結果

問題 No.140 みんなで旅行
ユーザー 👑 hos.lyric
提出日時 2015-01-29 23:35:15
言語 D
(dmd 2.109.1)
結果
AC  
実行時間 22 ms / 5,000 ms
コード長 2,805 bytes
コンパイル時間 865 ms
コンパイル使用メモリ 124,272 KB
実行使用メモリ 29,568 KB
最終ジャッジ日時 2024-06-12 02:07:12
合計ジャッジ時間 2,243 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
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ファイルパターン 結果
sample AC * 3
other AC * 19
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

import core.thread;
import std.conv, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.container, std.math, std.range, std.regex;
//  Input
class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { tokens = readln.split; if (stdin.eof) throw new EOFException; } auto token = tokens[0]; tokens.popFront; 
    return token; }
int readInt() { return to!int(readToken); }
long readLong() { return to!long(readToken); }
real readReal() { return to!real(readToken); }
//  chmin/chmax
void chmin(T)(ref T t, in T f) { if (t > f) t = f; }
void chmax(T)(ref T t, in T f) { if (t < f) t = f; }
//  Pair
struct Pair(S, T) {
    S x; T y;
    int opCmp(    const Pair p) const { return (x < p.x) ? -1 : (x > p.x) ? +1 : (y < p.y) ? -1 : (y > p.y) ? +1 : 0; }
    int opCmp(ref const Pair p) const { return (x < p.x) ? -1 : (x > p.x) ? +1 : (y < p.y) ? -1 : (y > p.y) ? +1 : 0; }
    string toString() const { return "(" ~ to!string(x) ~ ", " ~ to!string(y) ~ ")"; }
}
auto pair(S, T)(inout(S) x, inout(T) y) { return Pair!(S, T)(x, y); }
//  Array
int binarySearch(T)(in T[] as, in bool delegate(T) test) { int low = -1, upp = as.length; for (; low + 1 < upp; ) { int mid = (low + upp) >> 1; (test
    (as[mid]) ? low : upp) = mid; } return upp; }
int lowerBound(T)(in T[] as, in T val) { return as.binarySearch((T a) { return (a <  val); }); }
int upperBound(T)(in T[] as, in T val) { return as.binarySearch((T a) { return (a <= val); }); }
T[] unique(T)(in T[] as) { T[] bs; foreach (a; as) if (bs.empty || bs[$ - 1] != a) bs ~= a; return bs; }
immutable MO = 10L^^9 + 7;
immutable LIM = 555 * 2 + 5;
long[] inv, fac, facInv;
long[][] bn, S;
int N;
void main(string[] args) {
    inv = new long[LIM];
    inv[1] = 1;
    foreach (i; 2 .. LIM) {
        inv[i] = MO - MO / i * inv[cast(size_t)(MO % i)] % MO;
    }
    fac = new long[LIM];
    facInv = new long[LIM];
    fac[0] = facInv[0] = 1;
    foreach (i; 1 .. LIM) {
        fac[i] = fac[i - 1] * i % MO;
        facInv[i] = facInv[i - 1] * inv[i] % MO;
    }
    
    bn = new long[][](LIM, LIM);
    foreach (n; 0 .. LIM) {
        bn[n][0] = 1;
        bn[n][n] = 1;
        foreach (k; 1 .. n) {
            bn[n][k] = (bn[n - 1][k - 1] + bn[n - 1][k]) % MO;
        }
    }
    S = new long[][](LIM, LIM);
    foreach (n; 0 .. LIM) {
        S[n][0] = 0;
        S[n][n] = 1;
        foreach (k; 1 .. n) {
            S[n][k] = (S[n - 1][k - 1] + k * S[n - 1][k]) % MO;
        }
    }
    
    try {
    for (; ; ) {
        N = readInt;
        
        long ans;
        foreach (k; 1 .. N + 1) {
            long sep = 1;
            foreach_reverse (x; k .. N + 1) {
                long tmp = 1;
                (tmp *= bn[N][x]) %= MO;
                (tmp *= S[x][k]) %= MO;
                (tmp *= sep) %= MO;
debug{
if(N<=3)writeln(k," ",x,"  ",bn[N][x]," ",S[x][k]," ",sep,"  ",tmp);
}
                (ans += tmp) %= MO;
                (sep *= (k * (k - 1))) %= MO;
            }
        }
        writeln(ans);
        
    }
    } catch (EOFException) {}
}
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