#334480 (Ruby) No.3048 Order and Harmony

• 問題: No.3048 Order and Harmony
• ユーザー: betrue12
• 提出日時: 2019-04-02 00:19:36
• 言語: Ruby (3.3.0)
• 結果: AC
• 実行時間: 236 ms / 2,000 ms
• コード長: 24,357 bytes
• コンパイル時間: 79 ms
• コンパイル使用メモリ: 7,808 KB
• 実行使用メモリ: 12,672 KB
• 最終ジャッジ日時: 2024-05-05 10:42:53
• 合計ジャッジ時間: 9,134 ms
• ジャッジサーバーID （参考情報）: judge5 / judge4

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	82 ms; 12,416 KB
testcase_01	AC	82 ms; 12,416 KB
testcase_02	AC	89 ms; 12,288 KB
testcase_03	AC	135 ms; 12,544 KB
testcase_04	AC	74 ms; 12,288 KB
testcase_05	AC	76 ms; 12,416 KB
testcase_06	AC	82 ms; 12,288 KB
testcase_07	AC	76 ms; 12,416 KB
testcase_08	AC	81 ms; 12,416 KB
testcase_09	AC	74 ms; 12,544 KB
testcase_10	AC	84 ms; 12,672 KB
testcase_11	AC	79 ms; 12,416 KB
testcase_12	AC	77 ms; 12,544 KB
testcase_13	AC	76 ms; 12,416 KB
testcase_14	AC	77 ms; 12,416 KB
testcase_15	AC	87 ms; 12,416 KB
testcase_16	AC	79 ms; 12,416 KB
testcase_17	AC	79 ms; 12,288 KB
testcase_18	AC	76 ms; 12,288 KB
testcase_19	AC	87 ms; 12,672 KB
testcase_20	AC	87 ms; 12,288 KB
testcase_21	AC	88 ms; 12,544 KB
testcase_22	AC	83 ms; 12,288 KB
testcase_23	AC	77 ms; 12,288 KB
testcase_24	AC	77 ms; 12,416 KB
testcase_25	AC	118 ms; 12,288 KB
testcase_26	AC	144 ms; 12,672 KB
testcase_27	AC	148 ms; 12,288 KB
testcase_28	AC	143 ms; 12,416 KB
testcase_29	AC	76 ms; 12,544 KB
testcase_30	AC	119 ms; 12,416 KB
testcase_31	AC	79 ms; 12,288 KB
testcase_32	AC	135 ms; 12,416 KB
testcase_33	AC	79 ms; 12,288 KB
testcase_34	AC	94 ms; 12,544 KB
testcase_35	AC	79 ms; 12,544 KB
testcase_36	AC	222 ms; 12,288 KB
testcase_37	AC	181 ms; 12,544 KB
testcase_38	AC	201 ms; 12,416 KB
testcase_39	AC	170 ms; 12,544 KB
testcase_40	AC	125 ms; 12,672 KB
testcase_41	AC	152 ms; 12,544 KB
testcase_42	AC	195 ms; 12,544 KB
testcase_43	AC	77 ms; 12,544 KB
testcase_44	AC	171 ms; 12,416 KB
testcase_45	AC	232 ms; 12,544 KB
testcase_46	AC	232 ms; 12,416 KB
testcase_47	AC	109 ms; 12,544 KB
testcase_48	AC	148 ms; 12,416 KB
testcase_49	AC	76 ms; 12,288 KB
testcase_50	AC	132 ms; 12,416 KB
testcase_51	AC	79 ms; 12,288 KB
testcase_52	AC	76 ms; 12,544 KB
testcase_53	AC	152 ms; 12,288 KB
testcase_54	AC	75 ms; 12,416 KB
testcase_55	AC	76 ms; 12,288 KB
testcase_56	AC	135 ms; 12,416 KB
testcase_57	AC	77 ms; 12,416 KB
testcase_58	AC	76 ms; 12,544 KB
testcase_59	AC	77 ms; 12,544 KB
testcase_60	AC	143 ms; 12,416 KB
testcase_61	AC	170 ms; 12,544 KB
testcase_62	AC	146 ms; 12,544 KB
testcase_63	AC	74 ms; 12,288 KB
testcase_64	AC	236 ms; 12,416 KB

コンパイルメッセージ

Syntax OK

ソースコード

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988000000 => 73146164,
989000000 => 954958912,
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991000000 => 241289571,
992000000 => 646654592,
993000000 => 216046746,
994000000 => 205951465,
995000000 => 3258987,
996000000 => 780882948,
997000000 => 822439091,
998000000 => 598245292,
999000000 => 869544707,
1000000000 => 698611116,
}

MOD = 10**9+7
M = 10**6

def fact(n)
    m = n/M*M
    ret = MEMO[m]
    ((m+1)..n).each do |i|
        ret = ret * i % MOD
    end
    ret
end

def extgcd(a, b)
    if b == 0
        {x: 1, y: 0, gcd: a}
    else
        prev = extgcd(b, a % b)
        {
            x: prev[:y],
            y: prev[:x] - (a / b) * prev[:y],
            gcd: prev[:gcd]
        }
    end
end

def inv_mod(num)
    hash = extgcd(num, MOD)
    hash[:x] % MOD
end


K = gets.to_i

if K % 2 == 1
    puts 0
else
    inv = inv_mod(fact(K/2))
    puts fact(K) * (inv**2) % MOD
end