Merge branch 'powersort_M'

# Conflicts:
#	.idea/misc.xml

.idea/misc.xml

@@ -3,5 +3,5 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" project-jdk-name="openjdk-23" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" default="true" project-jdk-name="23" project-jdk-type="JavaSDK" />
 </project>

app/src/main/java/de/uni_marburg/powersort/msort/IMPL_M_1.java

@@ -0,0 +1,298 @@
+package de.uni_marburg.powersort.msort;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.IntStream;
+
+public class IMPL_M_1 {
+
+
+
+        private IMPL_M_1() {}
+
+        /**
+         * Sorts the given range, using the given workspace array slice
+         * for temp storage when possible. This method is designed to be
+         * invoked from public methods (in class Arrays) after performing
+         * any necessary array bounds checks and expanding parameters into
+         * the required forms.
+         *
+         * @param a        the array to be sorted
+         * @param lo       the index of the first element, inclusive, to be sorted
+         * @param hi       the index of the last element, exclusive, to be sorted
+         * @param c        the comparator to use
+         * @param work     a workspace array (slice)
+         * @param workBase origin of usable space in work array
+         * @param workLen  usable size of work array
+         * @since 1.8
+         */
+        protected static int MERGE_COST = 0;
+
+        // Example usage
+//        int[] runs = new int[] {5, 3, 3, 14, 1, 2}; // example from slides
+//        //runs = new int[]{9, 16, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7};
+//
+//        ArrayList<Integer> a = new ArrayList<>(IntStream.range(0, Arrays.stream(runs).sum()).boxed().collect(Collectors.toList()));
+//
+//        System.out.println();
+//        fillWithAscRunsHighToLow(a, runs);
+//        MERGE_COST = 0;
+//        System.out.println("Sorting with Powersort:");
+//        powersort(a, this::extendRunIncreasingOnly);
+//        System.out.println("Merge cost: " + MERGE_COST);
+
+//        runs = [5,3,3,14,1,2];
+//        runs = [9,16,7,7,7,7,7,7,7,7,7,7];
+//
+//        a = list(range(sum(runs)));
+//        fill_with_asc_runs_high_to_low(a, runs);
+//        MERGE_COST = 0;
+//        System.out.println("Sorting with Powersort:");
+//        powersort(a, extendRunIncreasingOnly);
+//        System.out.println("Merge cost: " + MERGE_COST);
+
+
+        public static void fillWithAscRunsHighToLow(List<Integer> A, int[] runLengths, int runLenFactor) {
+            int n = A.size();
+            assert IntStream.of(runLengths).sum() * runLenFactor == n;
+
+            for (int i = 0; i < n; i++) {
+                A.set(i, n - i);
+            }
+
+            int i = 0;
+            for (int l : runLengths) {
+                int L = l * runLenFactor;
+                List<Integer> sublist = A.subList(i, i + L);
+                Collections.sort(sublist);
+                i += L;
+            }
+        }
+
+        private static List<Integer> merge(List<Integer> run1, List<Integer> run2) {
+            List<Integer> result = new ArrayList<>();
+            while (!run1.isEmpty() && !run2.isEmpty()) {
+                if (run1.get(0) < run2.get(0)) {
+                    result.add(run1.remove(0));
+                } else {
+                    result.add(run2.remove(0));
+                }
+            }
+            result.addAll(run1);
+            result.addAll(run2);
+            return result;
+        }
+
+        private static void mergeInplace(List<Integer> a, int i, int m, int j) {
+            System.out.printf("Merge(%d, %d, %d)%n", i, m, j);
+            MERGE_COST += j - i;
+            List<Integer> sublist = merge(
+                    new ArrayList<>(a.subList(i, m)),
+                    new ArrayList<>(a.subList(m, j))
+            );
+            for (int k = 0; k < sublist.size(); k++) {
+                a.set(i + k, sublist.get(k));
+            }
+        }
+
+        static int extendRun(List<Integer> a, int i) {
+            if (i == a.size() - 1) {
+                return i + 1;
+            }
+            int j = i + 1;
+            if (a.get(i) <= a.get(j)) {
+                while (j < a.size() && a.get(j - 1) <= a.get(j)) {
+                    j++;
+                }
+            } else {
+                while (j < a.size() && a.get(j - 1) > a.get(j)) {
+                    j++;
+                }
+                List<Integer> sublist = a.subList(i, j);
+                Collections.reverse(sublist);
+            }
+            return j;
+        }
+
+        private static int extendRunIncreasingOnly(List<Integer> a, int i) {
+            if (i == a.size() - 1) {
+                return i + 1;
+            }
+            int j = i + 1;
+            while (j < a.size() && a.get(j - 1) <= a.get(j)) {
+                j++;
+            }
+            return j;
+        }
+
+        public static int power(int[] run1, int[] run2, int n) {
+            int i1 = run1[0], n1 = run1[1];
