    type double* = float64\n    let readNext = iterator(getsChar: bool = false): string {.closure.} =\n        while true:\n            var si: string\n            try: si = stdin.readLine\n            except EOFError: yield \"\"\n            for s in si.split:\n                if getsChar:\n                    for i in 0..<s.len():\n                        yield s[i..i]\n                else:\n                    if s.isEmptyOrWhitespace: continue\n                    yield s\n    proc input*(t: typedesc[string]): string = readNext()\n    proc input*(t: typedesc[char]): char = readNext(true)[0]\n    proc input*(t: typedesc[int]): int = readNext().parseInt\n    proc input*(t: typedesc[float]): float = readNext().parseFloat\n    macro input*(t: typedesc, n: varargs[int]): untyped =\n        var repStr = \"\"\n        for arg in n:\n            repStr &= &\"({arg.repr}).newSeqWith \"\n        parseExpr(&\"{repStr}input({t})\")\n    macro input*(ts: varargs[auto]): untyped =\n        var tupStr = \"\"\n        for t in ts:\n            tupStr &= &\"input({t.repr}),\"\n        parseExpr(&\"({tupStr})\")\n    macro input*(n: int, ts: varargs[auto]): untyped =\n        for typ in ts:\n            if typ.typeKind != ntyAnything:\n                error(\"Expected typedesc, got \" & typ.repr, typ)\n        parseExpr(&\"({n.repr}).newSeqWith input({ts.repr})\")\n    proc `fmtprint`*(x: int or string or char or bool): string = return $x\n    proc `fmtprint`*(x: float or float32 or float64): string = return &\"{x:.16f}\"\n    proc `fmtprint`*[T](x: seq[T] or Deque[T] or HashSet[T] or set[T]): string = return x.toSeq.join(\" \")\n    proc `fmtprint`*[T, N](x: array[T, N]): string = return x.toSeq.join(\" \")\n    proc `fmtprint`*[T](x: HeapQueue[T]): string =\n        var q = x\n        while q.len != 0:\n            result &= &\"{q.pop()}\"\n            if q.len != 0: result &= \" \"\n    proc `fmtprint`*[T](x: CountTable[T]): string =\n        result = x.pairs.toSeq.mapIt(&\"{it[0]}: {it[1]}\").join(\" \")\n    proc `fmtprint`*[K, V](x: Table[K, V]): string =\n        result = x.pairs.toSeq.mapIt(&\"{it[0]}: {it[1]}\").join(\" \")\n    proc print*(prop: tuple[f: File, sepc: string, endc: string, flush: bool], args: varargs[string, `fmtprint`]) =\n        for i in 0..<len(args):\n            prop.f.write(&\"{args[i]}\")\n            if i != len(args) - 1: prop.f.write(prop.sepc) else: prop.f.write(prop.endc)\n        if prop.flush: prop.f.flushFile()\n    proc print*(args: varargs[string, `fmtprint`]) = print((f: stdout, sepc: \" \", endc: \"\\n\", flush: false), args)\n    const LOCAL_DEBUG{.booldefine.} = false\n    macro getSymbolName(x: typed): string = x.toStrLit\n    macro debug*(args: varargs[untyped]): untyped =\n        when LOCAL_DEBUG:\n            result = newNimNode(nnkStmtList, args)\n            template prop(e: string = \"\"): untyped = (f: stderr, sepc: \"\", endc: e, flush: true)\n            for i, arg in args:\n                if arg.kind == nnkStrLit:\n                    result.add(quote do: print(prop(), \"\\\"\", `arg`, \"\\\"\"))\n                else:\n                    result.add(quote do: print(prop(\": \"), getSymbolName(`arg`)))\n                    result.add(quote do: print(prop(), `arg`))\n                if i != args.len - 1: result.add(quote do: print(prop(), \", \"))\n                else: result.add(quote do: print(prop(), \"\\n\"))\n        else:\n            