add new solutions

solutions/0/q50/solution.go

@@ -0,0 +1,25 @@
+package q50
+
+func myPow(x float64, n int) float64 {
+	neg := n < 0
+	if neg {
+		n = -n
+	}
+
+	var ret float64 = 1
+	for n > 0 {
+		v, p := x, 1
+		for p*2 < n {
+			p *= 2
+			v *= v
+		}
+		n -= p
+		ret *= v
+	}
+	if neg {
+		return 1 / ret
+	}
+	return ret
+}
+
+var _ = myPow