NEXT GREATER ELEMENT USING STACK

#include <iostream>
#include <vector>
#include <stack>
using namespace std;
vector<int> NGE(vector<int> m)
{
       vector<int>nge(m.size());
       stack<int>s;
       for (int i = 0; i < m.size(); i++)
    {
       while (!s.empty() && m[s.top()] < m[i])
        {
           nge[s.top()] = i;
            s.pop();
        }
        s.push(i);
    }
    while (!s.empty())
    {
        nge[s.top()]=-1;
        s.pop();
    }
    return nge;
}

int main()
{
    vector<int> m;
    stack<int> s;
    int n;
    cout << "ENTER THE VECTOR SIZE-->";
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        int t;
        cin >> t;
        m.push_back(t);
    }
    for (auto value : m)
    {
        cout << value << " ";
    }
    cout << endl;
 vector<int> v=NGE(m);
 for(int i=0;i<n;i++)
 {
    cout<<m[i]<<"="<<(v[i]==-1?  -1:m[v[i]])<<endl;
    
 }
    return 0;
}