return (quote do: discard)\n    proc `%`*(x: SomeInteger, y: SomeInteger): int = (((x mod y) + y) mod y)\n    proc `//`*(x: SomeInteger, y: SomeInteger): int = ((x - (x % y)) div y)\n    proc `^`*(x: SomeInteger, y: SomeInteger): int = x xor y\n    proc `&`*(x: SomeInteger, y: SomeInteger): int = x and y\n    proc `|`*(x: SomeInteger, y: SomeInteger): int = x or y\n    proc `>>`*(x: SomeInteger, y: SomeInteger): int = x shr y\n    proc `<<`*(x: SomeInteger, y: SomeInteger): int = x shl y\n    proc `%=`*(x: var SomeInteger, y: SomeInteger): void = x = x % y\n    proc `//=`*(x: var SomeInteger, y: SomeInteger): void = x = x // y\n    proc `^=`*(x: var SomeInteger, y: SomeInteger): void = x = x ^ y\n    proc `&=`*(x: var SomeInteger, y: SomeInteger): void = x = x & y\n    proc `|=`*(x: var SomeInteger, y: SomeInteger): void = x = x | y\n    proc `>>=`*(x: var SomeInteger, y: SomeInteger): void = x = x >> y\n    proc `<<=`*(x: var SomeInteger, y: SomeInteger): void = x = x << y\n    proc `[]`*(x, n: int): bool = (x and (1 shl n)) != 0\n    proc `[]=`*(x: var int, n: int, i: bool) =\n        if i: x = x or (1 << n)\n        else: (if x[n]: x = x xor (1 << n))\n    proc pow*(a, n: int, m = INFL): int =\n        var\n            rev = 1\n            a = a\n            n = n\n        while n > 0:\n            if n % 2 != 0: rev = (rev * a) mod m\n            if n > 1: a = (a * a) mod m\n            n >>= 1\n        return rev\n    proc sqrt*(x: int): int =\n        assert(x >= 0)\n        result = int(sqrt(float64(x)))\n        while result * result > x: result -= 1\n        while (result+1) * (result+1) <= x: result += 1\n    proc chmax*[T](x: var T, y: T): bool {.discardable.} = (if x < y: (x = y; return true; ) return false)\n    proc chmin*[T](x: var T, y: T): bool {.discardable.} = (if x > y: (x = y; return true; ) return false)\n    proc `max=`*[T](x: var T, y: T) = x = max(x, y)\n    proc `min=`*[T](x: var T, y: T) = x = min(x, y)\n    proc at*(x: char, a = '0'): int = int(x) - int(a)\n    converter tofloat*(n: int): float = float(n)\n    proc Yes*(b: bool = true): void = print(if b: \"Yes\" else: \"No\")\n    proc No*(b: bool = true): void = Yes(not b)\n    proc YES_upper*(b: bool = true): void = print(if b: \"YES\" else: \"NO\")\n    proc NO_upper*(b: bool = true): void = Yes_upper(not b)\n    const DXY* = [(0, -1), (0, 1), (-1, 0), (1, 0)]\n    const DDXY* = [(1, -1), (1, 0), (1, 1), (0, -1), (0, 1), (-1, -1), (-1, 0), (-1, 1)]\n    macro exit*(statement: untyped): untyped = (quote do: (`statement`; quit()))\n    discard\n"

# see https://github.com/zer0-star/Nim-ACL/tree/master/src/atcoder/modint.nim
ImportExpand "atcoder/modint.nim" <=== "when not declared ATCODER_MODINT_HPP:\n  const ATCODER_MODINT_HPP* = 1\n  import std/macros\n  #[ import atcoder/generate_definitions ]#\n  when not declared ATCODER_GENERATE_DEFINITIONS_NIM:\n    const ATCODER_GENERATE_DEFINITIONS_NIM* = 1\n    import std/macros\n  \n    type hasInv* = concept x\n      x.inv()\n  \n    template generateDefinitions*(name, l, r, typeObj, typeBase, body: untyped): untyped {.dirty.} =\n      proc name*(l, r: typeObj): auto {.inline.} =\n        type T = l.type\n        body\n      proc name*(l: typeBase; r: typeObj): auto {.inline.} =\n        type T = r.type\n        body\n      proc name*(l: typeObj; r: typeBase): auto {.inline.} =\n        type T = l.type\n        body\n  \n    template generatePow*(name) {.dirty.