راهنمایی درمورد اجرای یک کد

سلام من میخوام این کد اجرا بشه ولی ارور میده


run:
Error: Could not find or load main class suffixtree.SuffixTree
C:\Users\4ough\AppData\Local\NetBeans\Cache\8.2\ex ecutor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)




.لطفا رراهنماییم بکنین که چه طور اجراش کنم؟

import java.util.Random;



public class SuffixTree {

  static final String ALPHABET = "abcdefghijklmnopqrstuvwxyz0123456789\1\2";



  public static class Node {

    int begin;

    int end;

    int depth; // distance in characters from root to this node

    Node parent;

    Node[] children;

    Node suffixLink;



    Node(int begin, int end, int depth, Node parent) {

      this.begin = begin;

      this.end = end;

      this.parent = parent;

      this.depth = depth;

      children = new Node[ALPHABET.length()];

    }

  }



  public static Node buildSuffixTree(CharSequence s) {

    int n = s.length();

    byte[] a = new byte[n];

    for (int i = 0; i < n; i++) a[i] = (byte) ALPHABET.indexOf(s.charAt(i));

    Node root = new Node(0, 0, 0, null);

    Node node = root;

    for (int i = 0, tail = 0; i < n; i++, tail++) {

      Node last = null;

      while (tail >= 0) {

        Node ch = node.children[a[i - tail]];

        while (ch != null && tail >= ch.end - ch.begin) {

          tail -= ch.end - ch.begin;

          node = ch;

          ch = ch.children[a[i - tail]];

        }

        if (ch == null) {

          node.children[a[i]] = new Node(i, n, node.depth + node.end - node.begin, node);

          if (last != null) last.suffixLink = node;

          last = null;

        } else {

          byte t = a[ch.begin + tail];

          if (t == a[i]) {

            if (last != null) last.suffixLink = node;

            break;

          } else {

            Node splitNode = new Node(ch.begin, ch.begin + tail, node.depth + node.end - node.begin, node);

            splitNode.children[a[i]] = new Node(i, n, ch.depth + tail, splitNode);

            splitNode.children[t] = ch;

            ch.begin += tail;

            ch.depth += tail;

            ch.parent = splitNode;

            node.children[a[i - tail]] = splitNode;

            if (last != null) last.suffixLink = splitNode;

            last = splitNode;

          }

        }

        if (node == root) {

          --tail;

        } else {

          node = node.suffixLink;

        }

      }

    }

    return root;

  }



  // random test

  public static void main(String[] args) {

    Random rnd = new Random(1);

    for (int step = 0; step < 100_000; step++) {

      int n1 = rnd.nextInt(10);

      int n2 = rnd.nextInt(10);

      String s1 = getRandomString(n1, rnd);

      String s2 = getRandomString(n2, rnd);

      // build generalized suffix tree

      String s = s1 + '\1' + s2 + '\2';

      Node tree = buildSuffixTree(s);

      lcsLength = 0;

      lcsBeginIndex = 0;

      // find longest common substring

      lcs(tree, s1.length(), s1.length() + s2.length() + 1);

      int res2 = slowLcs(s1, s2);

      if (lcsLength != res2) {

        System.err.println(s.substring(lcsBeginIndex - 1, lcsBeginIndex + lcsLength - 1));

        System.err.println(s1);

        System.err.println(s2);

        System.err.println(lcsLength + " " + res2);

        throw new RuntimeException();

      }

    }

  }



  static int lcsLength;

  static int lcsBeginIndex;



  // traverse suffix tree to find longest common substring

  public static int lcs(Node node, int i1, int i2) {

    if (node.begin <= i1 && i1 < node.end) {

      return 1;

    }

    if (node.begin <= i2 && i2 < node.end) {

      return 2;

    }

    int mask = 0;

    for (char f = 0; f < ALPHABET.length(); f++) {

      if (node.children[f] != null) {

        mask |= lcs(node.children[f], i1, i2);

      }

    }

    if (mask == 3) {

      int curLength = node.depth + node.end - node.begin;

      if (lcsLength < curLength) {

        lcsLength = curLength;

        lcsBeginIndex = node.begin;

      }

    }

    return mask;

  }



  static int slowLcs(String a, String b) {

    int[][] lcs = new int[a.length()][b.length()];

    int res = 0;

    for (int i = 0; i < a.length(); i++) {

      for (int j = 0; j < b.length(); j++) {

        if (a.charAt(i) == b.charAt(j))

          lcs[i][j] = 1 + (i > 0 && j > 0 ? lcs[i - 1][j - 1] : 0);

        res = Math.max(res, lcs[i][j]);

      }

    }

    return res;

  }



  static String getRandomString(int n, Random rnd) {

    StringBuilder sb = new StringBuilder();

    for (int i = 0; i < n; i++) {

      sb.append((char) ('a' + rnd.nextInt(3)));

    }

    return sb.toString();

  }

}

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