結果
| 問題 | No.1094 木登り / Climbing tree |
| ユーザー |
|
| 提出日時 | 2020-06-27 23:14:55 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 475 ms / 2,000 ms |
| コード長 | 3,646 bytes |
| 記録 | |
| コンパイル時間 | 972 ms |
| コンパイル使用メモリ | 121,856 KB |
| 実行使用メモリ | 54,432 KB |
| 最終ジャッジ日時 | 2024-06-22 07:34:00 |
| 合計ジャッジ時間 | 15,956 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 26 |
ソースコード
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) {
}
}