} =\n      proc pow*(m: name; p: SomeInteger): name {.inline.} =\n        when name is hasInv:\n          if p < 0: return pow(m.inv(), -p)\n        else:\n          doAssert p >= 0\n        if (p.type)(0) <= p:\n          var\n            p = p.uint\n            m = m\n          result = m.unit()\n          while p > 0'u:\n            if (p and 1'u) != 0'u: result *= m\n            m *= m\n            p = p shr 1'u\n      proc `^`*[T:name](m: T; p: SomeInteger): T {.inline.} = m.pow(p)\n  \n    macro generateConverter*(name, from_type, to_type) =\n      let fname = ident(\"to\" & $`name` & \"OfGenerateConverter\")\n      quote do:\n        type `name`* = `to_type`\n        converter `fname`*(a:`from_type`):`name` {.used.} =\n          `name`.init(a)\n    discard\n\n  type\n    StaticModInt*[M: static[int]] = object\n      a:uint32\n    DynamicModInt*[T: static[int]] = object\n      a:uint32\n\n  type ModInt* = StaticModInt or DynamicModInt\n#  type ModInt* = concept x, type T\n#    T is StaticModInt or T is DynamicModInt\n\n  proc isStaticModInt*(T:typedesc[ModInt]):bool = T is StaticModInt\n  proc isDynamicModInt*(T:typedesc[ModInt]):bool = T is DynamicModInt\n  #proc isModInt*(T:typedesc):bool = T.isStaticModInt or T.isDynamicModInt\n  proc isStatic*(T:typedesc[ModInt]):bool = T is StaticModInt\n  proc getMod*[M:static[int]](t:typedesc[StaticModInt[M]]):int {.inline.} = M\n\n\n  #[ import atcoder/internal_math ]#\n  when not declared ATCODER_INTERNAL_MATH_HPP:\n    const ATCODER_INTERNAL_MATH_HPP* = 1\n    import std/math\n  \n    # Fast moduler by barrett reduction\n    # Reference: https:#en.wikipedia.org/wiki/Barrett_reduction\n    # NOTE: reconsider after Ice Lake\n    type Barrett* = object\n      m*, im*:uint\n  \n    # @param m `1 <= m`\n    proc initBarrett*(m:uint):auto = Barrett(m:m, im:cast[uint](-1) div m + 1)\n  \n    # @return m\n    proc umod*(self: Barrett):uint =\n      self.m\n  \n    {.emit: \"\"\"\n  #include<cstdio>\n  inline unsigned long long calc_mul(const unsigned long long &a, const unsigned long long &b){\n    return (unsigned long long)(((unsigned __int128)(a)*b) >> 64);\n  }\n  \"\"\".}\n    proc calc_mul*(a,b:culonglong):culonglong {.importcpp: \"calc_mul(#,#)\", nodecl, inline.}\n    # @param a `0 <= a < m`\n    # @param b `0 <= b < m`\n    # @return `a * b % m`\n    proc quo*(self: Barrett, n:int | uint):int =\n      let n = n.uint\n      let x = calc_mul(n.culonglong, self.im.culonglong).uint\n      let r = n - x * self.m\n      return int(if self.m <= r: x - 1 else: x)\n    proc rem*(self: Barrett, n:int | uint):int =\n      let n = n.uint\n      let x = calc_mul(n.culonglong, self.im.culonglong).uint\n      let r = n - x * self.m\n      return int(if self.m <= r: r + self.m else: r)\n    proc quorem*(self: Barrett, n:int | uint):(int, int) =\n      let n = n.uint\n      let x = calc_mul(n.culonglong, self.im.culonglong).uint\n      let r = n - x * self.m\n      return if self.m <= r: (int(x - 1), int(r + self.m)) else: (int(x), int(r))\n  \n    proc pow*(self: Barrett, n:uint | int, p:int):int =\n      var\n        a = self.rem(n)\n        r:uint = if self.m == 1: 0 else: 1\n        p = p\n      while p > 0:\n        if (p and 1) != 0: r = self.mul(r, a.uint)\n        a = self.mul(a.uint, a.uint).int\n        p = p shr 1\n      return int(r)\n  \n    proc mul*(self: Barrett, a:uint, b:uint):uint {.inline.