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添加py和js,添加注释
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@ -10,7 +10,7 @@
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今天给大家带来一个不是那么难的题目,这个题目的解答方法很多,只要能AC的就是好方法,虽然题目不是特别难但是也是剑指offer上的经典题目所以大家要记得打卡呀。
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然后今天我们的链表板块就算结束啦。周末的时候我会对链表的题目做一个总结,俗话说温故而知新嘛。好啦废话不多说,我们一起来看一下今天的题目吧
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然后今天我们的链表板块就算结束啦。周末的时候我会对链表的题目做一个总结,俗话说温故而知新嘛。好啦废话不多说,我们一起来看一下今天的题目吧!
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题目描述:
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@ -41,16 +41,19 @@ public class Solution {
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ListNode tempb = headB;
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//定义Hashset
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HashSet<ListNode> arr = new HashSet<ListNode>();
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//遍历链表A,将所有值都存到arr中
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while (tempa != null) {
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arr.add(tempa);
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tempa = tempa.next;
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}
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//遍历列表B,如果发现某个结点已在arr中则直接返回该节点
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while (tempb != null) {
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if (arr.contains(tempb)) {
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return tempb;
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}
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tempb = tempb.next;
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}
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//若上方没有返回,此刻tempb为null
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return tempb;
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}
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@ -67,21 +70,73 @@ public:
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ListNode * tempb = headB;
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//定义Hashset
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set <ListNode *> arr;
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//遍历链表A,将所有值都存到arr中
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while (tempa != nullptr) {
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arr.insert(tempa);
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tempa = tempa->next;
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}
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//遍历列表B,如果发现某个结点已在arr中则直接返回该节点
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while (tempb != nullptr) {
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if (arr.find(tempb) != arr.end()) {
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return tempb;
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}
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tempb = tempb->next;
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}
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//若上方没有返回,此刻tempb为null
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return tempb;
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}
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};
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```
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JS Code:
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```js
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var getIntersectionNode = function(headA, headB) {
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let tempa = headA;
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let tempb = headB;
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//定义Hashset
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let arr = new Set();
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//遍历链表A,将所有值都存到arr中
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while (tempa) {
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arr.add(tempa);
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tempa = tempa.next;
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}
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//遍历列表B,如果发现某个结点已在arr中则直接返回该节点
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while (tempb) {
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if (arr.has(tempb)) {
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return tempb;
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}
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tempb = tempb.next;
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}
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//若上方没有返回,此刻tempb为null
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return tempb;
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};
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```
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Python Code:
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```py
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class Solution:
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def getIntersectionNode(self, headA: ListNode, headB: ListNode) -> ListNode:
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tempa = headA
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tempb = headB
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# 定义Hashset
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arr = set()
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# 遍历链表A,将所有值都存到arr中
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while tempa is not None:
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arr.add(tempa)
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tempa = tempa.next
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# 遍历列表B,如果发现某个结点已在arr中则直接返回该节点
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while tempb is not None:
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if tempb in arr:
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return tempb
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tempb = tempb.next
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# 若上方没有返回,此刻tempb为null
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return tempb
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```
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下面这个方法比较巧妙,不是特别容易想到,大家可以自己实现一下,这个方法也是利用我们的双指针思想。
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下面我们直接看动图吧,特别直观,一下就可以搞懂。
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@ -108,7 +163,7 @@ public class Solution {
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tempa = tempa != null ? tempa.next: headB;
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tempb = tempb != null ? tempb.next: headA;
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}
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return tempa;
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return tempa;//返回tempb也行
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}
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}
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```
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@ -124,15 +179,48 @@ public:
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ListNode * tempb = headB;
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//循环
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while (tempa != tempb) {
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//如果不为空就指针下移,为空就跳到另一链表的头部
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//如果不为空就指针下移,为空就跳到另一链表的头部
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tempa = tempa != nullptr ? tempa->next: headB;
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tempb = tempb != nullptr ? tempb->next: headA;
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}
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return tempa;
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return tempa;//返回tempb也行
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}
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};
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```
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JS Code:
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```js
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var getIntersectionNode = function(headA, headB) {
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//定义两个节点
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let tempa = headA;
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let tempb = headB;
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//循环
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while (tempa != tempb) {
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//如果不为空就指针下移,为空就跳到另一链表的头部
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tempa = tempa != null ? tempa.next: headB;
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tempb = tempb != null ? tempb.next: headA;
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}
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return tempa;//返回tempb也行
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};
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```
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Python Code:
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```py
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class Solution:
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def getIntersectionNode(self, headA: ListNode, headB: ListNode) -> ListNode:
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# 定义两个节点
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tempa = headA
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tempb = headB
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# 循环
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while tempa is not tempb:
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# 如果不为空就指针下移,为空就跳到另一链表的头部
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tempa = tempa.next if tempa is not None else headB
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tempb = tempb.next if tempb is not None else headA
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return tempa # 返回tempb也行
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```
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好啦,链表的题目就结束啦,希望大家能有所收获,下周就要更新新的题型啦,继续坚持,肯定会有收获的。
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