結果
| 問題 |
No.848 なかよし旅行
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-05-21 21:13:38 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 284 ms / 2,000 ms |
| コード長 | 2,950 bytes |
| コンパイル時間 | 1,144 ms |
| コンパイル使用メモリ | 138,720 KB |
| 実行使用メモリ | 15,140 KB |
| 最終ジャッジ日時 | 2024-06-22 11:18:29 |
| 合計ジャッジ時間 | 3,992 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| 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.complex, std.container, std.math, 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)); }
enum INF = 10L^^18;
int N, M, P, Q;
long T;
int[] A, B;
long[] C;
void main() {
try {
for (; ; ) {
N = readInt();
M = readInt();
P = readInt() - 1;
Q = readInt() - 1;
T = readLong();
A = new int[M];
B = new int[M];
C = new long[M];
foreach (i; 0 .. M) {
A[i] = readInt() - 1;
B[i] = readInt() - 1;
C[i] = readLong();
}
auto graph = new int[][N];
foreach (i; 0 .. M) {
graph[A[i]] ~= i;
graph[B[i]] ~= i;
}
const srcs = [0, P, Q];
auto dist = new long[][](3, N);
foreach (h; 0 .. 3) {
alias Node = Tuple!(long, "c", int, "u");
BinaryHeap!(Array!Node, "a > b") q;
dist[h][] = INF;
dist[h][srcs[h]] = 0;
q.insert(Node(0, srcs[h]));
for (; !q.empty; ) {
const c = q.front.c;
const u = q.front.u;
q.removeFront;
if (dist[h][u] == c) {
foreach (i; graph[u]) {
const cc = c + C[i];
const v = A[i] ^ B[i] ^ u;
if (dist[h][v] > cc) {
dist[h][v] = cc;
q.insert(Node(cc, v));
}
}
}
}
}
debug {
foreach (h; 0 .. 3) {
writeln(dist[h]);
}
}
long ans = -1;
if (dist[0][P] + dist[1][Q] + dist[2][0] <= T) {
chmax(ans, T);
}
foreach (u; 0 .. N) foreach (v; 0 .. N) {
if (dist[0][u] + dist[1][u] + dist[1][v] + dist[0][v] <= T &&
dist[0][u] + dist[2][u] + dist[2][v] + dist[0][v] <= T) {
chmax(ans, T - max(dist[1][u] + dist[1][v], dist[2][u] + dist[2][v]));
}
}
writeln(ans);
}
} catch (EOFException e) {
}
}