} =\n      # [1] m = 1\n      # a = b = im = 0, so okay\n  \n      # [2] m >= 2\n      # im = ceil(2^64 / m)\n      # -> im * m = 2^64 + r (0 <= r < m)\n      # let z = a*b = c*m + d (0 <= c, d < m)\n      # a*b * im = (c*m + d) * im = c*(im*m) + d*im = c*2^64 + c*r + d*im\n      # c*r + d*im < m * m + m * im < m * m + 2^64 + m <= 2^64 + m * (m + 1) < 2^64 * 2\n      # ((ab * im) >> 64) == c or c + 1\n      let z = a * b\n      #  #ifdef _MSC_VER\n      #      unsigned long long x;\n      #      _umul128(z, im, &x);\n      #  #else\n      ##TODO\n      #      unsigned long long x =\n      #        (unsigned long long)(((unsigned __int128)(z)*im) >> 64);\n      #  #endif\n      #let x = calc_mul(z.culonglong, self.im.culonglong).uint\n      #result = z - x * self.m\n      #if self.m <= result: result += self.m\n      return self.rem(z).uint\n  \n    # @param n `0 <= n`\n    # @param m `1 <= m`\n    # @return `(x ** n) % m`\n    proc pow_mod_constexpr*(x, n, m:int):int =\n      if m == 1: return 0\n      var\n        r = 1\n        y = floorMod(x, m)\n        n = n\n      while n != 0:\n        if (n and 1) != 0: r = (r * y) mod m\n        y = (y * y) mod m\n        n = n shr 1\n      return r.int\n    \n    # Reference:\n    # M. Forisek and J. Jancina,\n    # Fast Primality Testing for Integers That Fit into a Machine Word\n    # @param n `0 <= n`\n    proc is_prime_constexpr*(n:int):bool =\n      if n <= 1: return false\n      if n == 2 or n == 7 or n == 61: return true\n      if n mod 2 == 0: return false\n      var d = n - 1\n      while d mod 2 == 0: d = d div 2\n      for a in [2, 7, 61]:\n        var\n          t = d\n          y = pow_mod_constexpr(a, t, n)\n        while t != n - 1 and y != 1 and y != n - 1:\n          y = y * y mod n\n          t =  t shl 1\n        if y != n - 1 and t mod 2 == 0:\n          return false\n      return true\n    proc is_prime*[n:static[int]]():bool = is_prime_constexpr(n)\n  #  \n  #  # @param b `1 <= b`\n  #  # @return pair(g, x) s.t. g = gcd(a, b), xa = g (mod b), 0 <= x < b/g\n    proc inv_gcd*(a, b:int):(int,int) =\n      var a = floorMod(a, b)\n      if a == 0: return (b, 0)\n    \n      # Contracts:\n      # [1] s - m0 * a = 0 (mod b)\n      # [2] t - m1 * a = 0 (mod b)\n      # [3] s * |m1| + t * |m0| <= b\n      var\n        s = b\n        t = a\n        m0 = 0\n        m1 = 1\n    \n      while t != 0:\n        var u = s div t\n        s -= t * u;\n        m0 -= m1 * u;  # |m1 * u| <= |m1| * s <= b\n    \n        # [3]:\n        # (s - t * u) * |m1| + t * |m0 - m1 * u|\n        # <= s * |m1| - t * u * |m1| + t * (|m0| + |m1| * u)\n        # = s * |m1| + t * |m0| <= b\n    \n        var tmp = s\n        s = t;t = tmp;\n        tmp = m0;m0 = m1;m1 = tmp;\n      # by [3]: |m0| <= b/g\n      # by g != b: |m0| < b/g\n      if m0 < 0: m0 += b div s\n      return (s, m0)\n  \n    # Compile time primitive root\n    # @param m must be prime\n    # @return primitive root (and minimum in now)\n    proc primitive_root_constexpr*(m:int):int =\n      if m == 2: return 1\n      if m == 167772161: return 3\n      if m == 469762049: return 3\n      if m == 754974721: return 11\n      if m == 998244353: return 3\n      var divs:array[20, int]\n      divs[0] = 2\n      var cnt = 1\n      var x = (m - 1) div 2\n      while x mod 2 == 0: x = x div 2\n      var i = 3\n      while i * i <= x:\n        if x mod i == 0:\n          divs[cnt] = i\n          cnt.inc\n          while x mod i == 0:\n            x = x div i\n        i += 2\n      if x > 1:\n        divs[cnt] = x\n        cnt.inc\n      var g = 2\n      while true:\n        var ok = true\n        for i in 0..