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Author: joybanerjee08

multiplication/karatsuba.py

@@ -0,0 +1,16 @@
+def karatsuba(x,y):
+	if len(str(x)) or len(str(y)) :
+		return x*y
+	else:
+		n = max(len(str(x)),len(str(y)))
+		z = n / 2
+		a = x / 10**(z)
+		b = x % 10**(z)
+		c = y / 10**(z)
+		d = y % 10**(z)
+		ac = karatsuba(a,c)
+		bd = karatsuba(b,d)
+		adbc = karatsuba(a+b,c+d) - ac - bd
+		return ac * 10**(2*z) + (adbc * 10**z) + bd
+
+karatsuba (923,1723)