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0086-partition-list.java

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class Solution {

public ListNode partition(ListNode head, int x) {

ListNode head1 = new ListNode(); // will store node.value < x

ListNode head2 = new ListNode(); // will store node.value >= x

ListNode tail1 = head1, tail2 = head2, curr = head;

while (curr != null) {

if (curr.val < x) {

tail1.next = curr;

tail1 = tail1.next;

} else {

tail2.next = curr;

tail2 = tail2.next;

}

curr = curr.next;

}

// at this point the two lists are not connected the way we want them to

// we'll need to connect the list with values<x to list with values >= x

// also the last node (tail2) is currently pointing to some random node but it

// should point to null

tail1.next = head2.next;

tail2.next = null;

return head1.next;

}

}