#879618 (D) No.2345 max(l,r)

提出ソース

結果

問題	No.2345 max(l,r)
ユーザー	👑 hos.lyric
提出日時	2023-06-10 03:49:06
言語	D (dmd 2.106.1)
結果	WA
実行時間	-
コード長	5,685 bytes
コンパイル時間	1,505 ms
コンパイル使用メモリ	156,616 KB
実行使用メモリ	25,144 KB
最終ジャッジ日時	2024-06-22 18:05:37
合計ジャッジ時間	8,535 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
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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	11 ms 7,452 KB
testcase_01	WA	-
testcase_02	AC	77 ms 14,624 KB
testcase_03	AC	74 ms 14,620 KB
testcase_04	AC	79 ms 14,700 KB
testcase_05	AC	78 ms 14,592 KB
testcase_06	AC	78 ms 14,616 KB
testcase_07	AC	78 ms 15,276 KB
testcase_08	AC	74 ms 14,552 KB
testcase_09	AC	73 ms 14,664 KB
testcase_10	AC	75 ms 14,624 KB
testcase_11	AC	72 ms 15,240 KB
testcase_12	AC	72 ms 15,200 KB
testcase_13	WA	-
testcase_14	WA	-
testcase_15	WA	-
testcase_16	WA	-
testcase_17	WA	-
testcase_18	WA	-
testcase_19	WA	-
testcase_20	WA	-
testcase_21	WA	-
testcase_22	AC	54 ms 15,652 KB
testcase_23	AC	55 ms 15,116 KB
testcase_24	AC	24 ms 11,132 KB
testcase_25	AC	36 ms 11,216 KB
testcase_26	AC	36 ms 14,440 KB
testcase_27	AC	34 ms 10,788 KB
testcase_28	AC	20 ms 11,856 KB
testcase_29	AC	28 ms 12,568 KB
testcase_30	AC	17 ms 9,108 KB
testcase_31	AC	39 ms 14,136 KB
testcase_32	AC	24 ms 11,348 KB
testcase_33	AC	27 ms 11,680 KB
testcase_34	AC	12 ms 7,620 KB
testcase_35	AC	15 ms 11,000 KB
testcase_36	AC	19 ms 10,052 KB
testcase_37	AC	23 ms 11,476 KB
testcase_38	AC	42 ms 13,720 KB
testcase_39	AC	61 ms 14,076 KB
testcase_40	AC	56 ms 13,920 KB
testcase_41	AC	46 ms 13,208 KB
testcase_42	AC	56 ms 13,204 KB
testcase_43	AC	48 ms 14,052 KB
testcase_44	AC	64 ms 13,872 KB
testcase_45	AC	66 ms 15,832 KB
testcase_46	AC	65 ms 14,988 KB
testcase_47	AC	53 ms 13,364 KB
testcase_48	WA	-
testcase_49	WA	-
testcase_50	WA	-
testcase_51	WA	-
testcase_52	WA	-
testcase_53	WA	-
testcase_54	WA	-
testcase_55	WA	-
testcase_56	WA	-
testcase_57	WA	-
testcase_58	WA	-
testcase_59	WA	-
testcase_60	WA	-
testcase_61	WA	-
testcase_62	WA	-
testcase_63	WA	-
testcase_64	WA	-
testcase_65	WA	-
testcase_66	WA	-
testcase_67	WA	-
testcase_68	AC	371 ms 25,144 KB

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ソースコード

raw source code

import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }

struct ModInt(uint M_) {
  import std.conv : to;
  alias M = M_;
  uint x;
  this(ModInt a) { x = a.x; }
  this(uint x_) { x = x_ % M; }
  this(ulong x_) { x = cast(uint)(x_ % M); }
  this(int x_) { x = ((x_ %= cast(int)(M)) < 0) ? (x_ + cast(int)(M)) : x_; }
  this(long x_) { x = cast(uint)(((x_ %= cast(long)(M)) < 0) ? (x_ + cast(long)(M)) : x_); }
  ref ModInt opAssign(T)(inout(T) a) if (is(T == uint) || is(T == ulong) || is(T == int) || is(T == long)) { return this = ModInt(a); }
  ref ModInt opOpAssign(string op, T)(T a) {
    static if (is(T == ModInt)) {
      static if (op == "+") { x = ((x += a.x) >= M) ? (x - M) : x; }
      else static if (op == "-") { x = ((x -= a.x) >= M) ? (x + M) : x; }
      else static if (op == "*") { x = cast(uint)((cast(ulong)(x) * a.x) % M); }
      else static if (op == "/") { this *= a.inv(); }
      else static assert(false);
      return this;
    } else static if (op == "^^") {
      if (a < 0) return this = inv()^^(-a);
      ModInt b = this, c = 1U;
      for (long e = a; e; e >>= 1) { if (e & 1) c *= b; b *= b; }
      return this = c;
    } else {
      return mixin("this " ~ op ~ "= ModInt(a)");
    }
  }
  ModInt inv() const {
    uint a = M, b = x; int y = 0, z = 1;
    for (; b; ) { const q = a / b; const c = a - q * b; a = b; b = c; const w = y - cast(int)(q) * z; y = z; z = w; }
    assert(a == 1); return ModInt(y);
  }
  ModInt opUnary(string op)() const {
    static if (op == "+") { return this; }
    else static if (op == "-") { ModInt a; a.x = x ? (M - x) : 0U; return a; }
    else static assert(false);
  }
  ModInt opBinary(string op, T)(T a) const { return mixin("ModInt(this) " ~ op ~ "= a"); }
  ModInt opBinaryRight(string op, T)(T a) const { return mixin("ModInt(a) " ~ op ~ "= this"); }
  bool opCast(T: bool)() const { return (x != 0U); }
  string toString() const { return x.to!string; }
}

