YES(?,POLY)

'Pop* with parameter subtitution (timeout of 60.0 seconds)'
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Answer:           YES(?,POLY)
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  rev(ls) -> r1(ls, empty())
     , r1(empty(), a) -> a
     , r1(cons(x, k), a) -> r1(k, cons(x, a))}

Proof Output:    
  The input was oriented with the instance of POP* as induced by the precedence
  
   rev > r1
  
  and safe mapping
  
   safe(rev) = {}, safe(r1) = {2}, safe(empty) = {},
   safe(cons) = {1, 2} .
  
  For your convenience, here is the input in predicative notation:
  
   Rules:
    {  rev(ls;) -> r1(ls; empty())
     , r1(empty(); a) -> a
     , r1(cons(; x, k); a) -> r1(k; cons(; x, a))}