結果

問題 No.118 門松列(2)
ユーザー t8m8⛄️t8m8⛄️
提出日時 2015-03-12 09:25:01
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 4,165 bytes
コンパイル時間 3,650 ms
コンパイル使用メモリ 77,380 KB
実行使用メモリ 56,288 KB
最終ジャッジ日時 2023-09-06 23:22:22
合計ジャッジ時間 7,659 ms
ジャッジサーバーID
(参考情報)
judge15 / judge11
このコードへのチャレンジ
(要ログイン)

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
50,428 KB
testcase_01 WA -
testcase_02 WA -
testcase_03 WA -
testcase_04 WA -
testcase_05 WA -
testcase_06 AC 43 ms
49,832 KB
testcase_07 AC 43 ms
49,656 KB
testcase_08 AC 43 ms
49,748 KB
testcase_09 WA -
testcase_10 WA -
testcase_11 WA -
testcase_12 WA -
testcase_13 WA -
testcase_14 WA -
testcase_15 WA -
testcase_16 WA -
testcase_17 WA -
testcase_18 WA -
testcase_19 WA -
testcase_20 WA -
testcase_21 WA -
testcase_22 WA -
testcase_23 WA -
testcase_24 WA -
testcase_25 WA -
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 #

//No.118 門松列(2)

import java.util.*;
import java.io.*;
import java.math.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No118 {

    static final InputStream in = System.in;
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve(){
        int n = nextInt();
        int[] a = nextArrayInt(n);
        sort(a);
        long mul = 1;
        int cnt = 1;
        Set<Integer> set = new HashSet<Integer>();

        for (int i=0; i<n; i++) {
            set.add(a[i]);
            if (i < n-1 && a[i] == a[i+1]) {
                cnt++;
            }else {
                mul *= cnt;
                cnt = 1;
            }
        }

        BigInteger MOD = new BigInteger("1000000007");
        out.println(combination(set.size(),3,MOD).multiply(BigInteger.valueOf(mul)).mod(MOD));
    }

    static BigInteger combination(int n, int r, BigInteger MOD) {
        BigInteger ret = BigInteger.ONE;
        for (int i=n-r+1; i<=n; i++) ret = ret.multiply(BigInteger.valueOf(i));
        for (int i=1; i<=r; i++) ret = ret.divide(BigInteger.valueOf(i));
        ret = ret.mod(MOD);
        return  ret;
    }

    public static void main(String[] args) throws Exception {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}

    static final byte[] buf = new byte[1024];
    static int ptr = 0;
    static int buflen = 0;

    static boolean hasNextByte() {
        if (ptr < buflen)
            return true;
        ptr = 0;
        try{
            buflen = in.read(buf);
        }catch (IOException e) {e.printStackTrace();}
        if (buflen <= 0)
            return false;
        return true;
    }

    static int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}

    static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}

    static void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}

    static boolean hasNext() {skip(); return hasNextByte();}

    static String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    static long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        boolean minus = false;
        long num = readByte();

        if(num == '-'){
            num = 0;
            minus = true;
        }else if (num < '0' || '9' < num){
            throw new NumberFormatException();
        }else{
            num -= '0';
        }
        
        while(true){
            int b = readByte();
            if('0' <= b && b <= '9')
                num = num * 10 + (b - '0');
            else if(b == -1 || !isPrintableChar(b))
                return minus ? -num : num;
            else
                throw new NoSuchElementException();
        }
    }

    static int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }

    static double nextDouble() {
        return Double.parseDouble(next());
    }

    static char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }

    static String nextLine() {
        while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
        if (!hasNextByte()) throw new NoSuchElementException();

        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (b != '\n' && b != '\r') {
            sb.appendCodePoint(b);
            b = readByte();
        }

        return sb.toString();
    }

    static int[] nextArrayInt(int n) {
        int[] a = new int[n];
        for (int i=0; i<n; i++) a[i] = nextInt();
        return a;
    }
}
0