結果

問題 No.243 出席番号(2)
ユーザー tanzakutanzaku
提出日時 2015-07-11 10:27:07
言語 Java21
(openjdk 21)
結果
AC  
実行時間 147 ms / 2,000 ms
コード長 5,722 bytes
コンパイル時間 2,047 ms
コンパイル使用メモリ 80,236 KB
実行使用メモリ 51,812 KB
最終ジャッジ日時 2024-07-08 02:51:18
合計ジャッジ時間 5,812 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge4
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 47 ms
50,200 KB
testcase_01 AC 48 ms
50,576 KB
testcase_02 AC 46 ms
50,380 KB
testcase_03 AC 71 ms
51,324 KB
testcase_04 AC 74 ms
51,428 KB
testcase_05 AC 71 ms
51,300 KB
testcase_06 AC 71 ms
51,368 KB
testcase_07 AC 68 ms
51,356 KB
testcase_08 AC 77 ms
51,308 KB
testcase_09 AC 77 ms
51,352 KB
testcase_10 AC 78 ms
51,264 KB
testcase_11 AC 80 ms
51,316 KB
testcase_12 AC 76 ms
51,812 KB
testcase_13 AC 89 ms
51,352 KB
testcase_14 AC 98 ms
51,576 KB
testcase_15 AC 95 ms
51,728 KB
testcase_16 AC 90 ms
51,420 KB
testcase_17 AC 88 ms
51,500 KB
testcase_18 AC 118 ms
51,736 KB
testcase_19 AC 115 ms
51,528 KB
testcase_20 AC 117 ms
51,700 KB
testcase_21 AC 114 ms
51,660 KB
testcase_22 AC 113 ms
51,460 KB
testcase_23 AC 139 ms
51,432 KB
testcase_24 AC 137 ms
51,656 KB
testcase_25 AC 146 ms
51,588 KB
testcase_26 AC 141 ms
51,656 KB
testcase_27 AC 147 ms
51,528 KB
testcase_28 AC 50 ms
50,032 KB
testcase_29 AC 49 ms
50,052 KB
testcase_30 AC 48 ms
50,324 KB
testcase_31 AC 47 ms
50,192 KB
testcase_32 AC 51 ms
50,328 KB
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 # 


import java.io.*;
import java.math.*;
import java.util.*;

import static java.util.Arrays.*;

public class Main {
	private static final int mod = (int)1e9+7;

	final Random random = new Random(0);
	final IOFast io = new IOFast();

	/// MAIN CODE
	public void run() throws IOException {
//		int TEST_CASE = Integer.parseInt(new String(io.nextLine()).trim());
		int TEST_CASE = 1;
		while(TEST_CASE-- != 0) {
			int n = io.nextInt();
			int[] cnt = new int[5000];
			
			for(int v : io.nextIntArray(n)) {
				cnt[v]++;
			}
			
			long[] fact = new long[n+1];
			fact[0] = 1;
			for(int i = 1; i < fact.length; i++) {
				fact[i] = fact[i-1] * i % mod;
			}
			
			long[] dp = new long[n+1];
			dp[0] = 1;
			for(int i = 0; i < n; i++) {
				for(int j = n - 1; j >= 0; j--) {
					dp[j+1] = (dp[j+1] + dp[j] * cnt[i]) % mod;
				}
			}
			
			long ans = 0;
			for(int i = 0; i <= n; i++) {
				ans += (i%2==0?1:-1) * dp[i] * fact[n-i] % mod;
			}
			io.out.println((ans % mod + mod) % mod);
		}
	}
	
	/// TEMPLATE
	static int gcd(int n, int r) { return r == 0 ? n : gcd(r, n%r); }
	static long gcd(long n, long r) { return r == 0 ? n : gcd(r, n%r); }
	
	static <T> void swap(T[] x, int i, int j) { T t = x[i]; x[i] = x[j]; x[j] = t; }
	static void swap(int[] x, int i, int j) { int t = x[i]; x[i] = x[j]; x[j] = t; }
	
	void main() throws IOException {
		//		IOFast.setFileIO("rle-size.in", "rle-size.out");
		try { run(); }
		catch (EndOfFileRuntimeException e) { }
		io.out.flush();
	}
	public static void main(String[] args) throws IOException { new Main().main(); }
	
	static class EndOfFileRuntimeException extends RuntimeException {
		private static final long serialVersionUID = -8565341110209207657L; }

	static
	public class IOFast {
		private BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		private PrintWriter out = new PrintWriter(System.out);

		void setFileIn(String ins) throws IOException { in.close(); in = new BufferedReader(new FileReader(ins)); }
		void setFileOut(String outs) throws IOException { out.flush(); out.close(); out = new PrintWriter(new FileWriter(outs)); }
		void setFileIO(String ins, String outs) throws IOException { setFileIn(ins); setFileOut(outs); }

		private static int pos, readLen;
		private static final char[] buffer = new char[1024 * 8];
		private static char[] str = new char[500*8*2];
		private static boolean[] isDigit = new boolean[256];
		private static boolean[] isSpace = new boolean[256];
		private static boolean[] isLineSep = new boolean[256];

		static { for(int i = 0; i < 10; i++) { isDigit['0' + i] = true; } isDigit['-'] = true; isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true; isLineSep['\r'] = isLineSep['\n'] = true; }
		public int read() throws IOException { if(pos >= readLen) { pos = 0; readLen = in.read(buffer); if(readLen <= 0) { throw new EndOfFileRuntimeException(); } } return buffer[pos++]; }
		public int nextInt() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; int ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
		public long nextLong() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; long ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
		public char nextChar() throws IOException { while(true) { final int c = read(); if(!isSpace[c]) { return (char)c; } } }
		int reads(int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } if(str.length == len) { char[] rep = new char[str.length * 3 / 2]; System.arraycopy(str, 0, rep, 0, str.length); str = rep; } str[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
		int reads(char[] cs, int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } cs[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
		public char[] nextLine() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isLineSep); try { if(str[len-1] == '\r') { len--; read(); } } catch(EndOfFileRuntimeException e) { ; } return Arrays.copyOf(str, len); }
		public String nextString() throws IOException { return new String(next()); }
		public char[] next() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); return Arrays.copyOf(str, len); }
		public int next(char[] cs) throws IOException { int len = 0; cs[len++] = nextChar(); len = reads(cs, len, isSpace); return len; }
		public double nextDouble() throws IOException { return Double.parseDouble(nextString()); }
		public long[] nextLongArray(final int n) throws IOException { final long[] res = new long[n]; for(int i = 0; i < n; i++) { res[i] = nextLong(); } return res; }
		public int[] nextIntArray(final int n) throws IOException { final int[] res = new int[n]; for(int i = 0; i < n; i++) { res[i] = nextInt(); } return res; }
		public int[][] nextIntArray2D(final int n, final int k) throws IOException { final int[][] res = new int[n][]; for(int i = 0; i < n; i++) { res[i] = nextIntArray(k); } return res; }
		public int[][] nextIntArray2DWithIndex(final int n, final int k) throws IOException { final int[][] res = new int[n][k+1]; for(int i = 0; i < n; i++) { for(int j = 0; j < k; j++) { res[i][j] = nextInt(); } res[i][k] = i; } return res; }
		public double[] nextDoubleArray(final int n) throws IOException { final double[] res = new double[n]; for(int i = 0; i < n; i++) { res[i] = nextDouble(); } return res; }
	}
}
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