50题解决中，已有简单解法，在尝试更快的版本。

uv.lock

@@ -2,6 +2,66 @@ version = 1
 revision = 3
 requires-python = ">=3.12"
 
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+
 [[package]]
 name = "click"
 version = "8.3.1"
@@ -130,6 +190,7 @@ name = "projecteuler"
 version = "0.1.0"
 source = { virtual = "." }
 dependencies = [
+    { name = "bitarray" },
     { name = "mplusa" },
     { name = "numpy" },
     { name = "sympy" },
@@ -138,6 +199,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
+    { name = "bitarray", specifier = ">=3.8.0" },
     { name = "mplusa", specifier = ">=0.0.3" },
     { name = "numpy", specifier = ">=2.3.5" },
     { name = "sympy", specifier = ">=1.14.0" },