<cnt:\n          if pow_mod_constexpr(g, (m - 1) div divs[i], m) == 1:\n            ok = false\n            break\n        if ok: return g\n        g.inc\n    proc primitive_root*[m:static[int]]():auto =\n      primitive_root_constexpr(m)\n  \n    # @param n `n < 2^32`\n    # @param m `1 <= m < 2^32`\n    # @return sum_{i=0}^{n-1} floor((ai + b) / m) (mod 2^64)\n    proc floor_sum_unsigned*(n, m, a, b:uint):uint =\n      result = 0\n      var (n, m, a, b) = (n, m, a, b)\n      while true:\n        if a >= m:\n          result += n * (n - 1) div 2 * (a div m)\n          a = a mod m\n        if b >= m:\n          result += n * (b div m)\n          b = b mod m\n  \n        let y_max = a * n + b\n        if y_max < m: break\n        # y_max < m * (n + 1)\n        # floor(y_max / m) <= n\n        n = y_max div m\n        b = y_max mod m\n        swap(m, a)\n    discard\n\n  proc getBarrett*[T:static[int]](t:typedesc[DynamicModInt[T]]):ptr Barrett =\n    var Barrett_of_DynamicModInt {.global.} = initBarrett(998244353.uint)\n    return Barrett_of_DynamicModInt.addr\n  \n  proc getMod*[T:static[int]](t:typedesc[DynamicModInt[T]]):uint32 {.inline.} =\n    (t.getBarrett)[].m.uint32\n  proc setMod*[T:static[int]](t:typedesc[DynamicModInt[T]], M:SomeInteger){.inline.} =\n    (t.getBarrett)[] = initBarrett(M.uint)\n\n  proc val*(m: ModInt): int {.inline.} = int(m.a)\n\n  proc `$`*(m: StaticModInt or DynamicModInt): string {.inline.} = $(m.val())\n\n  template umod*[T:ModInt](self: typedesc[T] or T):uint32 =\n    when T is typedesc:\n      when T is StaticModInt:\n        T.M.uint32\n      elif T is DynamicModInt:\n        T.getMod()\n      else:\n        static: assert false\n    else: T.umod\n\n  template `mod`*[T:ModInt](self:typedesc[T] or T):int = T.umod.int\n\n  proc init*[T:ModInt](t:typedesc[T], v: SomeInteger or T): auto {.inline.} =\n    when v is T: return v\n    else:\n      when v is SomeUnsignedInt:\n        if v.uint < T.umod:\n          return T(a:v.uint32)\n        else:\n          return T(a:(v.uint mod T.umod.uint).uint32)\n      else:\n        var v = v.int\n        if 0 <= v:\n          if v < T.mod: return T(a:v.uint32)\n          else: return T(a:(v mod T.mod).uint32)\n        else:\n          v = v mod T.mod\n          if v < 0: v += T.mod\n          return T(a:v.uint32)\n  proc unit*[T:ModInt](t:typedesc[T] or T):T = T.init(1)\n\n  template initModInt*(v: SomeInteger or ModInt; M: static[int] = 1_000_000_007): auto =\n    StaticModInt[M].init(v)\n\n# TODO\n#  converter toModInt[M:static[int]](n:SomeInteger):StaticModInt[M] {.inline.} = initModInt(n, M)\n\n#  proc initModIntRaw*(v: SomeInteger; M: static[int] = 1_000_000_007): auto {.inline.} =\n#    ModInt[M](v.uint32)\n  proc raw*[T:ModInt](t:typedesc[T], v:SomeInteger):auto = T(a:v)\n\n  proc inv*[T:ModInt](v:T):T {.inline.} =\n    var\n      a = v.a.int\n      b = T.mod\n      u = 1\n      v = 0\n    while b > 0:\n      let t = a div b\n      a -= t * b;swap(a, b)\n      u -= t * v;swap(u, v)\n    return T.init(u)\n\n\n  proc `-`*[T:ModInt](m: T): T {.inline.} =\n    if int(m.a) == 0: return m\n    else: return T(a:m.umod() - m.a)\n\n  proc `+=`*[T:ModInt](m: var T; n: SomeInteger | T):T {.inline discardable.