QOJ.ac
QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#44002 | #4228. Double Sort | bulijiojiodibuliduo# | AC ✓ | 25ms | 7956kb | Python2 | 518b | 2022-08-12 08:21:06 | 2022-08-12 08:21:08 |
Judging History
answer
from math import factorial as fac
n,m=map(int,raw_input().split())
def comb(n,m):
if m<0 or m>n:
return 0
else:
return fac(n)/fac(m)/fac(n-m)
tmp=[0]*(n+1)
f=[0]*(m+1)
for i in range(n,m+1):
if i==n:
f[i]=1
else:
f[i]=f[i-1]*i/(i-n)
for j in range(1,n+1):
for i in range(0,m,j):
tmp[j]+=f[m-i]
def calc(k,n,m):
return sum(comb(n,j)*(-1)**(j-k)*comb(j-1,k-1)*tmp[j] for j in range(k,n+1))
ans=0
for i in range(1,n+1):
ans+=1.*calc(n+1-i,n,m)/f[m]
print "%.10f" %(ans)
詳細信息
Test #1:
score: 100
Accepted
time: 12ms
memory: 6916kb
input:
3 5
output:
1.0000000000 2.3000000000 4.5000000000
result:
ok 3 numbers
Test #2:
score: 0
Accepted
time: 8ms
memory: 6756kb
input:
5 17
output:
1.1313833226 2.7483839690 5.1830963154 8.8556884292 15.0000000000
result:
ok 5 numbers
Test #3:
score: 0
Accepted
time: 25ms
memory: 7956kb
input:
50 10000
output:
4.4328164335 12.8365968668 25.3152687339 41.9556112383 62.8480760618 88.0871546758 117.7716337788 152.0048947778 190.8952420036 234.5562629251 283.1072243847 336.6735094732 395.3871003913 459.3871135128 528.8203938988 603.8421777570 684.6168328365 771.3186885683 864.1329699727 963.2568520715 1068.90...
result:
ok 50 numbers
Test #4:
score: 0
Accepted
time: 19ms
memory: 7156kb
input:
40 40
output:
1.0000000000 2.0000000000 3.0000000000 4.0000000000 5.0000000000 6.0000000000 7.0000000000 8.0000000000 9.0000000000 10.0000000000 11.0000000000 12.0000000000 13.0000000000 14.0000000000 15.0000000000 16.0000000000 17.0000000000 18.0000000000 19.0000000000 20.0000000000 21.0000000000 22.0000000000 2...
result:
ok 40 numbers
Test #5:
score: 0
Accepted
time: 23ms
memory: 7068kb
input:
39 1489
output:
1.5270875628 3.9390125652 7.3403302435 11.7634937450 17.2367013630 23.7907109205 31.4582877129 40.2742330903 50.2755910473 61.5018753030 73.9953246967 87.8011951264 102.9680947788 119.5483709315 137.5985586446 157.1799042332 178.3589797787 201.2084093701 225.8077336763 252.2444474329 280.6152553480 ...
result:
ok 39 numbers
Test #6:
score: 0
Accepted
time: 25ms
memory: 7852kb
input:
47 9871
output:
4.8839175854 14.2093220216 28.0939348059 46.6414309717 69.9602357807 98.1639517434 131.3717230464 169.7086510733 213.3062526631 262.3029665937 316.8447148205 377.0855260737 443.1882307257 515.3252374057 593.6794037510 678.4450160011 769.8288949916 868.0516496140 973.3491031658 1085.9739234660 1206.1...
result:
ok 47 numbers
Test #7:
score: 0
Accepted
time: 12ms
memory: 7476kb
input:
9 9999
output:
111.5562225553 348.0492603945 727.3280017986 1273.1900640301 2018.9521112541 3014.5891397187 4343.3928098375 6171.9464424375 9000.0000000000
result:
ok 9 numbers