tasks a-s

Task/Semordnilap/Java/semordnilap.java

@@ -0,0 +1,30 @@
+import java.io.*;
+import java.util.*;
+
+public class Semordnilaps {
+
+    public static void main(String[] args) throws IOException {
+        List<String> lst = readLines("unixdict.txt");
+        Set<String> seen = new HashSet<>();
+        int count = 0;
+        for (String w : lst) {
+            String r = new StringBuilder(w).reverse().toString();
+            if (seen.contains(r)) {
+                if (count++ < 5)
+                    System.out.printf("%-10s %-10s\n", w, r);
+            } else seen.add(w);
+        }
+        System.out.println("\nSemordnilap pairs found: " + count);
+    }
+
+    private static List<String> readLines(String fn) throws IOException {
+        List<String> lines;
+        try (BufferedReader br = new BufferedReader(new FileReader(fn))) {
+            lines = new ArrayList<>();
+            String line;
+            while ((line = br.readLine()) != null)
+                lines.add(line.trim().toLowerCase());
+        }
+        return lines;
+    }
+}