amazon review score

src/main/java/aws/AmazonReviewScore.java

@@ -0,0 +1,82 @@
+package aws;
+
+public class AmazonReviewScore {
+
+    private class Trie {
+        Trie[] alpha = new Trie[26];
+        boolean leaf;
+    }
+
+    public int amazonReviewScore(String review, String[] prohibitedWords) {
+
+        final Trie root = new Trie();
+        for (String prohibitedWord : prohibitedWords) {
+
+            insert(root, prohibitedWord);
+        }
+
+        int max = 0;
+        for (int i = 0; i < review.length(); i++) {
+
+            int count = 0;
+            Trie child = root;
+            for (int j = i; j < review.length(); j++) {
+
+                int rep = review.toUpperCase().charAt(j) - 'A';
+                if (child.alpha[rep] != null) {
+
+                    child = child.alpha[rep];
+
+                    if (child.leaf) {
+                        max = Math.max(count, max);
+                        break;
+                    } else {
+                        count += 1;
+                    }
+
+                } else {
+                    child = root;
+                    if (child.alpha[rep] != null) {
+                        // copy paste logic above
+                        child = child.alpha[rep];
+
+                        if (child.leaf) {
+                            max = Math.max(count, max);
+                            break;
+                        } else {
+                            count += 1;
+                        }
+                        //
+                    } else {
+                        count += 1;
+                    }
+                }
+                max = Math.max(count, max);
+            }
+        }
+
+        return max;
+    }
+
+    private Trie insert(Trie root, String key) {
+
+        Trie child = root;
+
+        for (int i = 0; i < key.length(); i++) {
+
+            int l = key.toUpperCase().charAt(i) - 'A';
+
+            if (child.alpha[l] == null) {
+                child.alpha[l] = new Trie();
+                child = child.alpha[l];
+            } else {
+                child = child.alpha[l];
+            }
+        }
+        child.leaf = true;
+
+        return root;
+    }
+
+
+}

src/test/java/aws/AmazonReviewScoreTest.java

@@ -0,0 +1,17 @@
+package aws;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class AmazonReviewScoreTest {
+
+    @Test
+    public void test() {
+        AmazonReviewScore amazonReviewScore = new AmazonReviewScore();
+
+        Assertions.assertEquals(15, amazonReviewScore.amazonReviewScore("GoodProductButScrapAfterWash", new String[]{"crap", "odpro"}));
+        Assertions.assertEquals(11, amazonReviewScore.amazonReviewScore("FastDeliveryOkayProduct", new String[]{"eryoka", "yo", "eli"}));
+        Assertions.assertEquals(20, amazonReviewScore.amazonReviewScore("ExtremeValueForMoney", new String[]{"tuper", "douche"}));
+    }
+
+}