problems(cpp): add “1318. Minimum Flips to Make a OR b Equal to c”

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

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

@@ -0,0 +1,38 @@
+#include <cassert>
+#include <tuple>
+
+class Solution {
+public:
+    int minFlips(int a, int b, int c)
+    {
+        auto flips = 0;
+
+        for (; (a | b) != c; a >>= 1, b >>= 1, c >>= 1) {
+            auto [aa, bb, cc] = std::tuple { a & 1, b & 1, c & 1 };
+
+            if ((aa | bb) == cc) {
+                continue;
+            }
+
+            if (aa && bb) {
+                flips += 2;
+            } else {
+                flips++;
+            }
+        }
+
+        return flips;
+    }
+};
+
+int main()
+{
+    Solution s;
+
+    assert(s.minFlips(2, 6, 5) == 3);
+    assert(s.minFlips(4, 2, 7) == 1);
+    assert(s.minFlips(1, 2, 3) == 0);
+    assert(s.minFlips(8, 3, 5) == 3); // 1000 | 0011 = 0101
+
+    return 0;
+}