+            int i2 = run2[0], n2 = run2[1];
+
+            assert i1 >= 0;
+            assert i2 == i1 + n1;
+            assert n1 >= 1 && n2 >= 1;
+            assert i2 + n2 <= n;
+
+            double a =  ((i1 + n1 / 2.0d) / n);
+            double b = ((i2 + n2 / 2.0d) / n);
+
+            int l = 0;
+            while (Math.floor(a * Math.pow(2, l)) == Math.floor(b * Math.pow(2, l))) {
+                l++;
+            }
+            return l;
+        }
+
+        public static int powerFast(int[] run1, int[] run2, int n) {
+            int i1 = run1[0], n1 = run1[1];
+            int i2 = run2[0], n2 = run2[1];
+
+            int a = 2 * i1 + n1;
+            int b = a + n1 + n2;
+
+            int l = 0;
+            while (true) {
+                l++;
+                if (a >= n) {
+                    assert b >= a;
+                    a -= n;
+                    b -= n;
+                } else if (b >= n) {
+                    break;
+                }
+                assert a < b && b < n;
+                a <<= 1;
+                b <<= 1;
+            }
+            return l;
+        }
+
+        public static void mergeTopmost2(List<Integer> a, List<int[]> runs) {
+            assert runs.size() >= 2;
+
+            int[] Y = runs.get(runs.size() - 2);
+            int[] Z = runs.get(runs.size() - 1);
+
+            assert Z[0] == Y[0] + Y[1];
+
+            mergeInplace(a, Y[0], Z[0], Z[0] + Z[1]);
+
+            runs.set(runs.size() - 2, new int[] {Y[0], Y[1] + Z[1], Y[2]});
+            runs.remove(runs.size() - 1);
+        }
+
+        public static void powerSort(List<Integer> a) {
+            int n = a.size();
+            int i = 0;
+            List<int[]> runs = new ArrayList<>();
+
+            int j = extendRun(a, i);
+            runs.add(new int[] {i, j - i, 0});
+            i = j;
+
+            while (i < n) {
+                j = extendRun(a, i);
+                int p = power(runs.get(runs.size() - 1), new int[] {i, j - i}, n);
+
+                while (p <= runs.get(runs.size() - 1)[2]) {
+                    mergeTopmost2(a, runs);
+                }
+
+                runs.add(new int[] {i, j - i, p});
+                i = j;
+            }
+
+            while (runs.size() >= 2) {
+                mergeTopmost2(a, runs);
+            }
+        }
+
+       /* """Fills the given array A with ascending runs of the given list of run
+    lengths.
+    More precisely, the array is first filled n, n-1, ..., 1
+    and then for i=0..l-1 segments of runLengths.get(i) * runLenFactor
+    are sorted ascending.
+    The sum of all lengths in runLengths times runLenFactor should be equal to the
+    length of A.
+    """*/
+
+
+  /*  static <T> void sort(T[] a, int lo, int hi, Comparator<? super T> c,
+                         T[] work, int workBase, int workLen) {
+        assert c != null && a != null && lo >= 0 && lo <= hi && hi <= a.length;
+    }*/
+/*
+    public static final int MIN_MERGE=24;
+    public int mergeCost=0;
+    private final T []sortedArray;
+
+    public PowerSort(T[] sortedArray) {
+        super();
+        this.sortedArray = sortedArray;
+    }
+
+    ArrayList<Integer> run1 = new ArrayList<>();
+    ArrayList<Integer> run2 = new ArrayList<>();
+
+    private AbstractList<Integer> merge(ArrayList <Integer> run1, ArrayList<Integer> run2) {
+       ArrayList<Integer> result = new ArrayList<>();
+
+        while(run1.size() > 0 && run2.size() >0) {
+            if (run1.getFirst()<run2.getFirst()){
+                result.add(run1.getFirst());
+                run1.removeFirst();
+            }else {
+                result.add(run2.getFirst());
+                run2.removeFirst();
+            }
+            result.addAll(run1);
+            result.addAll(run2);
+        }
+        return result;
+    }
+
+    public void mergeInplace(int[] a, int[] i, int[] m, int[] j) {
+        //System.out.println("merge(" + i + "," + m + "," + j + ")");
+
+            System.out.printf("Merge(%d, %d, %d)%n", i, m, j);
+      //    this.mergeCost += j - i;
+
+
+        for(int s =0; s < i.length && s< j.length ; s++) {
+
+
+//            int[] leftSubarray = copyOfRange(a, i, m);
+//            int[] rightSubarray = copyOfRange(a, m, j);
+//            int[] mergedSubarray = merge(leftSubarray, rightSubarray);
+//            System.arraycopy(mergedSubarray, 0, a, i, mergedSubarray.length);
+////            mergeCost += j[s] - i[s];
+//            System.arraycopy(merge(Arrays.copyOfRange(a, i, m), Arrays.copyOfRange(a, m, j)), 0, a, i, j - i);
+//            a[i:j]=merge(a[i:m],a[m:j]);
+        }
+
+    }
+
+
+
+    public void power(int run1,int run2, int n) {
+        int i = run1;
+        int n1 = run1;
+        int j = run2;
+        int n2 = run2;
+        int a=(i + n1/2) / n;
+        int b=(j + n2/2) / n;
+        int l =0;
+        //while( Math.floor(a * 2**1)){
+       //     Math.floor(b * );
+      //  }
+
+    }
+
+    public void sorting(final int[] Array, final int left, final int right) {
+
+
+    }*/
+
+}

