#1017172 (Nim) No.2926 Botaoshi

• 問題: No.2926 Botaoshi
• ユーザー: 👑 seekworser
• 提出日時: 2024-10-12 14:42:35
• 言語: Nim (2.0.2)
• 結果: AC
• 実行時間: 27 ms / 2,000 ms
• コード長: 21,806 bytes
• コンパイル時間: 4,027 ms
• コンパイル使用メモリ: 92,164 KB
• 実行使用メモリ: 5,760 KB
• 最終ジャッジ日時: 2024-10-12 14:42:54
• 合計ジャッジ時間: 6,484 ms
• ジャッジサーバーID （参考情報）: judge / judge5

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	2 ms; 5,248 KB
testcase_02	AC	1 ms; 5,248 KB
testcase_03	AC	1 ms; 5,248 KB
testcase_04	AC	0 ms; 5,248 KB
testcase_05	AC	2 ms; 5,248 KB
testcase_06	AC	1 ms; 5,248 KB
testcase_07	AC	1 ms; 5,248 KB
testcase_08	AC	1 ms; 5,248 KB
testcase_09	AC	2 ms; 5,248 KB
testcase_10	AC	2 ms; 5,248 KB
testcase_11	AC	1 ms; 5,248 KB
testcase_12	AC	24 ms; 5,632 KB
testcase_13	AC	27 ms; 5,376 KB
testcase_14	AC	26 ms; 5,376 KB
testcase_15	AC	2 ms; 5,248 KB
testcase_16	AC	17 ms; 5,248 KB
testcase_17	AC	20 ms; 5,248 KB
testcase_18	AC	5 ms; 5,248 KB
testcase_19	AC	13 ms; 5,248 KB
testcase_20	AC	7 ms; 5,248 KB
testcase_21	AC	12 ms; 5,248 KB
testcase_22	AC	14 ms; 5,248 KB
testcase_23	AC	4 ms; 5,248 KB
testcase_24	AC	17 ms; 5,248 KB
testcase_25	AC	5 ms; 5,248 KB
testcase_26	AC	20 ms; 5,248 KB
testcase_27	AC	12 ms; 5,248 KB
testcase_28	AC	4 ms; 5,248 KB
testcase_29	AC	3 ms; 5,248 KB
testcase_30	AC	7 ms; 5,248 KB
testcase_31	AC	5 ms; 5,248 KB
testcase_32	AC	9 ms; 5,248 KB
testcase_33	AC	18 ms; 5,248 KB
testcase_34	AC	16 ms; 5,248 KB
testcase_35	AC	2 ms; 5,248 KB
testcase_36	AC	27 ms; 5,632 KB
testcase_37	AC	26 ms; 5,760 KB
testcase_38	AC	27 ms; 5,632 KB
testcase_39	AC	26 ms; 5,504 KB
testcase_40	AC	26 ms; 5,632 KB
testcase_41	AC	22 ms; 5,632 KB
testcase_42	AC	22 ms; 5,632 KB
testcase_43	AC	22 ms; 5,760 KB
testcase_44	AC	21 ms; 5,376 KB
testcase_45	AC	21 ms; 5,248 KB

ソースコード

import macros;macro ImportExpand(s:untyped):untyped = parseStmt($s[2])
# source: https://github.com/kemuniku/cplib/tree/main/src/cplib/tmpl/citrus.nim
ImportExpand "cplib/tmpl/citrus" <=== "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    import hashes\n    const MODINT998244353* = 998244353\n    const MODINT1000000007* = 1000000007\n    when not declared CPLIB_UTILS_CONSTANTS:\n        const CPLIB_UTILS_CONSTANTS* = 1\n        const INF32*: int32 = 100100111.int32\n        const INF64*: int = int(3300300300300300491)\n    \n    const INFL = INF64\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 =\n        result = x mod y\n        if y > 0 and result < 0: result += y\n        if y < 0 and result > 0: result += y\n    proc `//`*(x: SomeInteger, y: SomeInteger): int =\n        result = x div y\n        if y > 0 and result * y > x: result -= 1\n        if y < 0 and result * y < x: result -= 1\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 = INF64): 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    when not declared CPLIB_MATH_ISQRT:\n        const CPLIB_MATH_ISQRT* = 1\n        proc isqrt*(n: int): int =\n            var x = n\n            var y = (x + 1) shr 1\n            while y < x:\n                x = y\n                y = (x + n div x) shr 1\n            return x\n    \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    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    proc initHashSet[T](): Hashset[T] = initHashSet[T](0)\n"
# source: https://github.com/zer0-star/Nim-ACL/tree/master/src/atcoder/modint.nim
ImportExpand "atcoder/modint" <=== "when not declared ATCODER_MODINT_HPP:\n  const ATCODER_MODINT_HPP* = 1\n  import std/macros\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  \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  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      #      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  \n\n  proc getBarrett*[T:static[int]](t:typedesc[DynamicModInt[T]]):ptr Barrett =\n    {.cast(noSideEffect).}:\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"

# {.checks: off.}
type mint = modint998244353

var n = input(int)
var s = input(string).mapit("LRU.".find(it))
var dp = newSeqWith(3, mint(0))
dp[2] = 1

for i in 0..<n:
    var dpn = newSeqWith(3, mint(0))
    for j in 0..<3:
        for k in 0..<3:
            if j == 1 and k == 0: continue
            if s[i] != 3 and s[i] != k: continue
            dpn[k] += dp[j]
    swap(dp, dpn)
print(dp.sum.val)