結果

問題 No.1094 木登り / Climbing tree
ユーザー 👑 hos.lyrichos.lyric
提出日時 2020-06-27 23:14:55
言語 D
(dmd 2.106.1)
結果
AC  
実行時間 645 ms / 2,000 ms
コード長 3,646 bytes
コンパイル時間 1,522 ms
コンパイル使用メモリ 107,440 KB
実行使用メモリ 51,644 KB
最終ジャッジ日時 2023-09-04 08:21:54
合計ジャッジ時間 22,195 ms
ジャッジサーバーID
(参考情報)
judge14 / judge15
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 1 ms
4,376 KB
testcase_01 AC 645 ms
32,240 KB
testcase_02 AC 238 ms
51,644 KB
testcase_03 AC 122 ms
5,552 KB
testcase_04 AC 183 ms
20,892 KB
testcase_05 AC 339 ms
27,752 KB
testcase_06 AC 297 ms
19,320 KB
testcase_07 AC 628 ms
37,324 KB
testcase_08 AC 625 ms
32,500 KB
testcase_09 AC 635 ms
37,328 KB
testcase_10 AC 624 ms
37,324 KB
testcase_11 AC 627 ms
33,220 KB
testcase_12 AC 629 ms
38,092 KB
testcase_13 AC 636 ms
32,440 KB
testcase_14 AC 620 ms
33,344 KB
testcase_15 AC 271 ms
23,912 KB
testcase_16 AC 427 ms
49,636 KB
testcase_17 AC 334 ms
33,748 KB
testcase_18 AC 303 ms
29,344 KB
testcase_19 AC 385 ms
40,320 KB
testcase_20 AC 638 ms
33,156 KB
testcase_21 AC 339 ms
34,084 KB
testcase_22 AC 635 ms
37,332 KB
testcase_23 AC 623 ms
31,592 KB
testcase_24 AC 621 ms
33,824 KB
testcase_25 AC 618 ms
33,108 KB
testcase_26 AC 610 ms
32,688 KB
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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)); }


class SegmentTree(T, alias op) {
  import std.functional : binaryFun;
  alias opFun = binaryFun!op;
  const(T) idT;

  int n;
  T[] ts;
  this(int n_, const(T) idT) {
    this.idT = idT;
    for (n = 1; n < n_; n <<= 1) {}
    ts = new T[n << 1];
    ts[] = idT;
  }
  this(inout(T)[] ts_, const(T) idT) {
    this.idT = idT;
    const n_ = cast(int)(ts_.length);
    for (n = 1; n < n_; n <<= 1) {}
    ts = new T[n << 1];
    ts[0 .. n] = idT;
    ts[n .. n + n_] = ts_[];
    ts[n + n_ .. n << 1] = idT;
    build();
  }
  ref T at(int a) {
    return ts[n + a];
  }
  void build() {
    foreach_reverse (a; 1 .. n) ts[a] = opFun(ts[a << 1], ts[a << 1 | 1]);
  }
  void set(int a, const(T) val) {
    ts[a += n] = val;
    for (; a >>= 1; ) ts[a] = opFun(ts[a << 1], ts[a << 1 | 1]);
  }
  void mulL(int a, const(T) val) {
    set(a, opFun(val, ts[a + n]));
  }
  void mulR(int a, const(T) val) {
    set(a, opFun(ts[a + n], val));
  }
  T query(int a, int b) const {
    T prodL = idT, prodR = idT;
    for (a += n, b += n; a < b; a >>= 1, b >>= 1) {
      if (a & 1) prodL = opFun(prodL, ts[a++]);
      if (b & 1) prodR = opFun(ts[--b], prodR);
    }
    return opFun(prodL, prodR);
  }
}


enum INF = 10L^^18;

int N;
int[] A, B;
long[] C;

int[][] G;

int[] poss;
long[] ds;

void dfs(int u, int p, long d) {
  poss[u] = cast(int)(ds.length);
  ds ~= d;
  foreach (i; G[u]) {
    const v = A[i] ^ B[i] ^ u;
    if (v != p) {
      dfs(v, u, d + C[i]);
      ds ~= d;
    }
  }
}

void main() {
  try {
    for (; ; ) {
      N = readInt();
      A = new int[N - 1];
      B = new int[N - 1];
      C = new long[N - 1];
      foreach (i; 0 .. N - 1) {
        A[i] = readInt() - 1;
        B[i] = readInt() - 1;
        C[i] = readLong();
      }
      const Q = readInt();
      auto S = new int[Q];
      auto T = new int[Q];
      foreach (q; 0 .. Q) {
        S[q] = readInt() - 1;
        T[q] = readInt() - 1;
      }
      
      G = new int[][N];
      foreach (i; 0 .. N - 1) {
        G[A[i]] ~= i;
        G[B[i]] ~= i;
      }
      
      poss = new int[N];
      ds = [];
      dfs(0, -1, 0);
      
      auto seg = new SegmentTree!(long, min)(ds, INF);
      foreach (q; 0 .. Q) {
        int a = poss[S[q]], b = poss[T[q]];
        if (a > b) {
          swap(a, b);
        }
        long ans;
        ans += ds[a];
        ans += ds[b];
        ans -= 2 * seg.query(a, b + 1);
        writeln(ans);
      }
    }
  } catch (EOFException e) {
  }
}
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