結果
問題 | No.243 出席番号(2) |
ユーザー |
👑 |
提出日時 | 2019-04-26 20:08:45 |
言語 | D (dmd 2.109.1) |
結果 |
AC
|
実行時間 | 267 ms / 2,000 ms |
コード長 | 2,624 bytes |
コンパイル時間 | 723 ms |
コンパイル使用メモリ | 120,496 KB |
実行使用メモリ | 9,948 KB |
最終ジャッジ日時 | 2024-06-22 00:56:19 |
合計ジャッジ時間 | 4,618 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 30 |
ソースコード
import std.conv, std.functional, std.stdio, std.string;import std.algorithm, std.array, std.bigint, std.complex, std.container, std.math, std.numeric, std.range, 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 MO = 10L^^9 + 7;enum LIM = 10^^5;long[] inv, fac, invFac;void prepare() {inv = new long[LIM];fac = new long[LIM];invFac = new long[LIM];inv[1] = 1;foreach (i; 2 .. LIM) {inv[i] = MO - ((MO / i) * inv[cast(size_t)(MO % i)]) % MO;}fac[0] = invFac[0] = 1;foreach (i; 1 .. LIM) {fac[i] = (fac[i - 1] * i) % MO;invFac[i] = (invFac[i - 1] * inv[i]) % MO;}}long binom(long n, long k) {if (0 <= k && k <= n) {assert(n < LIM);return fac[cast(size_t)(n)] * invFac[cast(size_t)(k)] % MO * invFac[cast(size_t)(n - k)] % MO;} else {return 0;}}int N;int[] A;void main() {prepare();try {for (; ; ) {N = readInt();A = new int[N];foreach (i; 0 .. N) {A[i] = readInt();}auto cnt = new int[N];foreach (i; 0 .. N) {if (0 <= A[i] && A[i] < N) {++cnt[A[i]];}}auto dp = new long[N + 1];dp[0] = 1;foreach (j; 0 .. N) {auto dpNext = new long[N + 1];foreach (x; 0 .. N + 1) {(dpNext[x] += dp[x]) %= MO;if (x + 1 <= N) {(dpNext[x + 1] += dp[x] * cnt[j]) %= MO;}}dp = dpNext;}long ans;foreach (x; 0 .. N + 1) {ans += ((x % 2 != 0) ? -1 : +1) * dp[x] * fac[N - x];ans %= MO;}ans = (ans % MO + MO) % MO;writeln(ans);}} catch (EOFException e) {}}