add new solutions

solutions/13/q1318/solution.go

@@ -0,0 +1,28 @@
+package q1318
+
+func minFlips(a int, b int, c int) int {
+	aorb := a | b
+	flips := 0
+
+	p := 1
+	for p <= aorb || p <= c {
+		switch {
+		case c|p == c && aorb|p != aorb:
+			flips++ // c has the bit
+
+		case c|p != c && aorb|p == aorb:
+			if a|p == a {
+				flips++ // a has the bit
+			}
+			if b|p == b {
+				flips++ // b has the bit
+			}
+		}
+
+		p <<= 1
+	}
+
+	return flips
+}
+
+var _ = minFlips