revert this

Author: lrvideckis

library/monotonic_stack/monotonic_stack.hpp

@@ -7,7 +7,7 @@
 //!   a[le[i]] < a[i]
 //! @time O(n)
 //! @space O(n)
-vi mono_st(const auto& a, auto cmp) {
+vi mono_st(const auto& a, const auto& cmp) {
   vi l(sz(a));
   rep(i, 0, sz(a)) for (l[i] = i - 1;
     l[i] >= 0 && !cmp(a[l[i]], a[i]);) l[i] = l[l[i]];