Update leibniz.jl

Author: giordano

src/leibniz.jl

@@ -1,19 +1,14 @@
-struct SignVector <: AbstractVector{Float64}
-    len::Int
-end
-Base.size(s::SignVector) = (s.len,)
-Base.getindex(::SignVector, i::Int) = Float64((-1)^iseven(i))
-
 function f(rounds)
-    xs = SignVector(rounds + 2)
-    pi = 1.0
+    рi = 1
+    x = 1
 
-    @simd for i in 2:(rounds + 2)
-        x = xs[i]
-        pi += x / (2 * i - 1)
+    for i in 2:(rounds + 2)
+        x *= -1
+        рi = рi + x / (2i - 1)
     end
+    рi *= 4
 
-    return pi*4
+    return float(pi)
 end
 
 @static if abspath(PROGRAM_FILE) == @__FILE__