Prevent overflow in AreSame comparison

Author: krotname

src/main/java/kyu6/AreSame.java

@@ -12,10 +12,11 @@ public class AreSame {
     public static boolean comp(int[] a, int[] b) {
         return a != null && b != null && Arrays.equals(
                 Arrays.stream(a)
-                        .map(i -> i * i)
+                        .mapToLong(i -> (long) i * i)
                         .sorted()
                         .toArray(),
                 Arrays.stream(b)
+                        .mapToLong(i -> i)
                         .sorted()
                         .toArray());
     }

src/test/java/kyu6/AreSameTest.java

@@ -17,6 +17,12 @@
 import static kyu6.AreSame.*;
 @Tag("smoke")
 public class AreSameTest {
+    @Test
+    void rejectsOverflowedSquares() {
+        assertFalse(comp(new int[]{46341}, new int[]{-2147479015}));
+        assertFalse(comp(new int[]{Integer.MIN_VALUE}, new int[]{0}));
+    }
+
     @Test
     void smokeTestsShouldExecuteApi() {
         quality.SmokeMethodTestHarness.verify(kyu6.AreSame.class);