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60 lines (57 loc) · 20.4 KB
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Copy path143-reorder-list.cpp
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60 lines (57 loc) · 20.4 KB
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//https://leetcode.com/problems/reorder-list
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode() : val(0), next(nullptr) {}
* ListNode(int x) : val(x), next(nullptr) {}
* ListNode(int x, ListNode *next) : val(x), next(next) {}
* };
*/
class Solution {
public:
void reorderList(ListNode* head) {
if(head == nullptr || head->next == nullptr || head->next->next == nullptr)
return;
int index = 0;
unordered_map<int, ListNode*> m;
while(head){
m[index++] = head;
head = head->next;
}
int n = index-1;
index = 0;
bool flag = false;
head = nullptr;
ListNode* prev = nullptr;
while(m.size()>0){
if(!flag){
if(head == nullptr){
head = m[index];
prev = m[index];
}else{
prev->next = m[index];
prev = prev->next;
}
m.erase(index);
index++;
}else{
prev->next = m[n];
prev = prev->next;
m.erase(n);
n--;
}
flag = !flag;
}
prev->next = nullptr;
}
};
// [1]
// [1,2]
// [1,2,3]
// [1,2,3,4]
// [1,2,3,4,5]
// [1,2,3,4,5,6,7,8]
// [1,2,3,4,5,6,7,8,9]
// 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