} =\n    m.a += T.init(n).a\n    if m.a >= T.umod: m.a -= T.umod\n    return m\n\n  proc `-=`*[T:ModInt](m: var T; n: SomeInteger | T):T {.inline discardable.} =\n    m.a -= T.init(n).a\n    if m.a >= T.umod: m.a += T.umod\n    return m\n\n  proc `*=`*[T:ModInt](m: var T; n: SomeInteger | T):T {.inline discardable.} =\n    when T is StaticModInt:\n      m.a = (m.a.uint * T.init(n).a.uint mod T.umod).uint32\n    elif T is DynamicModInt:\n      m.a = T.getBarrett[].mul(m.a.uint, T.init(n).a.uint).uint32\n    else:\n      static: assert false\n    return m\n\n  proc `/=`*[T:ModInt](m: var T; n: SomeInteger | T):T {.inline discardable.} =\n    m.a = (m.a.uint * T.init(n).inv().a.uint mod T.umod).uint32\n    return m\n\n  generateDefinitions(`+`, m, n, ModInt, SomeInteger):\n    result = T.init(m)\n    result += n\n\n  generateDefinitions(`-`, m, n, ModInt, SomeInteger):\n    result = T.init(m)\n    result -= n\n\n  generateDefinitions(`*`, m, n, ModInt, SomeInteger):\n    result = T.init(m)\n    result *= n\n\n  generateDefinitions(`/`, m, n, ModInt, SomeInteger):\n    result = T.init(m)\n    result /= n\n\n  generateDefinitions(`==`, m, n, ModInt, SomeInteger):\n    result = (T.init(m).val() == T.init(n).val())\n\n  proc inc*(m: var ModInt):ModInt {.inline discardable.} =\n    m.a.inc\n    if m.a == m.umod.uint32:\n      m.a = 0\n    return m\n  proc `++`*(m: var ModInt):ModInt {.inline discardable.} = m.inc\n\n  proc dec*(m: var ModInt):ModInt {.inline discardable.} =\n    if m.a == 0.uint32:\n      m.a = m.umod - 1\n    else:\n      m.a.dec\n    return m\n  proc `--`*(m: var ModInt):ModInt {.inline discardable.} = m.dec\n\n  generatePow(ModInt)\n  \n  # TODO: intのところはSomeIntegerに拡張したいがそうするとSystem.nimのuintのconverterとバッティングする。。。\n  template useStaticModint*(name, M) =\n    generateConverter(name, int, StaticModInt[M])\n  template useDynamicModInt*(name, M) =\n    generateConverter(name, int, DynamicModInt[M])\n\n  # TODO: Nimのstatic[int]を使うconverterがバグっていて個々に宣言しないとconverterが使えない\n  # したがって、下記以外のmodintを使う場合はuseStaticModIntあるいはuseDynamicModIntで宣言が必要\n  useStaticModInt(modint998244353, 998244353)\n  useStaticModInt(modint1000000007, 1000000007)\n  useDynamicModInt(modint, -1)\n\n  import std/math as math_lib_modint\n  proc estimateRational*(a:ModInt, ub:int = int(sqrt(float(ModInt.mod))), output_stderr:static[bool] = false):string =\n    var v:seq[tuple[s, n, d: int]]\n    for d in 1 .. ub:\n      var n = (a * d).val\n      # n or mod - n\n      if n * 2 > a.mod:\n        n = - (a.mod - n)\n      if gcd(n, d) > 1: continue\n      v.add((n.abs + d, n, d))\n    v.sort\n    when output_stderr:\n      stderr.write \"estimation result: \", v\n    return $v[0].n & \"/\" & $v[0].d\n\n  # TODO:\n  # Modint -> intのconverterあるとmint(2) * 3みたいなのがintになっちゃう\n  # converter toInt*(m: ModInt):int {.inline.} = m.val\n\n\n  discard\n"

# see https://github.com/zer0-star/Nim-ACL/tree/master/src/atcoder/segtree.nim
ImportExpand "atcoder/segtree.nim" <=== "when not declared ATCODER_SEGTREE_HPP:\n  const ATCODER_SEGTREE_HPP* = 1\n  #[ import atcoder/internal_bit ]#\n  when not declared ATCODER_INTERNAL_BITOP_HPP:\n    const ATCODER_INTERNAL_BITOP_HPP* = 1\n    import std/bitops\n  \n  #ifdef _MSC_VER\n  #include <intrin.h>\n  #endif\n  \n  # @param n `0 <= n`\n  # @return minimum non-negative `x` s.t. `n <= 2**x`\n    proc ceil_pow2*(n:SomeInteger):int =\n      var x = 0\n      while (1.uint shl x) < n.uint: x.inc\n      