diff --git a/COMPRESSION/Assembly.java b/COMPRESSION/Assembly.java
new file mode 100644
index 0000000..26c9734
--- /dev/null
+++ b/COMPRESSION/Assembly.java
@@ -0,0 +1,287 @@
+import java.io.IOException;
+import java.util.*;
+
+public class Assembly {
+
+    public static int notMapped;
+    public static int notMappedSize;
+    public static int ranSd = 0;
+
+    public static int getTotalContigSize(List<String> list) {
+        int total = 0;
+        for (String string : list) {
+            total += string.length();
+        }
+        return total;
+    }
+
+    public static HashMap greedyScoringScheme(String opFileName,
+                                              String contigsFileName, String pattern, double probability,
+                                              double elongation) throws IOException {
+        HashMap hashMap = new HashMap();
+        List<String> contigsList = Utilities.readContigs(contigsFileName);
+        int totalLength = getTotalContigSize(contigsList);
+
+        System.out.println("REAL_CONTIGS: " + contigsList.size());
+        System.out.println("TOTAL_LENGTH: " + totalLength);
+
+        List<Double> opList = Utilities.readOpMap(opFileName);
+
+        List<Contig> contigs = getMappedContigs(contigsList, pattern, probability, elongation);
+        contigsList.clear();
+
+        System.out.println("MAPPED_CONTIGS: " + contigs.size());
+
+        int best = 0;
+        int prev_list_size = 0;
+        boolean passed = false;
+
+        for (int i = 0; i < contigs.size(); i++) {
+
+            double min = Double.MAX_VALUE;
+
+            int slide = best;
+
+            if (i % 50 == 0) {
+                System.out.println("COMPLETED: " + i);
+            }
+
+            Contig contig = contigs.get(i);
+            List<Double> conFragList = contig.getFragmentSizeList();
+
+            int add = 0;
+            int begin = slide + prev_list_size / 2;
+            int end = begin + 3 * conFragList.size();
+
+            if (i > 0 && !passed) {
+                begin = 0;
+                end = opList.size() - conFragList.size() + 1;
+            }
+
+            passed = false;
+
+            if (end > opList.size() - conFragList.size() + 1) {
+                end = opList.size() - conFragList.size() + 1;
+            }
+
+            for (int k = begin; k < end; k++) {
+
+                int textPos = k + 1;
+                int patternPos = 1;
+                int missedRS = 1;
+                int test = 0;
+                double conFragSize = 0.0;
+                double opFragSize = 0.0;
+                double scoreOpt = 0.0;
+                double scoreCon = 0.0;
+
+                while (true) {
+                    if (add == 1) {
+                        conFragSize += conFragList.get(patternPos);
+                    } else if (add == 0) {
+                        conFragSize = conFragList.get(patternPos);
+                        opFragSize = opList.get(textPos);
+                    } else if (add == 2) {
+                        opFragSize += opList.get(textPos);
+                    }
+                    double sd = conFragList.get(patternPos) * (double) ranSd / 100;
+                    double lowerBound = opFragSize - sd;
+                    double upperBound = opFragSize + sd;
+
+                    if (conFragSize >= lowerBound && conFragSize <= upperBound) {
+                        patternPos = patternPos + 1;
+                        textPos = textPos + 1;
+                        add = 0;
+                    } else if (conFragSize < lowerBound) {
+                        patternPos = patternPos + 1;
+                        missedRS = missedRS + 1;
+                        test++;
+                        add = 1;
+                    } else if (conFragSize > upperBound) {
+                        missedRS = missedRS + 1;
+                        textPos = textPos + 1;
+                        add = 2;
+                    }
+
+                    if (test > conFragList.size()) break;
+
+                    if (patternPos >= conFragList.size() || textPos >= opList.size()) {
+
+                        Contig new_contig = new Contig();
+                        new_contig.setContigId(contig.getContigId());
+                        new_contig.setStartingPosition(Utilities.position_list.get(k));
+
+                        if (add == 0) {
+                            textPos = textPos - 1;
+                            new_contig.setEndingPosition(textPos);
+                        } else {
+                            new_contig.setEndingPosition(textPos);
+                        }
+
+                        for (int index = k; index < textPos; index++) {
+                            scoreOpt += Math.pow(opList.get(index), 1);
+                        }
+
+                        for (int index = 0; index < patternPos; index++) {
+                            scoreCon += Math.pow(conFragList.get(index), 1);
+                        }
+
+                        double matchedScore = Math.abs(scoreCon - scoreOpt) + 9999 * missedRS;
+
+                        new_contig.setMatchedScore(matchedScore);
+
+                        if (min >= matchedScore) {
+                            min = matchedScore;
+                            best = k;
+                        }
+
+                        List<Contig> list = (List<Contig>) hashMap.get(contig.getContigId());
