結果
| 問題 |
No.2286 Join Hands
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-04-28 23:01:44 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
RE
|
| 実行時間 | - |
| コード長 | 3,309 bytes |
| コンパイル時間 | 696 ms |
| コンパイル使用メモリ | 117,972 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-06-22 17:48:34 |
| 合計ジャッジ時間 | 4,758 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 RE * 1 |
| other | AC * 44 RE * 14 |
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; }
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 MaxFlow(Capa, Capa CAPA_EPS = 0, Capa CAPA_INF = 10^^9) {
int n, m;
int[][] g;
int[] zu;
Capa[] capa;
Capa tof;
int[] lev, see, que;
this(int n) {
this.n = n; m = 0; g = new int[][n]; zu = []; capa = [];
lev = new int[n]; see = new int[n]; que = new int[n];
}
void ae(int u, int v, Capa w0, Capa w1 = 0) {
g[u] ~= m; zu ~= v; capa ~= w0; ++m;
g[v] ~= m; zu ~= u; capa ~= w1; ++m;
}
Capa augment(int src, int ink, Capa flo) {
if (src == ink) return flo;
foreach (i; g[src][see[src] .. $]) {
if (capa[i] > CAPA_EPS && lev[src] < lev[zu[i]]) {
Capa f = augment(zu[i], ink, min(flo, capa[i]));
if (f > CAPA_EPS) { capa[i] -= f; capa[i ^ 1] += f; return f; }
}
++see[src];
}
return 0;
}
bool dinic(int src, int ink, Capa flo = CAPA_INF) {
for (tof = 0; tof + CAPA_EPS < flo; ) {
int qb, qe;
lev[] = -1;
dinicBFS:
for (lev[src] = 0, que[qe++] = src; qb != qe; ) {
const u = que[qb++];
foreach (i; g[u]) {
const v = zu[i];
if (capa[i] > CAPA_EPS && lev[v] == -1) {
lev[v] = lev[u] + 1; que[qe++] = v;
if (v == ink) break dinicBFS;
}
}
}
if (lev[ink] == -1) return false;
see[] = 0;
for (; ; ) {
Capa f = augment(src, ink, flo - tof);
if (f <= CAPA_EPS) break;
tof += f;
}
}
return true;
}
}
void main() {
try {
for (; ; ) {
const N = readInt;
const M = readInt;
auto A = new int[M];
auto B = new int[M];
foreach (i; 0 .. M) {
A[i] = readInt - 1;
B[i] = readInt - 1;
}
auto mf = new MaxFlow!int(2 + N + N);
foreach (u; 0 .. N) {
mf.ae(0, 2 + u, 1);
mf.ae(2 + N + u, 1, 1);
}
foreach (i; 0 .. M) {
mf.ae(2 + A[i], 2 + N + B[i], 1);
mf.ae(2 + B[i], 2 + N + A[i], 1);
}
mf.dinic(0, 1);
const ans = mf.tof;
debug {
writeln("ans = ", ans);
}
writeln(2 * ans - N);
if (ans == N - 1) {
assert(false);
}
}
} catch (EOFException e) {
}
}