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:
    {  g(x, y) -> x
     , g(x, y) -> y
     , f(s(x), y, y) -> f(y, x, s(x))}

Proof Output:    
  The input was oriented with the instance of POP* as induced by the precedence
  
   g ~ f
  
  and safe mapping
  
   safe(g) = {}, safe(f) = {3}, safe(s) = {1} .
  
  For your convenience, here is the input in predicative notation:
  
   Rules:
    {  g(x, y;) -> x
     , g(x, y;) -> y
     , f(s(; x), y; y) -> f(y, x; s(; x))}