return x\n  # @param n `1 <= n`\n  # @return minimum non-negative `x` s.t. `(n & (1 << x)) != 0`\n    proc bsf*(n:SomeInteger):int =\n      return countTrailingZeroBits(n)\n    discard\n  import std/sequtils\n  import std/algorithm\n  #[ import atcoder/rangeutils ]#\n  when not declared ATCODER_RANGEUTILS_HPP:\n    const ATCODER_RANGEUTILS_HPP* = 1\n    type RangeType* = Slice[int] | HSlice[int, BackwardsIndex] | Slice[BackwardsIndex]\n    type IndexType* = int | BackwardsIndex\n    template halfOpenEndpoints*(p:Slice[int]):(int,int) = (p.a, p.b + 1)\n    template `^^`*(s, i: untyped): untyped =\n      (when i is BackwardsIndex: s.len - int(i) else: int(i))\n    template halfOpenEndpoints*[T](s:T, p:RangeType):(int,int) =\n      (s^^p.a, s^^p.b + 1)\n    discard\n\n  #{.push inline.}\n  type SegTree*[S; p:static[tuple]] = object\n    len*, size*, log*:int\n    d: seq[S]\n\n  template calc_op*[ST:SegTree](self:ST or typedesc[ST], a, b:ST.S):auto =\n    block:\n      let u = ST.p.op(a, b)\n      u\n  template calc_e*[ST:SegTree](self:ST or typedesc[ST]):auto =\n    block:\n      let u = ST.p.e()\n      u\n  proc update[ST:SegTree](self: var ST, k:int) =\n    self.d[k] = ST.calc_op(self.d[2 * k], self.d[2 * k + 1])\n\n  proc init*[ST:SegTree](self: var ST, v:seq[ST.S]) =\n    let\n      n = v.len\n      log = ceil_pow2(n)\n      size = 1 shl log\n    (self.len, self.size, self.log) = (n, size, log)\n    if self.d.len < 2 * size:\n      self.d = newSeqWith(2 * size, ST.calc_e())\n    else:\n      self.d.fill(0, 2 * size - 1, ST.calc_e())\n    for i in 0..<n: self.d[size + i] = v[i]\n    for i in countdown(size - 1, 1): self.update(i)\n  proc init*[ST:SegTree](self: var ST, n:int) =\n    self.init(newSeqWith(n, ST.calc_e()))\n  proc init*[ST:SegTree](self: typedesc[ST], v:seq[ST.S]):auto =\n    result = ST()\n    result.init(v)\n  proc init*[ST:SegTree](self: typedesc[ST], n:int):auto =\n    self.init(newSeqWith(n, ST.calc_e()))\n  template SegTreeType*[S](op0, e0:untyped):typedesc[SegTree] =\n    proc op1(l, r:S):S {.gensym inline.} = op0(l, r)\n    proc e1():S {.gensym inline.} = e0()\n    SegTree[S, (op:op1, e:e1)]\n  template getType*(ST:typedesc[SegTree], S:typedesc, op, e:untyped):typedesc[SegTree] =\n    SegTreeType[S](op, e)\n\n  template initSegTree*[S](v:seq[S] or int, op, e:untyped):auto =\n    SegTreeType[S](op, e).init(v)\n\n  proc set*[ST:SegTree](self:var ST, p:IndexType, x:ST.S) =\n    var p = self^^p\n    assert p in 0..<self.len\n    p += self.size\n    self.d[p] = x\n    for i in 1..self.log: self.update(p shr i)\n\n  proc get*[ST:SegTree](self:ST, p:IndexType):ST.S =\n    let p = self^^p\n    assert p in 0..<self.len\n    return self.d[p + self.size]\n\n  proc prod*[ST:SegTree](self:ST, p:RangeType):ST.S =\n    var (l, r) = self.halfOpenEndpoints(p)\n    assert 0 <= l and l <= r and r <= self.len\n    var\n      sml, smr = ST.calc_e()\n    l += self.size; r += self.size\n    while l < r:\n      if (l and 1) != 0: sml = ST.calc_op(sml, self.d[l]);l.inc\n      if (r and 1) != 0: r.dec;smr = ST.calc_op(self.d[r], smr)\n      l = l shr 1\n      r = r shr 1\n    return ST.calc_op(sml, smr)\n  proc `[]`*[ST:SegTree](self:ST, p:IndexType):auto = self.get(p)\n  proc `[]`*[ST:SegTree](self:ST, p:RangeType):auto = self.prod(p)\n  proc `[]=`*[ST:SegTree](self:var ST, p:IndexType, x:ST.S) = self.set(p, x)\n\n  proc all_prod*[ST:SegTree](self:ST):ST.S = self.d[1]\n\n#  