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Commitead43b8

Browse files
author
pony
committed
Add remove-linked-list-elements solution
1 parente372329 commitead43b8

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2 files changed

+199
-0
lines changed

2 files changed

+199
-0
lines changed
Lines changed: 84 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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<?php
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declare(strict_types=1);
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namespaceleetcode;
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useleetcode\util\ListNode;
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class RemoveLinkedListElements
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{
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publicstaticfunctionremoveElements(?ListNode$head,int$val): ?ListNode
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{
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if (!$head) {
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returnnull;
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}
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$next =self::removeElements($head->next,$val);
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if ($head->val ===$val) {
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return$next;
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}
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$head->next =$next;
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return$head;
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}
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publicstaticfunctionremoveElements2(?ListNode$head,int$val): ?ListNode
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{
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if (!$head) {
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returnnull;
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}
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[$prev,$curr] = [null,$head];
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while ($curr) {
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if ($curr->val ===$val) {
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if ($curr ===$head) {
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$curr =$head =$head->next;
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}else {
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$prev->next =$curr->next;
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$curr =$curr->next;
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}
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}else {
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$prev =$curr;
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$curr =$curr->next;
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}
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}
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return$head;
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}
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publicstaticfunctionremoveElements3(?ListNode$head,int$val): ?ListNode
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{
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if (!$head) {
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returnnull;
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}
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$dummy =newListNode();
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$dummy->next =$head;
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[$prev,$curr] = [$dummy,$head];
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while ($curr) {
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if ($curr->val ===$val) {
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$prev->next =$curr->next;
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}else {
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$prev =$prev->next;
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}
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$curr =$curr->next;
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}
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return$dummy->next;
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}
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publicstaticfunctionremoveElements4(?ListNode$head,int$val): ?ListNode
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{
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if (!$head) {
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returnnull;
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}
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$curr =$head;
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while ($curr->next) {
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if ($curr->next->val ===$val) {
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$curr->next =$curr->next->next;
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}else {
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$curr =$curr->next;
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}
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}
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return$head->val ===$val ?$head->next :$head;
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}
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}
Lines changed: 115 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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<?php
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declare(strict_types=1);
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namespaceleetcode\tests;
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usePHPUnit\Framework\TestCase;
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useleetcode\RemoveLinkedListElements;
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useleetcode\util\ListNode;
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class RemoveLinkedListElementsTestextends TestCase
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{
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private ?ListNode$l1;
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private ?ListNode$l2;
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private ?ListNode$l3;
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private ?ListNode$l4;
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protectedfunctionsetUp():void
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{
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$this->l1 =newListNode(
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1,
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newListNode(
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2,
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newListNode(
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6,
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newListNode(
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3,
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newListNode(
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4,
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newListNode(
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5,
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newListNode(6)
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)
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)
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)
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)
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)
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);
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$this->l2 =null;
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$this->l3 =newListNode(
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7,
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newListNode(
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7,
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newListNode(
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7,
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newListNode(
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7,
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newListNode(7)
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)
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)
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)
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);
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$this->l4 =newListNode(9);
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}
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publicfunctiontestRemoveElements():void
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{
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$node1 = RemoveLinkedListElements::removeElements($this->l1,6);
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self::assertSame([1,2,3,4,5], ListNode::toArray($node1));
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$node2 = RemoveLinkedListElements::removeElements($this->l2,1);
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self::assertSame([], ListNode::toArray($node2));
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$node3 = RemoveLinkedListElements::removeElements($this->l3,7);
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self::assertSame([], ListNode::toArray($node3));
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$node4 = RemoveLinkedListElements::removeElements($this->l4,9);
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self::assertSame([], ListNode::toArray($node4));
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}
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publicfunctiontestRemoveElements2():void
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{
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$node1 = RemoveLinkedListElements::removeElements2($this->l1,6);
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self::assertSame([1,2,3,4,5], ListNode::toArray($node1));
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$node2 = RemoveLinkedListElements::removeElements2($this->l2,1);
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self::assertSame([], ListNode::toArray($node2));
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$node3 = RemoveLinkedListElements::removeElements2($this->l3,7);
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self::assertSame([], ListNode::toArray($node3));
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$node4 = RemoveLinkedListElements::removeElements2($this->l4,9);
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self::assertSame([], ListNode::toArray($node4));
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}
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publicfunctiontestRemoveElements3():void
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{
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$node1 = RemoveLinkedListElements::removeElements3($this->l1,6);
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self::assertSame([1,2,3,4,5], ListNode::toArray($node1));
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$node2 = RemoveLinkedListElements::removeElements3($this->l2,1);
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self::assertSame([], ListNode::toArray($node2));
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$node3 = RemoveLinkedListElements::removeElements3($this->l3,7);
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self::assertSame([], ListNode::toArray($node3));
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$node4 = RemoveLinkedListElements::removeElements3($this->l4,9);
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self::assertSame([], ListNode::toArray($node4));
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}
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publicfunctiontestRemoveElements4():void
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{
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$node1 = RemoveLinkedListElements::removeElements4($this->l1,6);
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self::assertSame([1,2,3,4,5], ListNode::toArray($node1));
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$node2 = RemoveLinkedListElements::removeElements4($this->l2,1);
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self::assertSame([], ListNode::toArray($node2));
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$node3 = RemoveLinkedListElements::removeElements4($this->l3,7);
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self::assertSame([], ListNode::toArray($node3));
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$node4 = RemoveLinkedListElements::removeElements4($this->l4,9);
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self::assertSame([], ListNode::toArray($node4));
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}
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}

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