MrGeorgen/timsort
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split array in runs

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MrGeorgen
2020-12-26 19:11:37 +01:00
parent 1c607dde99
commit a06dd33ca8
2 changed files with 34 additions and 4 deletions
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5
src/main/java/de/redstoneunion/git/MrGeorgen/timsort/test.java
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@ -6,8 +6,9 @@ import de.redstoneunion.git.MrGeorgen.timsort.timsort;
public class test { public class test {
public static void main(String[] args) { public static void main(String[] args) {
int[] array = {0, 3, -1, -3, -6, -6, 10, 10, 789, 456}; int[] array = {0, 3, 4, 8, -6, -6, 10, 10, 789, 456, 0, -1, -2, 8, 10};
int[] output = timsort.insertionsort(array); int[] output = timsort.insertionsort(array);
System.out.println(Arrays.toString(output)); //System.out.println(Arrays.toString(output));
timsort.timsort(array);
} }
} }

33
src/main/java/de/redstoneunion/git/MrGeorgen/timsort/timsort.java
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@ -1,5 +1,8 @@
package de.redstoneunion.git.MrGeorgen.timsort; package de.redstoneunion.git.MrGeorgen.timsort;
import java.util.ArrayList;
import java.util.Arrays;
public class timsort { public class timsort {
public static int[] insertionsort(int[] unsorted) { public static int[] insertionsort(int[] unsorted) {
int[] output = new int[unsorted.length]; int[] output = new int[unsorted.length];
@ -8,7 +11,6 @@ public class timsort {
int minIndex = 0; int minIndex = 0;
int maxIndex = i; int maxIndex = i;
for(int j = maxIndex - 1; minIndex != maxIndex; j = minIndex + (maxIndex - minIndex) / 2) { for(int j = maxIndex - 1; minIndex != maxIndex; j = minIndex + (maxIndex - minIndex) / 2) {
System.out.println("min: " + minIndex + " max: " + maxIndex);
if(unsorted[i] >= output[j]) { if(unsorted[i] >= output[j]) {
minIndex = j + 1; minIndex = j + 1;
} }
@ -16,7 +18,6 @@ public class timsort {
maxIndex = j; maxIndex = j;
} }
} }
System.out.println(unsorted[i] + ":" + minIndex);
for(int j = i; j > minIndex; --j) { for(int j = i; j > minIndex; --j) {
output[j] = output[j - 1]; output[j] = output[j - 1];
} }
@ -24,4 +25,32 @@ public class timsort {
} }
return output; return output;
} }
public static int[] timsort(int[] unsorted) {
int r = 0;
// r becomes 1 any 1 bits are shifted off
int n = 16;
while(n >= 64) {
r |= (n & 1);
n >>= 1;
}
int minRun = n + r;
ArrayList<int[]> runs = new ArrayList<int[]>();
for(int i = 0; i < unsorted.length - 1;) {
int j = i;
boolean ascending = true;
boolean descending = true;
for(; i < unsorted.length - 1 && (ascending || descending); ++i) {
ascending = ascending && unsorted[i] <= unsorted[i + 1];
descending = descending && unsorted[i] >= unsorted[i + 1];
}
if(i - j < minRun) i = j + minRun;
if(i >= unsorted.length - 1) i = unsorted.length;
runs.add(Arrays.copyOfRange(unsorted, j, i));
}
int[][] notMerged= new int[runs.size()][];
for(int i = 0; i < runs.size(); ++i) {
notMerged[i] = insertionsort(runs.get(i));
}
return new int[1];
}
} }