cs: add “1318. Minimum Flips to Make a OR b Equal to c”

Signed-off-by: Matej Focko <mfocko@redhat.com>

cs/minimum-flips-to-make-a-or-b-equal-to-c.cs

@@ -0,0 +1,21 @@
+public class Solution {
+    public int MinFlips(int a, int b, int c) {
+        var flips = 0;
+
+        for (; (a | b) != c; a >>= 1, b >>= 1, c >>= 1) {
+            var (aa, bb, cc) = (a & 1, b & 1, c & 1);
+
+            if ((aa | bb) == cc) {
+                continue;
+            }
+
+            if (aa != 0 && bb != 0) {
+                flips += 2;
+            } else {
+                ++flips;
+            }
+        }
+
+        return flips;
+    }
+}