結果
| 問題 |
No.3291 K-step Navigation
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2025-10-03 22:06:12 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 2,643 bytes |
| コンパイル時間 | 667 ms |
| コンパイル使用メモリ | 108,040 KB |
| 実行使用メモリ | 7,720 KB |
| 最終ジャッジ日時 | 2025-10-03 22:06:24 |
| 合計ジャッジ時間 | 9,773 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 28 WA * 22 |
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; }
string COLOR(string s = "") { return "\x1b[" ~ s ~ "m"; }
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)); }
void main() {
try {
for (; ; ) {
const N = readInt;
const M = readInt;
const K = readLong;
const S = readInt - 1;
const T = readInt - 1;
auto A = new int[M];
auto B = new int[M];
foreach (i; 0 .. M) {
A[i] = readInt - 1;
B[i] = readInt - 1;
}
auto graph = new int[][N];
foreach (i; 0 .. M) {
graph[A[i]] ~= B[i];
graph[B[i]] ~= A[i];
}
// min odd cycle
int odd = -1;
foreach (r; 0 .. N) {
DList!int que;
auto dist = new int[N << 1];
dist[] = -1;
dist[r << 1] = 0;
que.insertBack(r << 1);
for (; !que.empty; ) {
const u = que.front >> 1;
const s = que.front & 1;
que.removeFront;
foreach (v; graph[u]) {
const t = s ^ 1;
if (!~dist[v << 1 | t]) {
dist[v << 1 | t] = dist[u << 1 | s] + 1;
que.insertBack(v << 1 | t);
}
}
}
const d = dist[r << 1 | 1];
if (~d) {
if (!~odd || odd > d) odd = d;
}
}
debug writeln("odd = ", odd);
bool ans;
if (K & 1) {
ans = true;
} else {
ans = ans || graph[S].length;
ans = ans || graph[T].length;
ans = ans || (3 + odd <= K);
}
writeln(ans ? "Yes" : "No");
}
} catch (EOFException e) {
}
}