結果

問題 No.1127 変形パスカルの三角形
ユーザー 👑 Kazun
提出日時 2021-01-29 17:53:41
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 229 ms / 1,500 ms
コード長 4,435 bytes
コンパイル時間 322 ms
コンパイル使用メモリ 82,028 KB
実行使用メモリ 116,864 KB
最終ジャッジ日時 2024-06-27 04:44:23
合計ジャッジ時間 6,961 ms
ジャッジサーバーID
(参考情報)
judge4 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 30
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 #
プレゼンテーションモードにする

class Modulo_Error(Exception):
pass
class Modulo():
def __init__(self,a,n):
self.a=a%n
self.n=n
def __str__(self):
return "{} (mod {})".format(self.a,self.n)
def __repr__(self):
return self.__str__()
#+,-
def __pos__(self):
return self
def __neg__(self):
return Modulo(-self.a,self.n)
#,
def __eq__(self,other):
if isinstance(other,Modulo):
return (self.a==other.a) and (self.n==other.n)
elif isinstance(other,int):
return (self-other).a==0
def __neq__(self,other):
return not(self==other)
def __le__(self,other):
a,p=self.a,self.n
b,q=other.a,other.n
return (a-b)%q==0 and p%q==0
def __ge__(self,other):
return other<=self
def __lt__(self,other):
return (self<=other) and (self!=other)
def __gt__(self,other):
return (self>=other) and (self!=other)
#
def __add__(self,other):
if isinstance(other,Modulo):
if self.n!=other.n:
raise Modulo_Error(".")
return Modulo(self.a+other.a,self.n)
elif isinstance(other,int):
return Modulo(self.a+other,self.n)
def __radd__(self,other):
if isinstance(other,int):
return Modulo(self.a+other,self.n)
#
def __sub__(self,other):
return self+(-other)
def __rsub__(self,other):
if isinstance(other,int):
return -self+other
#
def __mul__(self,other):
if isinstance(other,Modulo):
if self.n!=other.n:
raise Modulo_Error(".")
return Modulo(self.a*other.a,self.n)
elif isinstance(other,int):
return Modulo(self.a*other,self.n)
def __rmul__(self,other):
if isinstance(other,int):
return Modulo(self.a*other,self.n)
#Modulo
def inverse(self):
return self.Modulo_Inverse()
def Modulo_Inverse(self):
x0, y0, x1, y1 = 1, 0, 0, 1
a,b=self.a,self.n
while b != 0:
q, a, b = a // b, b, a % b
x0, x1 = x1, x0 - q * x1
y0, y1 = y1, y0 - q * y1
if a!=1:
raise Modulo_Error("{}".format(self))
else:
return Modulo(x0,self.n)
#
def __truediv__(self,other):
return self*(other.Modulo_Inverse())
def __rtruediv__(self,other):
return other*(self.Modulo_Inverse())
#
def __pow__(self,other):
if isinstance(other,int):
u=abs(other)
r=Modulo(pow(self.a,u,self.n),self.n)
if other>=0:
return r
else:
return r.Modulo_Inverse()
else:
b,n=other.a,other.n
if pow(self.a,n,self.n)!=1:
raise Modulo_Error(".")
else:
return self**b
def Factor_Modulo(N,M,Mode=0):
"""
Mode=0:N! (mod M) .
Mode=1:k! (mod M) (k=0,1,...,N) .
[]
O(N)
"""
if Mode==0:
X=Modulo(1,M)
for k in range(1,N+1):
X*=k
return X
else:
L=[Modulo(1,M)]*(N+1)
for k in range(1,N+1):
L[k]=k*L[k-1]
return L
def Factor_Modulo_with_Inverse(N,M):
"""
k=0,1,...,N k! (mod M) (k!)^(-1) (mod M) .
[]
N,M:
M>0
[]
N+1 (F,G):F[k]=k! (mod M), G[k]=(k!)^(-1) (mod M)
[]
O(N)
"""
assert M>0
F=Factor_Modulo(N,M,Mode=1)
G=[0]*(N+1)
G[-1]=F[-1].inverse()
for k in range(N,0,-1):
G[k-1]=k*G[k]
return F,G
#================================================
def nCr(n,r):
if 0<=r<=n:
return F[n]*G[r]*G[n-r]
else:
return Modulo(0,Mod)
#================================================
Mod=10**9+7
a,b=map(int,input().split())
N,K=map(int,input().split())
F,G=Factor_Modulo_with_Inverse(N+1,Mod)
X=Modulo(0,Mod)
for k in range(1,N+2):
p=a*nCr(N-1,k-1)
q=b*nCr(N-1,k-2)
X+=pow(p+q,2)
print((a*nCr(N-1,K-1)+b*nCr(N-1,K-2)).a)
print(X.a)
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