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Merged
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Oct 7, 2019
Merged

mergeSortedArrayList #982

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60 changes: 60 additions & 0 deletions DataStructures/Lists/MergeSortedArrayList.java
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Original file line number Diff line number Diff line change
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package DataStructures.Lists;

import java.util.ArrayList;
import java.util.List;

/**
* @author https://github.com/shellhub
*/

public class MergeSortedArrayList {
public static void main(String[] args) {
List<Integer> listA = new ArrayList<>();
List<Integer> listB = new ArrayList<>();
List<Integer> listC = new ArrayList<>();

/* init ListA and List B */
for (int i = 1; i <= 10; i += 2) {
listA.add(i); /* listA: [1, 3, 5, 7, 9] */
listB.add(i + 1); /* listB: [2, 4, 6, 8, 10] */
}

/* merge listA and listB to listC */
merge(listA, listB, listC);

System.out.println("listA: " + listA);
System.out.println("listB: " + listB);
System.out.println("listC: " + listC);
}

/**
* merge two sorted ArrayList
*
* @param listA the first list to merge
* @param listB the second list to merge
* @param listC the result list after merging
*/
public static void merge(List<Integer> listA, List<Integer> listB, List<Integer> listC) {
int pa = 0; /* the index of listA */
int pb = 0; /* the index of listB */

while (pa < listA.size() && pb < listB.size()) {
if (listA.get(pa) <= listB.get(pb)) {
listC.add(listA.get(pa++));
} else {
listC.add(listB.get(pb++));
}
}

/* copy left element of listA to listC */
while (pa < listA.size()) {
listC.add(listA.get(pa++));
}

/* copy left element of listB to listC */
while (pb < listB.size()) {
listC.add(listB.get(pb++));
}
}

}