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vector<int> l(n, -1), r(n, n);
stack<int> s;
 
for (int i = 0; i < n; i++) 
{
    while (s.size() && arr[s.top()] < arr[i])	// If equal on right => can extend
    {
        r[s.top()] = i;
        s.pop();
    }
 
    if (s.size())		// If equal on left => CANNOT extend
        l[i] = s.top();
 
    s.push(i);
}

prog.cpp:1:1: error: ‘vector’ does not name a type
 vector<int> l(n, -1), r(n, n);
 ^~~~~~
prog.cpp:2:1: error: ‘stack’ does not name a type
 stack<int> s;
 ^~~~~
prog.cpp:4:1: error: expected unqualified-id before ‘for’
 for (int i = 0; i < n; i++)
 ^~~
prog.cpp:4:17: error: ‘i’ does not name a type
 for (int i = 0; i < n; i++)
                 ^
prog.cpp:4:24: error: ‘i’ does not name a type
 for (int i = 0; i < n; i++)
                        ^

Standard output is empty