結果

問題 No.906 Y字グラフ
ユーザー uwiuwi
提出日時 2019-10-11 21:34:39
言語 Java21
(openjdk 21)
結果
AC  
実行時間 56 ms / 2,000 ms
コード長 3,664 bytes
コンパイル時間 4,687 ms
コンパイル使用メモリ 86,332 KB
実行使用メモリ 37,068 KB
最終ジャッジ日時 2024-05-04 01:07:02
合計ジャッジ時間 6,846 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
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 51 ms
36,884 KB
testcase_01 AC 52 ms
36,472 KB
testcase_02 AC 55 ms
36,812 KB
testcase_03 AC 52 ms
37,040 KB
testcase_04 AC 51 ms
36,468 KB
testcase_05 AC 51 ms
37,064 KB
testcase_06 AC 53 ms
36,480 KB
testcase_07 AC 52 ms
36,992 KB
testcase_08 AC 52 ms
36,864 KB
testcase_09 AC 53 ms
37,028 KB
testcase_10 AC 54 ms
36,608 KB
testcase_11 AC 53 ms
37,024 KB
testcase_12 AC 53 ms
36,848 KB
testcase_13 AC 52 ms
36,756 KB
testcase_14 AC 51 ms
36,804 KB
testcase_15 AC 53 ms
36,736 KB
testcase_16 AC 51 ms
36,628 KB
testcase_17 AC 52 ms
36,980 KB
testcase_18 AC 51 ms
36,888 KB
testcase_19 AC 53 ms
36,480 KB
testcase_20 AC 54 ms
36,888 KB
testcase_21 AC 51 ms
36,628 KB
testcase_22 AC 51 ms
36,736 KB
testcase_23 AC 52 ms
37,040 KB
testcase_24 AC 52 ms
36,740 KB
testcase_25 AC 51 ms
36,848 KB
testcase_26 AC 51 ms
37,040 KB
testcase_27 AC 52 ms
37,068 KB
testcase_28 AC 52 ms
36,704 KB
testcase_29 AC 52 ms
37,040 KB
testcase_30 AC 56 ms
36,752 KB
testcase_31 AC 53 ms
36,956 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 contest1910;
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 D {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		long n = nl();
		int mod = 1000000007;
		// C(n-1+2-3,2) 10
		// 2a+b=n-1, a <= (n-4)/2 2
		// (n-1)%3
		
		long ans = c2(n-2, mod);
		long v2 = (n-2)/2;
		long v3 = (n-1) % 3 == 0 ? 1 : 0;
		out.println((ans + v2*3 + v3*2) % mod * invl(6, mod) % mod);
	}
	
	public static long invl(long a, long mod) {
		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;
		}
		return p < 0 ? p + mod : p;
	}

	
	public static long c2(long n, int mod)
	{
		if(n % 2 == 0){
			return (n/2%mod)*((n-1)%mod)%mod;
		}else{
			return (n%mod)*((n-1)/2%mod)%mod;
		}
	}

	
	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 D().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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