嵊州D3T2 福尔贝斯太太的快乐夏日 summer

 

 

宗教,或是无节制的*主义,是致人腐化的毒剂。

现在,一个人要经历 n 个事件,编号为 1 ∼ n。

经历 x 号事件,他的危险值就会增加 x。

一开始他的危险值是 0。

当一个人的危险值大于 0 且是 3 的倍数的时候,他会丧失生存的意义,而沉溺于享乐之中,不会再 去经历后面的事件。

那么,有多少种安排经历这 n 个事件的顺序,使得这个人能经历全部 n 个事件?

即有多少种 n 的全排列 A,满足以下条件:

嵊州D3T2 福尔贝斯太太的快乐夏日 summer

 

请给出答案 %10000000000037 的结果。

Input

第一行一个整数 T,表示数据组数。

对于每组数据,一行一个整数 n 表示事件数。

Output

一行一个整数表示答案。

Examples

summer.in summer.out

3

4

461350

946122

6

8077061242588

9686440545236 

 

 

 

Notes

对于所有数据,满足 0 ≤ T ≤ 3 , 3 ≤ n ≤ 3 ∗ 10^9。

Subtask1[3pts]

T = 0

Subtask2[26pts]

n ≤ 8

Subtask3[24pts]

n ≤ 10^3

Subtask4[10pts]

n ≤ 3 ∗ 10^6

Subtask5[14pts]

n ≤ 3 ∗ 10^7

Subtask6[11pts]

n ≤ 3 ∗ 10^8

Subtask7[12pts]

无特殊限制

 


 

 暴力法

假如n<10的话,我们就可以用这种方法(不想看就跳过吧)

#include<bits/stdc++.h>
using namespace std;
const int inf = 0x3f3f3f; 
int per[inf];
int main(){
    freopen("summer.in","r",stdin);
    freopen("summer.out","w",stdout);
    int t;
    cin>>t;
    if(t==0) return 0;//3分!
    //输入与输出并存 
    long long n;
    for(int i=0;i<t;i++){
        cin>>n;
        long long out=0,dan=0;
        for(int j=1;j<=n;j++)
            per[j]=j;
        while(next_permutation(per+1,per+n+1))
        {
            dan=0;
            for(int j=1;j<=n;j++){
                dan+=per[j];
                dan%=3;
                if(dan==0) break;
                    if(j==n) out++;
                out%=10000000000037;
            }
        }
        cout<<out<<endl;
    }
    return 0;
}
//请给出答案 %10000000000037 的结果 
//思考:当t==0时,输出空白还是0? 

这道题最大的敌人就是超时

要么,事先打表

要么,有公式

要么,3分。。。

而我呢

公式不会,

打表打错了

我是不是没救了?

 解释一下代码:

其中有个

while(next_permutation(per+1,per+n+1))

 下一个排列函数。

请参考https://www.cnblogs.com/send-off-a-friend/p/11178134.html

 我写的一篇博客,有关于next_permutation()的哟

 


 

std 

就用公式就好了!

分类讨论三种(其实是两种)

 1 #include <cstdio>
 2 #define FOR(i, l, r) for(long long i = l; i <= r; ++i)
 3 
 4 using namespace std;
 5 
 6 const long long mod = 10000000000037ll;
 7 const long long FAC[3010] = 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 8 
 9 long long n, m;
10 int T;
11 
12 long long mul(long long a, long long b)
13 {
14     long long tmp = (a * b - (long long)((long double)a / mod * b + 1e-8) * mod);
15     if (tmp < 0) tmp += mod; return tmp;
16 }
17 long long sqr(long long x) {return mul(x, x);}
18 
19 long long pow(long long a, long long b)
20 {
21     a %= mod, b %= mod; 
22     long long ans = 1;
23     for(; b; b >>= 1)
24     {
25         if (b & 1) ans = mul(ans, a);
26         a = mul(a, a);
27     }    
28     return ans;
29 }
30 long long inv(long long x) {return pow(x, mod - 2);}
31 
32 long long fac(long long x)
33 {
34     long long ans = FAC[x / 1000000];
35     FOR(i, x / 1000000 * 1000000 + 1, x) ans = mul(ans, i);
36     return ans;
37 }
38 
39 void work()
40 {
41     scanf("%long longd", &m); n = m / 3;
42     if (m % 3 == 0) printf("%long longd\n", mul(mul(fac(3 * n - 2), sqr(fac(n))), inv(fac(2 * n - 2))) * 2ll % mod); else
43     if (m % 3 == 1) printf("%long longd\n", mul(mul(mul(fac(3 * n), sqr(fac(n))), inv(fac(2 * n))), n + 1)); else
44         printf("%long longd\n", mul(2ll * sqr(n + 1), mul(mul(fac(3 * n), sqr(fac(n))), inv(fac(2 * n)))));    
45 }
46 
47 int main()
48 {
49 //    freopen("summer.in", "r", stdin);
50 //    freopen("summer.out", "w", stdout);
51     
52     scanf("%d", &T);
53     while (T--) work();
54     
55     return 0;
56 } 

 OK!

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