1 files changed, 52 insertions, 0 deletions
diff --git a/challenge-191/mohammad-anwar/java/theweeklychallenge/TwiceLargest.java b/challenge-191/mohammad-anwar/java/theweeklychallenge/TwiceLargest.java
new file mode 100644
index 0000000000..5ee4cdde29
--- /dev/null
+++ b/challenge-191/mohammad-anwar/java/theweeklychallenge/TwiceLargest.java
@@ -0,0 +1,52 @@
+package theweeklychallenge;
+
+/*
+
+Week 191:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-191
+
+Task #1: Twice Largest
+
+    You are given list of integers, @list.
+
+    Write a script to find out whether the largest item in the list
+    is at least twice as large as each of the other items.
+
+Compile and Run:
+
+    mohammad-anwar/java$ javac theweeklychallenge/TwiceLargest.java
+    mohammad-anwar/java$ java  theweeklychallenge.TwiceLargest
+
+*/
+
+import java.util.Arrays;
+import junit.framework.TestCase;
+import static junit.framework.Assert.*;
+
+public class TwiceLargest extends TestCase {
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(
+            theweeklychallenge.TwiceLargest.class
+        );
+    }
+
+    public void testTwiceLargest() {
+        assertEquals(twiceLargest(new int[]{1, 2, 3, 4}), -1);
+        assertEquals(twiceLargest(new int[]{1, 2, 0, 5}),  1);
+        assertEquals(twiceLargest(new int[]{2, 6, 3, 1}),  1);
+        assertEquals(twiceLargest(new int[]{4, 5, 2, 3}), -1);
+    }
+
+    public static int twiceLargest(int[] array) {
+        Arrays.sort(array);
+        int max = array[array.length-1];
+        for(int i : array) {
+            if (i == max)    { continue;  }
+            if (i * 2 > max) { return -1; };
+        }
+
+        return 1;
+    }
+}