結果

問題 No.660 家を通り過ぎないランダムウォーク問題
ユーザー uwiuwi
提出日時 2018-03-02 22:46:13
言語 Java19
(openjdk 21)
結果
AC  
実行時間 108 ms / 2,000 ms
コード長 4,293 bytes
コンパイル時間 3,776 ms
コンパイル使用メモリ 81,980 KB
実行使用メモリ 59,252 KB
最終ジャッジ日時 2023-09-04 04:58:40
合計ジャッジ時間 9,900 ms
ジャッジサーバーID
(参考情報)
judge12 / judge15
このコードへのチャレンジ(β)

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 93 ms
57,060 KB
testcase_01 AC 93 ms
57,144 KB
testcase_02 AC 93 ms
57,096 KB
testcase_03 AC 94 ms
55,196 KB
testcase_04 AC 94 ms
57,256 KB
testcase_05 AC 94 ms
57,088 KB
testcase_06 AC 93 ms
57,272 KB
testcase_07 AC 93 ms
57,108 KB
testcase_08 AC 93 ms
57,068 KB
testcase_09 AC 94 ms
57,136 KB
testcase_10 AC 92 ms
57,192 KB
testcase_11 AC 93 ms
57,212 KB
testcase_12 AC 95 ms
57,404 KB
testcase_13 AC 93 ms
57,252 KB
testcase_14 AC 93 ms
57,224 KB
testcase_15 AC 93 ms
57,196 KB
testcase_16 AC 93 ms
57,176 KB
testcase_17 AC 93 ms
57,448 KB
testcase_18 AC 93 ms
57,068 KB
testcase_19 AC 93 ms
57,096 KB
testcase_20 AC 93 ms
57,092 KB
testcase_21 AC 94 ms
57,068 KB
testcase_22 AC 94 ms
57,200 KB
testcase_23 AC 94 ms
57,188 KB
testcase_24 AC 94 ms
57,096 KB
testcase_25 AC 93 ms
56,988 KB
testcase_26 AC 94 ms
57,080 KB
testcase_27 AC 94 ms
57,128 KB
testcase_28 AC 94 ms
57,452 KB
testcase_29 AC 94 ms
56,992 KB
testcase_30 AC 94 ms
57,220 KB
testcase_31 AC 95 ms
57,156 KB
testcase_32 AC 96 ms
57,236 KB
testcase_33 AC 95 ms
57,272 KB
testcase_34 AC 96 ms
56,948 KB
testcase_35 AC 97 ms
57,148 KB
testcase_36 AC 97 ms
55,152 KB
testcase_37 AC 97 ms
57,132 KB
testcase_38 AC 101 ms
57,452 KB
testcase_39 AC 101 ms
57,144 KB
testcase_40 AC 100 ms
57,140 KB
testcase_41 AC 105 ms
57,132 KB
testcase_42 AC 105 ms
57,244 KB
testcase_43 AC 106 ms
59,252 KB
testcase_44 AC 108 ms
57,148 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 #

package contest180302;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class E {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni();
		int mod = 1000000007;
		long ans =0;
		int[][] fif = enumFIF(1000000, mod);
		for(int x = 0;n+x*2 <= 2*n;x++){
			// (x,n+x)
			long base = C(n+x*2-1, x, mod, fif) - C(n+x*2-1, x-1, mod, fif);
			ans += base;
		}
		ans %= mod;
		if(ans < 0)ans += mod;
		out.println(ans);
	}
	
	public static long pow(long a, long n, long mod) {
		//		a %= mod;
		long ret = 1;
		int x = 63 - Long.numberOfLeadingZeros(n);
		for (; x >= 0; x--) {
			ret = ret * ret % mod;
			if (n << 63 - x < 0)
				ret = ret * a % mod;
		}
		return ret;
	}

	
	public static long C(int n, int r, int mod, int[][] fif) {
		if (n < 0 || r < 0 || r > n)
			return 0;
		return (long) fif[0][n] * fif[1][r] % mod * fif[1][n - r] % mod;
	}

	
	public static int[][] enumFIF(int n, int mod) {
		int[] f = new int[n + 1];
		int[] invf = new int[n + 1];
		f[0] = 1;
		for (int i = 1; i <= n; i++) {
			f[i] = (int) ((long) f[i - 1] * i % mod);
		}
		long a = f[n];
		long b = mod;
		long p = 1, q = 0;
		while (b > 0) {
			long c = a / b;
			long d;
			d = a;
			a = b;
			b = d % b;
			d = p;
			p = q;
			q = d - c * q;
		}
		invf[n] = (int) (p < 0 ? p + mod : p);
		for (int i = n - 1; i >= 0; i--) {
			invf[i] = (int) ((long) invf[i + 1] * (i + 1) % mod);
		}
		return new int[][] { f, invf };
	}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new E().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}
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