proc max_right*[ST:SegTree, f:static[proc(s:ST.S):bool]](self:ST, l:int):auto = self.max_right(l, f)\n  proc max_right*[ST:SegTree](self:ST, l:IndexType, f:proc(s:ST.S):bool):int =\n    var l = self^^l\n    assert l in 0..self.len\n    assert f(ST.calc_e())\n    if l == self.len: return self.len\n    l += self.size\n    var sm = ST.calc_e()\n    while true:\n      while l mod 2 == 0: l = l shr 1\n      if not f(ST.calc_op(sm, self.d[l])):\n        while l < self.size:\n          l = (2 * l)\n          if f(ST.calc_op(sm, self.d[l])):\n            sm = ST.calc_op(sm, self.d[l])\n            l.inc\n        return l - self.size\n      sm = ST.calc_op(sm, self.d[l])\n      l.inc\n      if not ((l and -l) != l): break\n    return self.len\n\n#  proc min_left*[ST:SegTree, f:static[proc(s:ST.S):bool]](self:ST, r:int):auto = self.min_left(r, f)\n  proc min_left*[ST:SegTree](self:ST, r:IndexType, f:proc(s:ST.S):bool):int =\n    var r = self^^r\n    assert r in 0..self.len\n    assert f(ST.calc_e())\n    if r == 0: return 0\n    r += self.size\n    var sm = ST.calc_e()\n    while true:\n      r.dec\n      while r > 1 and (r mod 2 != 0): r = r shr 1\n      if not f(ST.calc_op(self.d[r], sm)):\n        while r < self.size:\n          r = (2 * r + 1)\n          if f(ST.calc_op(self.d[r], sm)):\n            sm = ST.calc_op(self.d[r], sm)\n            r.dec\n        return r + 1 - self.size\n      sm = ST.calc_op(self.d[r], sm)\n      if not ((r and -r) != r): break\n    return 0\n  #{.pop.}\n  discard\n"

ImportExpand "cplib/math/combination.nim" <=== "when not declared CPLIB_MATH_COMBINATION:\n    const CPLIB_MATH_COMBINATION* = 1\n    type Combination_Type[ModInt] = ref object\n        fact: seq[ModInt]\n        inv: seq[ModInt]\n        fact_inv: seq[ModInt]\n\n    proc initCombination*[ModInt](max_N: int): Combination_Type[ModInt] =\n        var fact = newSeq[ModInt](max_N+1)\n        var inv = newSeq[ModInt](max_N+1)\n        var fact_inv = newSeq[ModInt](max_N+1)\n        fact[0] = 1\n        fact[1] = 1\n        inv[1] = 1\n        fact_inv[0] = 1\n        fact_inv[1] = 1\n        for i in 2..max_N:\n            fact[i] = fact[i-1] * i\n            inv[i] = -inv[int(ModInt.umod()) mod i]*(int(ModInt.umod()) div i)\n            fact_inv[i] = fact_inv[i-1] * inv[i]\n        result = Combination_Type[ModInt](fact: fact, inv: inv, fact_inv: fact_inv)\n\n    proc ncr*[ModInt](c: Combination_Type[ModInt], n, r: int): ModInt =\n        if n < 0 or r < 0 or n < r:\n            return 0\n        return c.fact[n]*c.fact_inv[n-r]*c.fact_inv[r]\n\n    proc npr*[ModInt](c: Combination_Type[ModInt], n, r: int): ModInt =\n        if n < 0 or r < 0 or n < r:\n            return 0\n        return c.fact[n]*c.fact_inv[n-r]\n\n    proc nhr*[ModInt](c: Combination_Type[ModInt], n, r: int): ModInt =\n        return c.ncr(n+r-1, r)\n    discard\n"

type mint = modint998244353

proc op(x, y: int): int = x+y
proc e(): int = 0

var n = input(int)
var c = initCombination[mint](n*2)

var p = input(int, n).mapIt(it-1)
var pos = newSeq[int](n)
for i in 0..<n: pos[p[i]] = i
var seg = initSegTree[int](n, op, e)
var ans = mint(0)
for i in 0..<n:
    var l = seg.prod(0..<pos[i])
    var li = pos[i] - l
    var r = seg.prod(pos[i]..<n)
    var ri = (n - 1 - pos[i]) - r
    debug(i, l, li, r, ri)
    ans += c.ncr(l+ri, l) * c.ncr(li+r, r)
    debug(ans.val)
    seg[pos[i]] = 1
print(ans.val)
yukicoder

結果

テストケース

ソースコード
