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LeetCode "Copy List with Random Pointer"
Two passes: all pointer linking info will be recorded in 1st pass - to hashmap; 2nd pass recover the pointer relationship from hashmap. 1A!
class Solution {public: RandomListNode *copyRandomList(RandomListNode *head) { if (!head) return NULL; vector<RandomListNode *> vec; unordered_map<RandomListNode *, unsigned> ptrMap; // 1st pass RandomListNode *p = head; unsigned i = 0; while (p) { RandomListNode *pCurr = new RandomListNode(p->label); pCurr->random = p->random; pCurr->next = p->next; vec.push_back(pCurr); ptrMap.insert(make_pair(p, i ++)); p = p->next; } // 2nd pass for (int i = 0; i < vec.size(); i++) { RandomListNode *pCurr = vec[i]; if (pCurr->next) pCurr->next = vec[ptrMap[pCurr->next]]; if (pCurr->random) pCurr->random = vec[ptrMap[pCurr->random]]; } return vec[0]; }};
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