結果

問題 No.1207 グラフX
ユーザー 👑 hos.lyrichos.lyric
提出日時 2020-08-30 14:18:50
言語 D
(dmd 2.107.1)
結果
AC  
実行時間 421 ms / 2,000 ms
コード長 4,148 bytes
コンパイル時間 7,203 ms
コンパイル使用メモリ 159,140 KB
実行使用メモリ 56,652 KB
最終ジャッジ日時 2023-09-04 09:40:06
合計ジャッジ時間 22,118 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（β）

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 323 ms
24,708 KB
testcase_01 AC 321 ms
24,732 KB
testcase_02 AC 317 ms
24,152 KB
testcase_03 AC 316 ms
25,216 KB
testcase_04 AC 316 ms
23,812 KB
testcase_05 AC 417 ms
56,652 KB
testcase_06 AC 417 ms
56,232 KB
testcase_07 AC 420 ms
54,824 KB
testcase_08 AC 273 ms
19,772 KB
testcase_09 AC 278 ms
24,128 KB
testcase_10 AC 410 ms
44,364 KB
testcase_11 AC 421 ms
53,748 KB
testcase_12 AC 257 ms
23,068 KB
testcase_13 AC 167 ms
14,644 KB
testcase_14 AC 308 ms
24,988 KB
testcase_15 AC 282 ms
24,140 KB
testcase_16 AC 154 ms
14,936 KB
testcase_17 AC 217 ms
19,488 KB
testcase_18 AC 177 ms
22,096 KB
testcase_19 AC 229 ms
18,056 KB
testcase_20 AC 314 ms
24,940 KB
testcase_21 AC 30 ms
4,376 KB
testcase_22 AC 215 ms
20,232 KB
testcase_23 AC 235 ms
21,336 KB
testcase_24 AC 155 ms
20,276 KB
testcase_25 AC 315 ms
24,992 KB
testcase_26 AC 248 ms
21,280 KB
testcase_27 AC 295 ms
23,284 KB
testcase_28 AC 281 ms
22,584 KB
testcase_29 AC 278 ms
24,464 KB
testcase_30 AC 153 ms
15,416 KB
testcase_31 AC 142 ms
14,168 KB
testcase_32 AC 125 ms
15,688 KB
testcase_33 AC 134 ms
15,688 KB
testcase_34 AC 268 ms
22,308 KB
testcase_35 AC 31 ms
4,376 KB
testcase_36 AC 262 ms
23,920 KB
testcase_37 AC 239 ms
20,320 KB
testcase_38 AC 66 ms
8,220 KB
testcase_39 AC 143 ms
17,060 KB
testcase_40 AC 118 ms
14,144 KB
testcase_41 AC 206 ms
16,220 KB
testcase_42 AC 2 ms
4,376 KB
testcase_43 AC 2 ms
4,380 KB
testcase_44 AC 2 ms
4,380 KB
testcase_45 AC 301 ms
21,784 KB
testcase_46 AC 296 ms
20,368 KB
testcase_47 AC 292 ms
21,816 KB
testcase_48 AC 296 ms
22,036 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; }
real readReal() { return readToken.to!real; }

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(int M_) {
  import std.conv : to;
  alias M = M_;
  int x;
  this(ModInt a) { x = a.x; }
  this(long a) { x = cast(int)(a % M); if (x < 0) x += M; }
  ref ModInt opAssign(long a) { return (this = ModInt(a)); }
  ref ModInt opOpAssign(string op)(ModInt a) {
    static if (op == "+") { x += a.x; if (x >= M) x -= M; }
    else static if (op == "-") { x -= a.x; if (x < 0) x += M; }
    else static if (op == "*") { x = cast(int)((cast(long)(x) * a.x) % M); }
    else static if (op == "/") { this *= a.inv(); }
    else static assert(false);
    return this;
  }
  ref ModInt opOpAssign(string op)(long a) {
    static if (op == "^^") {
      if (a < 0) return (this = inv()^^(-a));
      ModInt t2 = this, te = ModInt(1);
      for (long e = a; e > 0; e >>= 1) {
        if (e & 1) te *= t2;
        t2 *= t2;
      }
      x = cast(int)(te.x);
      return this;
    } else return mixin("this " ~ op ~ "= ModInt(a)");
  }
  ModInt inv() const {
    int a = x, b = M, y = 1, z = 0, t;
    for (; ; ) {
      t = a / b; a -= t * b;
      if (a == 0) {
        assert(b == 1 || b == -1);
        return ModInt(b * z);
      }
      y -= t * z;
      t = b / a; b -= t * a;
      if (b == 0) {
        assert(a == 1 || a == -1);
        return ModInt(a * y);
      }
      z -= t * y;
    }
  }
  ModInt opUnary(string op: "-")() const { return ModInt(-x); }
  ModInt opBinary(string op, T)(T a) const {
    return mixin("ModInt(this) " ~ op ~ "= a");
  }
  ModInt opBinaryRight(string op)(long a) const {
    return mixin("ModInt(a) " ~ op ~ "= this");
  }
  bool opCast(T: bool)() const { return (x != 0); }
  string toString() const { return x.to!string; }
}


enum MO = 10^^9 + 7;
alias Mint = ModInt!MO;


int root(int[] uf, int u) {
  return (uf[u] < 0) ? u : (uf[u] = uf.root(uf[u]));
}
bool connect(int[] uf, int u, int v) {
  u = uf.root(u);
  v = uf.root(v);
  if (u == v) return false;
  if (uf[u] > uf[v]) swap(u, v);
  uf[u] += uf[v];
  uf[v] = u;
  return true;
}


alias Edge = Tuple!(long, "c", int, "v");

int N;
long X;
Edge[][] graph;
Mint ans;

int dfs(int u, int p) {
  int sz = 1;
  foreach (ref e; graph[u]) {
    const v = e.v;
    if (v != p) {
      const res = dfs(v, u);
      sz += res;
      ans += Mint(N - res) * Mint(res) * Mint(X)^^(e.c);
    }
  }
  return sz;
}

void main() {
  try {
    for (; ; ) {
      N = readInt();
      const M = readInt();
      X = readLong();
      auto A = new int[M];
      auto B = new int[M];
      auto C = new long[M];
      foreach (i; 0 .. M) {
        A[i] = readInt() - 1;
        B[i] = readInt() - 1;
        C[i] = readLong();
      }
      
      auto uf = new int[N];
      uf[] = -1;
      graph = new Edge[][N];
      foreach (i; 0 .. M) {
        if (uf.connect(A[i], B[i])) {
          graph[A[i]] ~= Edge(C[i], B[i]);
          graph[B[i]] ~= Edge(C[i], A[i]);
        }
      }
      
      ans = 0;
      dfs(0, -1);
      writeln(ans);
    }
  } catch (EOFException e) {
  }
}
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