LeetCode 430. Faltten a Multilevel Doubly Linked List
2024-09-01 06:21:39
题目链接：LeetCode 430. Faltten a Multilevel Doubly Linked List
class Node {
public:
int val = NULL;
Node* prev = NULL;
Node* next = NULL;
Node* child = NULL;
Node() {}
Node(int _val, Node* _prev, Node* _next, Node* _child) {
val = _val;
prev = _prev;
next = _next;
child = _child;
}
};
class Solution {
public:
// 解法一：迭代
Node* flatten_iteration(Node *head) {
if (head == NULL) {
return NULL;
}
for (Node *p = head; p != NULL; p = p->next) {
Node *next = p->next;
if (p->child != NULL) {
p->next = p->child;
p->child->prev = p;
p->child = NULL;
Node *tmp = p->next;
while (tmp->next != NULL) {
tmp = tmp->next;
}
tmp->next = next;
next->prev = tmp;
}
}
return head;
}
// 解法二：递归
Node* flatten_recursion(Node *head) {
if (head == NULL) {
return head;
}
Node *p = head;
while (p != NULL) {
if (p->child != NULL) {
Node *next = p->next;
Node *nextLayer = flatten_recursion(p->child);
p->next = nextLayer;
nextLayer->prev = p;
p->child = NULL;
while (nextLayer->next != NULL) {
nextLayer = nextLayer->next;
}
nextLayer->next = next;
if (next != NULL) {
next->prev = nextLayer;
}
}
p = p->next;
}
return head;
}
};
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