結果

問題 No.754 畳み込みの和
ユーザー yuruhiya
提出日時 2020-07-22 15:54:39
言語 Crystal
(1.14.0)
結果
AC  
実行時間 24 ms / 5,000 ms
コード長 2,010 bytes
コンパイル時間 11,235 ms
コンパイル使用メモリ 294,860 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-06-30 20:42:01
合計ジャッジ時間 11,823 ms
ジャッジサーバーID
(参考情報)
judge5 / judge2
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
other AC * 3
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

struct ModInt
@@MOD = 1_000_000_007i64
def self.mod
@@MOD
end
def self.zero
ModInt.new(0)
end
def initialize(n)
@n = n.to_i64 % @@MOD
end
getter n : Int64
def + : self
self
end
def - : self
ModInt.new(n != 0 ? @@MOD - @n : 0)
end
def +(m)
ModInt.new(@n + m.to_i64 % @@MOD)
end
def -(m)
ModInt.new(@n - m.to_i64 % @@MOD)
end
def *(m)
ModInt.new(@n * m.to_i64 % @@MOD)
end
def /(m)
raise DivisionByZeroError.new if m == 0
a, b, u, v = m.to_i64, @@MOD, 1i64, 0i64
while b != 0
t = a // b
a -= t * b
a, b = b, a
u -= t * v
u, v = v, u
end
ModInt.new(@n * u)
end
def //(m)
self / m
end
def **(m)
t, res = self, ModInt.new(1)
while m > 0
res *= t if m.odd?
t *= t
m >>= 1
end
res
end
def ==(m)
@n == m.to_i64
end
def !=(m)
@n != m.to_i64
end
def succ
self + 1
end
def pred
self - 1
end
def to_i64 : Int64
@n
end
delegate to_s, to: @n
delegate inspect, to: @n
end
class CulSum(T)
def initialize(a : Array(T))
@n = a.size
@s = Array(T).new(@n + 1, T.zero)
@n.times do |i|
@s[i + 1] = @s[i] + a[i]
end
end
def initialize(@n : Int32, &f : Int32 -> T)
@s = Array(T).new(@n + 1, T.zero)
@n.times do |i|
@s[i + 1] = @s[i] + yield(i)
end
end
def initialize(a, &f)
@n = a.size
@s = Array(T).new(@n + 1, T.zero)
@n.times do |i|
@s[i + 1] = @s[i] + yield(a[i])
end
end
def [](l : Int32, r : Int32)
l < r ? @s[r] - @s[l] : 0
end
def [](i : Int32)
@s[i]
end
def [](r : Range(Int32, Int32))
@s[r.exclusive? ? r.end : r.end + 1] - @s[r.begin]
end
def to_a
(0...@n).map { |i| self[i..i] }
end
end
n = read_line.to_i
a = (0..n).map { ModInt.new read_line.to_i }
b = (0..n).map { ModInt.new read_line.to_i }
a_sum = CulSum.new(a)
puts b.each_with_index.sum { |v, i|
v * a_sum[0..n - i]
}
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