WORST_CASE(?,O(n^1))
* Step 1: NaturalPI WORST_CASE(?,O(n^1))
    + Considered Problem:
        - Strict TRS:
            f(0()) -> s(0())
            f(s(x)) -> s(s(g(x)))
            g(0()) -> 0()
            g(s(x)) -> f(x)
        - Signature:
            {f/1,g/1} / {0/0,s/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {f,g} and constructors {0,s}
    + Applied Processor:
        NaturalPI {shape = Linear, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing}
    + Details:
        We apply a polynomial interpretation of kind constructor-based(linear):
        The following argument positions are considered usable:
          uargs(s) = {1}
        
        Following symbols are considered usable:
          {f,g}
        TcT has computed the following interpretation:
          p(0) = 0       
          p(f) = 7 + 3*x1
          p(g) = 2 + 3*x1
          p(s) = 2 + x1  
        
        Following rules are strictly oriented:
         f(0()) = 7         
                > 2         
                = s(0())    
        
        f(s(x)) = 13 + 3*x  
                > 6 + 3*x   
                = s(s(g(x)))
        
         g(0()) = 2         
                > 0         
                = 0()       
        
        g(s(x)) = 8 + 3*x   
                > 7 + 3*x   
                = f(x)      
        
        
        Following rules are (at-least) weakly oriented:
        

WORST_CASE(?,O(n^1))