添加(0203.移除链表元素.md):增加typescript版本

This commit is contained in:
Steve2020
2022-01-09 13:42:10 +08:00
parent cb0f5906fd
commit a246b9b4e6

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@ -302,7 +302,63 @@ var removeElements = function(head, val) {
};
```
TypeScript:
版本一(在原链表上直接删除):
```typescript
/**
* Definition for singly-linked list.
* class ListNode {
* val: number
* next: ListNode | null
* constructor(val?: number, next?: ListNode | null) {
* this.val = (val===undefined ? 0 : val)
* this.next = (next===undefined ? null : next)
* }
* }
*/
function removeElements(head: ListNode | null, val: number): ListNode | null {
// 删除头部节点
while (head !== null && head.val === val) {
head = head.next;
}
if (head === null) return head;
let pre: ListNode = head, cur: ListNode = head.next;
// 删除非头部节点
while (cur) {
if (cur.val === val) {
pre.next = cur.next;
} else {
pre = pre.next;
}
cur = cur.next;
}
return head;
};
```
版本二(虚拟头节点):
```typescript
function removeElements(head: ListNode | null, val: number): ListNode | null {
head = new ListNode(0, head);
let pre: ListNode = head, cur: ListNode = head.next;
// 删除非头部节点
while (cur) {
if (cur.val === val) {
pre.next = cur.next;
} else {
pre = pre.next;
}
cur = cur.next;
}
return head.next;
};
```
Swift
```swift
/**
* Definition for singly-linked list.