Merge pull request #31 from ridwanfathin/master

add fast pow: O(log n) exponent
0xAX · Oct 11, 2020 · e1dcce7 · e1dcce7
2 parents b1e2c28 + 0780e4b
commit e1dcce7
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/numerical/fast_pow.go b/numerical/fast_pow.go
@@ -0,0 +1,16 @@
+package numerical
+
+//O(log n) function for pow(x, y)
+func FastPow(n uint, power uint) uint {
+	var res uint = 1
+	for power > 0 {
+
+		if (power & 1) != 0 {
+			res = res * n
+		}
+
+		power = power >> 1
+		n = n * n
+	}
+	return res
+}