a.cpp

#define vector<int> vi;vi NGE(vi a){    stack<int>s;    vi next(a.size());    int n = a.size();    for(int i = n-1; i >= 0; i--)    {        while(!s.empty() && s.top() <= a[i])            s.pop();        if(s.empty())            next[i] = -1;        else            next[i] = s.top();

        s.push(a[i]);    }

    return next;}