Precreation contest files

Codeforces/CodeforcesRound1035(Div2)/AAddorXOR/solution.cpp

@@ -0,0 +1,43 @@
+#include <iostream>
+
+using namespace std;
+
+void solve() {
+  int a, b, x, y;
+  cin >> a >> b >> x >> y;
+
+  if (a > b) {
+    if (a - b == 1) {
+      if (a % 2 != 0) {
+        cout << y << endl;
+        return;
+      }
+    }
+    cout << "-1\n";
+
+    return;
+  }
+
+  int diff = b - a;
+  int xdiff = diff * x;
+  if (diff % 2 == 0) {
+    cout << min(xdiff, ((diff * x) / 2) + ((diff * y) / 2)) << endl;
+    return;
+  } else {
+    if (a % 2 != 0) {
+
+      cout << min(xdiff, (diff / 2 + 1) * x + (diff / 2) * y) << endl;
+      return;
+    } else {
+      cout << min(xdiff, (diff / 2) * x + (diff / 2 + 1) * y) << endl;
+      return;
+    }
+  }
+}
+
+int main() {
+  int t;
+  cin >> t;
+  while (t--)
+    solve();
+}