enum MO = 998244353;
alias Mint = ModInt!MO;

enum LIM_INV = 4 * 10^^5 + 10;
Mint[] inv, fac, invFac;
void prepare() {
  inv = new Mint[LIM_INV];
  fac = new Mint[LIM_INV];
  invFac = new Mint[LIM_INV];
  inv[1] = 1;
  foreach (i; 2 .. LIM_INV) {
    inv[i] = -((Mint.M / i) * inv[cast(size_t)(Mint.M % i)]);
  }
  fac[0] = invFac[0] = 1;
  foreach (i; 1 .. LIM_INV) {
    fac[i] = fac[i - 1] * i;
    invFac[i] = invFac[i - 1] * inv[i];
  }
}
Mint binom(long n, long k) {
  if (n < 0) {
    if (k >= 0) {
      return (-1)^^(k & 1) * binom(-n + k - 1, k);
    } else if (n - k >= 0) {
      return (-1)^^((n - k) & 1) * binom(-k - 1, n - k);
    } else {
      return Mint(0);
    }
  } else {
    if (0 <= k && k <= n) {
      assert(n < LIM_INV);
      return fac[cast(size_t)(n)] * invFac[cast(size_t)(k)] * invFac[cast(size_t)(n - k)];
    } else {
      return Mint(0);
    }
  }
}


int N, M;
int[] A;

Mint solve() {
  int L;
  int[] B, C;
  for (int i = 0, j; i < N; i = j) {
    for (j = i; j < N && A[i] == A[j]; ++j) {}
    B ~= A[i];
    C ~= (j - i);
  }
  const K = cast(int)(B.length);
  debug {
    writefln("B = %s, C = %s", B, C);
  }
  
  Mint ans = 1;
  int sumL, sumR;
  auto ls = new int[K];
  auto rs = new int[K];
  foreach_reverse (k; 1 .. K) {
    const l = N - sumL - B[k];
    const r = N - sumR - B[k];
    if (l > 0 && r > 0 && C[k] == l && C[k] == r) {
      ans *= 2;
      ls[k] = l;
    } else if (l > 0 && r > 0 && C[k] == l + r) {
      ls[k] = l;
      rs[k] = r;
    } else if (l > 0 && C[k] == l) {
      ls[k] = l;
    } else if (r > 0 && C[k] == r) {
      rs[k] = r;
    } else {
      return Mint(0);
    }
    sumL += ls[k];
    sumR += rs[k];
  }
  debug {
    writefln("ls = %s, rs = %s", ls, rs);
  }
  
  {
    int l;
    foreach_reverse (k; 1 .. K) if (ls[k]) {
      if (max(l, N - ls[k] - l) != B[k]) {
        return Mint(0);
      }
      l += ls[k];
    }
  }
  {
    int r;
    foreach_reverse (k; 1 .. K) if (rs[k]) {
      if (max(r, N - rs[k] - r) != B[k]) {
        return Mint(0);
      }
      r += rs[k];
    }
  }
  if (max(sumL, sumR) != B[0]) {
    return Mint(0);
  }
  
  int cnt = 1;
  foreach (k; 1 .. K) {
    if (ls[k]) ++cnt;
    if (rs[k]) ++cnt;
    ans *= binom(C[k], ls[k]);
  }
  ans *= binom(M, cnt);
  return ans;
}

void main() {
  prepare;
  
  try {
    for (; ; ) {
      const numCases = readInt;
      foreach (caseId; 0 .. numCases) {
        N = readInt;
        M = readInt;
        A = new int[N];
        foreach (i; 0 .. N) {
          A[i] = readInt;
        }
        A.sort;
        
        const ans = solve;
        writeln(ans);
      }
    }
  } catch (EOFException e) {
  }
}

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結果

テストケース

ソースコード