I am solving this leetcode question -> https://leetcode.com/problems/next-greater-node-in-linked-list/`your

and this is showing error ->Line 172: Char 16: runtime error: reference binding to misaligned address 0xbebebebebebec0ba for type ‘int’, which requires 4 byte alignment (stl_deque.h)
0xbebebebebebec0ba: note: pointer points here

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_deque.h:181:16

My code->

class Solution {
public:
    vector<int> nextLargerNodes(ListNode* head) {
        vector<int> v;
        if(head->next==nullptr){
            v.push_back(0);
            return v;
        }
        int a;
        vector<unsigned> ll;
       while(head!=nullptr){
           a=head->val;
           ll.push_back(a);
           head=head->next;
       }
        
        stack<int> s;
        for(int i=ll.size()-1;i>=0;i--){
            if(s.size()==0){
                v.push_back(0);
            }
            else if(s.top()>ll[i]){
                v.push_back(s.top());
            }
            else if(s.top()<ll[i]){
                while(s.top()<=ll[i]){
                    if(s.size()!=0){
                    s.pop();}
                }
                if(s.size()==0){
                    v.push_back(0);
                }
                else{
                v.push_back(s.top());}
            }
            s.push(ll[i]);
            
            
        }
        reverse(v.begin(),v.end());
        return v;
    }
};