結果

問題 No.2214 Products on Tree
ユーザー 👑 hos.lyrichos.lyric
提出日時 2023-02-10 21:24:21
言語 D
(dmd 2.106.1)
結果
AC  
実行時間 202 ms / 3,000 ms
コード長 3,898 bytes
コンパイル時間 1,684 ms
コンパイル使用メモリ 151,900 KB
実行使用メモリ 43,776 KB
最終ジャッジ日時 2024-06-22 17:27:18
合計ジャッジ時間 8,274 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
このコードへのチャレンジ
（要ログイン）

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 1 ms
6,812 KB
testcase_01 AC 1 ms
6,940 KB
testcase_02 AC 1 ms
6,944 KB
testcase_03 AC 187 ms
12,940 KB
testcase_04 AC 192 ms
15,416 KB
testcase_05 AC 183 ms
14,388 KB
testcase_06 AC 124 ms
9,156 KB
testcase_07 AC 36 ms
6,944 KB
testcase_08 AC 24 ms
6,940 KB
testcase_09 AC 47 ms
6,944 KB
testcase_10 AC 121 ms
8,832 KB
testcase_11 AC 65 ms
6,944 KB
testcase_12 AC 75 ms
6,944 KB
testcase_13 AC 196 ms
15,900 KB
testcase_14 AC 202 ms
16,752 KB
testcase_15 AC 201 ms
13,132 KB
testcase_16 AC 197 ms
16,356 KB
testcase_17 AC 194 ms
14,916 KB
testcase_18 AC 123 ms
12,116 KB
testcase_19 AC 130 ms
12,856 KB
testcase_20 AC 116 ms
10,796 KB
testcase_21 AC 89 ms
8,796 KB
testcase_22 AC 169 ms
14,948 KB
testcase_23 AC 1 ms
6,944 KB
testcase_24 AC 1 ms
6,944 KB
testcase_25 AC 1 ms
6,944 KB
testcase_26 AC 1 ms
6,940 KB
testcase_27 AC 1 ms
6,944 KB
testcase_28 AC 132 ms
32,040 KB
testcase_29 AC 37 ms
6,940 KB
testcase_30 AC 151 ms
15,156 KB
testcase_31 AC 177 ms
16,428 KB
testcase_32 AC 168 ms
15,296 KB
testcase_33 AC 177 ms
43,716 KB
testcase_34 AC 178 ms
43,776 KB
testcase_35 AC 189 ms
28,908 KB
testcase_36 AC 189 ms
30,600 KB
testcase_37 AC 161 ms
13,416 KB
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 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;


int N;
int[] A, B;

int[][] graph;
Mint[2][] dp;

void dfs(int u, int p) {
  Mint f0 = 1, f1 = 1;
  foreach (v; graph[u]) if (p != v) {
    dfs(v, u);
    Mint g0, g1;
    
    // cut
    g0 += f0 * dp[v][1];
    g1 += f1 * dp[v][1];
    // conn
    g0 += f0 * dp[v][0];
    g1 += f0 * dp[v][1];
    g1 += f1 * dp[v][0];
    
    f0 = g0;
    f1 = g1;
  }
  dp[u][0] = f0;
  dp[u][1] = f1;
}

void main() {
  try {
    for (; ; ) {
      N = readInt;
      A = new int[N - 1];
      B = new int[N - 1];
      foreach (i; 0 .. N - 1) {
        A[i] = readInt - 1;
        B[i] = readInt - 1;
      }
      
      graph = new int[][N];
      foreach (i; 0 .. N - 1) {
        graph[A[i]] ~= B[i];
        graph[B[i]] ~= A[i];
      }
      dp = new Mint[2][N];
      dfs(0, -1);
      writeln(dp[0][1]);
    }
  } catch (EOFException e) {
  }
}
0