C++ Easy and Beginner Friendly Solution
Intuition\nThis function processes a linked list where segments between consecutive zeroes are summed into new nodes. It starts iterating from the second node (
# Intuition\nThis function processes a linked list where segments between consecutive zeroes are summed into new nodes. It starts iterating from the second node (head->next) to skip the initial zero. As it traverses, it accumulates values (c) until it encounters a zero, then creates a new node with the accumulated sum. The resulting linked list consists of these summed nodes, effectively merging segments of nodes between zeroes into single nodes with their aggregated values.\n\n# Approach\n1. Initialization:\n- temp starts at head->next to skip the initial zero.\n- ans is a new dummy node to construct the result list.\n- tempAns points to the dummy node, used to build the result list.\n- c is a counter to sum the values between zeroes.\n \n2. Traversal and Summation:\n- Traverse the linked list using temp.\n- If temp is not zero, add its value to c.\n- If temp is zero, create a new node with the value c and add it to the result list. Then, reset c to zero.\n \n3. Construction of the Result List:\n- For each segment of values between zeroes, create a new node and link it to the result list.\n- Continue this until the end of the original list.\n\nThe result list is built starting from ans->next to skip the dummy node.\n\n# Complexity\n- Time complexity:\nO(n)\n\n- Space complexity:\nO(1)\n\n# Code\n```\nclass Solution {\npublic:\n    ListNode* mergeNodes(ListNode* head) {\n        ListNode* temp=head->next;\n        ListNode* ans=new ListNode(-1);\n        ListNode* tempAns=ans;\n        int c=0;\n        while(temp){\n            if(temp and temp->val!=0){\n                c+=temp->val;\n            }\n            else if(temp and temp->val==0){\n                ListNode* t=new ListNode(c);\n                tempAns->next=t;\n                tempAns=tempAns->next;\n                c=0;\n            }\n            temp=temp->next;\n        }\n        return ans->next;\n    }\n};\n```
['Linked List', 'Simulation', 'C++']