link list binary to decimal

-
 /**
 * 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 rev(ListNode* head, vector<int>&v)
    {
        if(head==0)
            return;
        else
            rev(head->next,v);
        v.push_back(head->val);
    }
    int getDecimalValue(ListNode* head) 
    {
        vector<int>v;
        rev(head,v);
        int sum=0,i=1;
        for(auto it: v){
            if(it==1)
            {
                sum+=i;
            }
            i*=2;
        }
        return sum;
    }
};

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