+
+                        if (list == null) {
+                            list = new ArrayList<Contig>();
+                            list.add(new_contig);
+                            hashMap.put(contig.getContigId(), list);
+                            passed = true;
+                        } else {
+                            list.add(new_contig);
+                            hashMap.put(contig.getContigId(), list);
+                        }
+                        break;
+                    }
+                }
+            }
+
+            if (!passed) {
+                System.out.println("NOT_PASSED: " + i);
+                System.exit(0);
+                i = i - 1;
+            }
+            prev_list_size = conFragList.size();
+        }
+        return hashMap;
+    }
+
+    public static List<Contig> getMappedContigs(List<String> contigsList, String pattern,
+                                                double probability, double elongation) throws IOException {
+        int counter = 0;
+        List<Contig> list = new ArrayList<Contig>();
+        Utilities.restList = new ArrayList<Contig>();
+
+        for (String string : contigsList) {
+            List<Double> orderedFragmentSizeList = Utilities.getFragmentSizeList(string, pattern, probability, elongation);
+
+            if (orderedFragmentSizeList != null && orderedFragmentSizeList.size() > 0) {
+
+                Contig contig = new Contig();
+                contig.setContigId(counter);
+                contig.setFragmentSizeList(orderedFragmentSizeList);
+                list.add(contig);
+            } else {
+                notMapped++;
+                notMappedSize += string.length();
+            }
+            counter++;
+        }
+        return list;
+    }
+
+    public static List<Contig> getSortedList(List<Contig> list) {
+        List<Contig> sortedList = new ArrayList<Contig>();
+
+        Contig[] values = new Contig[list.size()];
+        int index = 0;
+        for (Contig contig : list) {
+            values[index] = contig;
+            index++;
+        }
+
+        Arrays.sort(values);
+        for (int i = 0; i < list.size(); i++) {
+            sortedList.add(values[i]);
+        }
+        return sortedList;
+    }
+
+    public static List<Contig> greedyScheduleScheme(String opFileName,
+                                                    String conFileName, String pattern, int depth,
+                                                    double probability, double elongation) throws IOException {
+        List<Contig> usedContigs = new ArrayList<Contig>();
+
+        HashMap hashMap = greedyScoringScheme(opFileName, conFileName, pattern, probability, elongation);
+
+        System.out.println("HASH_MAP_SIZE: " + hashMap.size());
+
+        Set set = hashMap.entrySet();
+        Iterator iterator = set.iterator();
+
+        while (iterator.hasNext()) {
+
+            Map.Entry me = (Map.Entry) iterator.next();
+            List<Contig> list = (List<Contig>) me.getValue();
+            List<Contig> sortedList = getSortedList(list);
+
+            Contig contig = getNextContig(sortedList, usedContigs, depth);
+
+            if (contig != null) {
+                usedContigs.add(contig);
+            }
+
+            //usedContigs.add(sortedList.get(0));
+            list.clear();
+        }
+
+        hashMap.clear();
+
+        return usedContigs;
+    }
+
+    public static boolean isOverlapped(List<Contig> contigs, Contig contig) {
+        for (Contig con : contigs) {
+            int startingPosition = con.getStartingPosition();
+            int endPosition = con.getEndingPosition();
+            if (contig.getStartingPosition() >= startingPosition && contig.getStartingPosition() <= endPosition) {
+                return true;
+            } else if (contig.getEndingPosition() >= startingPosition && contig.getEndingPosition() <= endPosition) {
+                return true;
+            } else if (contig.getStartingPosition() <= startingPosition && contig.getEndingPosition() >= endPosition) {
+                return true;
+            } else if (contig.getStartingPosition() <= startingPosition &&
+                    (contig.getEndingPosition() >= startingPosition && contig.getEndingPosition() <= endPosition)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static Contig getNextContig(List<Contig> sortedList, List<Contig> usedContigs, int depth) {
+        for (int i = 0; i < sortedList.size(); i++) {
+            Contig contig = sortedList.get(i);
+            boolean overlapped = isOverlapped(usedContigs, contig);
+            if (!overlapped) {
+                return contig;
+            }
+
+            if (i >= depth) break;
+        }
+        return null;
+    }
+
+    public static String getRandomPattern(int size) {
+        String pattern = "";
+        Random rand = new Random();
+        for (int i = 0; i < size; i++) {
+            int randomNumber = rand.nextInt(4);
+            if (randomNumber == 0) {
+                pattern += "a";
+            } else if (randomNumber == 1) {
+                pattern += "g";
+            } else if (randomNumber == 2) {
+                pattern += "c";
+            } else if (randomNumber == 3) {
+                pattern += "t";
+            }
+        }
+        return pattern;
+    }
+
+}