app/src/test/java/de/uni_marburg/powersort/msort/PowerSortTest.java

@@ -0,0 +1,37 @@
+package de.uni_marburg.powersort.msort;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import org.junit.jupiter.api.Test;
+
+import static de.uni_marburg.powersort.msort.IMPL_M_1.MERGE_COST;
+import static de.uni_marburg.powersort.msort.IMPL_M_1.extendRun;
+import static de.uni_marburg.powersort.msort.IMPL_M_1.fillWithAscRunsHighToLow;
+import static de.uni_marburg.powersort.msort.IMPL_M_1.powerSort;
+
+class PowerSortTest {
+    @Test
+
+    public void testWithOneInputList() {
+        List<Integer> list = new ArrayList<>(List.of(5, 2, 8, 12, 1, 6));
+        extendRun(list, 0);
+        System.out.println(list);
+        // example from slides he wrote this
+        int[] runs = {5, 3, 3, 14, 1, 2};
+        // runs = new int[]{9, 16, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7};
+
+        List<Integer> a = new ArrayList<>(IntStream.range(0, Arrays.stream(runs).sum()).boxed().collect(Collectors.toList()));
+
+        System.out.println();
+        fillWithAscRunsHighToLow(a, runs, 1);
+        MERGE_COST = 0;
+        System.out.println("Sorting with Powersort:");
+        powerSort(a);
+        System.out.println("Merge cost: " + MERGE_COST);
+    }
+
+    }