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SortList.java

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package Algorithms;

public class SortList {

public static void main(String[] str) {

SortList sl = new SortList();

ListNode head = new ListNode(1);

sl.sortList(head);

}

public ListNode sortList(ListNode head) {

if (head == null) {

return head;

}

ListNode mid = findMid(head);

ListNode right = sortList(mid.next);

mid.next = null;

ListNode left = sortList(head);

return merge(left, right);

}

private ListNode findMid(ListNode head) {

ListNode s = head;

ListNode f = head.next;

while (f != null && f.next != null) {

s = s.next;

f = f.next.next;

}

return s;

}

private ListNode merge(ListNode head1, ListNode head2) {

ListNode dummy = new ListNode(0);

ListNode tail = dummy;

while (head1 != null && head2 != null) {

if (head1.val < head2.val) {

tail.next = head1;

head1 = head1.next;

} else {

tail.next = head2;

head2 = head2.next;

}

tail = tail.next;

}

if (head1 != null) {

tail.next = head1;

} else {

tail.next = head2;

}

return dummy.next;

}

}