class Solution
{
    public:
    //Function to find the next greater element for each element of the array.
    vector<long long> nextLargerElement(vector<long long> arr, int n){
        
        vector<long long> v;
        
        stack<long long> s;
        for(int i=n-1;i>=0;i--)
        {
            while((!s.empty() && s.top()<=arr[i]))
            {
                s.pop();
            }
            if(s.empty()) v.push_back(-1);
            else 
            {
                v.push_back(s.top());
                
            }
            s.push(arr[i]);
        }
        reverse(v.begin(),v.end());
        return v;
    }
};