Create 2074C-XORandTriangle.cpp

Author: DionysiosB

2074C-XORandTriangle.cpp

@@ -0,0 +1,11 @@
+#include <cstdio>
+
+int main() {
+
+    long t; scanf("%ld", &t);
+    while(t--){
+        long x; scanf("%ld", &x);
+        long y = (x & -x) | (~x & -~x);
+        printf("%ld\n", (y < x ? y : -1));
+    }
+}