feb 2015 problem 1 / 3 / 4

uil/aplus-february-2015/1/Automaton.MD

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+# Automaton
+
+Run my solution on **[repl.it](https://repl.it/@Xevion/A-Computer-Science-February-2015-Automaton)!**
+
+A rather simple problem, despite the overwhelming complicated background information to understand what it's talking about in the first paragraph.
+
+I recommend skipping the first paragraph, and simply looking at the second one very carefully. In short, the entire problem is basically Regex.
+
+All you have to do is manipulate the input data, create a function for matching, loop until you find a input that works, and you're done.
+
+There was one big problem though I encountered, one that would have been a failed submission in the end.

uil/aplus-february-2015/1/Automaton.java

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+import static java.lang.System.out;
+import java.util.Scanner;
+import java.io.File;
+import java.io.IOException;
+
+class Automaton {
+    private String match;
+    private String input;
+
+    public Automaton(String match, String input) {
+        match = String.format("^%s$", match);
+        this.match = match.replace('U', '|'); 
+        this.input = input;
+    }
+
+    public String search() {
+        String cInput = this.input;
+        while(cInput.length() > 0) {
+            // out.println(String.format("%s %s", match, cInput));
+            if(cInput.matches(this.match))
+                if(cInput.length() == this.input.length())
+                    return "YES";
+                else
+                    return String.format("NO %s", cInput.length());
+            cInput = cInput.substring(0, cInput.length() - 1);
+        }
+        return "NO 0";
+    }
+}
+
+class Main {
+  public static void main(String[] args) throws IOException {
+      Scanner s = new Scanner(new File("automaton.dat"));
+      while(s.hasNextLine()) {
+          Automaton fsa = new Automaton(s.next(), s.next());
+          out.println(fsa.search());
+      }
+  }
+}