WORST_CASE(Omega(1),?) ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: l5 0: l0 -> l1 : counter^0'=counter^post_1, y^0'=y^post_1, z^0'=z^post_1, [ 36<=counter^0 && counter^0==counter^post_1 && y^0==y^post_1 && z^0==z^post_1 ], cost: 1 1: l0 -> l2 : counter^0'=counter^post_2, y^0'=y^post_2, z^0'=z^post_2, [ 1+counter^0<=36 && z^post_2==1+z^0 && counter^post_2==1+counter^0 && y^0==y^post_2 ], cost: 1 4: l2 -> l0 : counter^0'=counter^post_5, y^0'=y^post_5, z^0'=z^post_5, [ counter^0==counter^post_5 && y^0==y^post_5 && z^0==z^post_5 ], cost: 1 2: l3 -> l2 : counter^0'=counter^post_3, y^0'=y^post_3, z^0'=z^post_3, [ y^0<=127 && z^post_3==z^post_3 && counter^0==counter^post_3 && y^0==y^post_3 ], cost: 1 3: l3 -> l1 : counter^0'=counter^post_4, y^0'=y^post_4, z^0'=z^post_4, [ 128<=y^0 && counter^0==counter^post_4 && y^0==y^post_4 && z^0==z^post_4 ], cost: 1 5: l4 -> l3 : counter^0'=counter^post_6, y^0'=y^post_6, z^0'=z^post_6, [ counter^post_6==0 && y^0==y^post_6 && z^0==z^post_6 ], cost: 1 6: l5 -> l4 : counter^0'=counter^post_7, y^0'=y^post_7, z^0'=z^post_7, [ counter^0==counter^post_7 && y^0==y^post_7 && z^0==z^post_7 ], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 6: l5 -> l4 : counter^0'=counter^post_7, y^0'=y^post_7, z^0'=z^post_7, [ counter^0==counter^post_7 && y^0==y^post_7 && z^0==z^post_7 ], cost: 1 Removed unreachable and leaf rules: Start location: l5 1: l0 -> l2 : counter^0'=counter^post_2, y^0'=y^post_2, z^0'=z^post_2, [ 1+counter^0<=36 && z^post_2==1+z^0 && counter^post_2==1+counter^0 && y^0==y^post_2 ], cost: 1 4: l2 -> l0 : counter^0'=counter^post_5, y^0'=y^post_5, z^0'=z^post_5, [ counter^0==counter^post_5 && y^0==y^post_5 && z^0==z^post_5 ], cost: 1 2: l3 -> l2 : counter^0'=counter^post_3, y^0'=y^post_3, z^0'=z^post_3, [ y^0<=127 && z^post_3==z^post_3 && counter^0==counter^post_3 && y^0==y^post_3 ], cost: 1 5: l4 -> l3 : counter^0'=counter^post_6, y^0'=y^post_6, z^0'=z^post_6, [ counter^post_6==0 && y^0==y^post_6 && z^0==z^post_6 ], cost: 1 6: l5 -> l4 : counter^0'=counter^post_7, y^0'=y^post_7, z^0'=z^post_7, [ counter^0==counter^post_7 && y^0==y^post_7 && z^0==z^post_7 ], cost: 1 Simplified all rules, resulting in: Start location: l5 1: l0 -> l2 : counter^0'=1+counter^0, z^0'=1+z^0, [ 1+counter^0<=36 ], cost: 1 4: l2 -> l0 : [], cost: 1 2: l3 -> l2 : z^0'=z^post_3, [ y^0<=127 ], cost: 1 5: l4 -> l3 : counter^0'=0, [], cost: 1 6: l5 -> l4 : [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: l5 9: l2 -> l2 : counter^0'=1+counter^0, z^0'=1+z^0, [ 1+counter^0<=36 ], cost: 2 8: l5 -> l2 : counter^0'=0, z^0'=z^post_3, [ y^0<=127 ], cost: 3 Accelerating simple loops of location 2. Accelerating the following rules: 9: l2 -> l2 : counter^0'=1+counter^0, z^0'=1+z^0, [ 1+counter^0<=36 ], cost: 2 Accelerated rule 9 with backward acceleration, yielding the new rule 10. [accelerate] Nesting with 1 inner and 1 outer candidates Removing the simple loops: 9. Accelerated all simple loops using metering functions (where possible): Start location: l5 10: l2 -> l2 : counter^0'=36, z^0'=36+z^0-counter^0, [ 36-counter^0>=0 ], cost: 72-2*counter^0 8: l5 -> l2 : counter^0'=0, z^0'=z^post_3, [ y^0<=127 ], cost: 3 Chained accelerated rules (with incoming rules): Start location: l5 8: l5 -> l2 : counter^0'=0, z^0'=z^post_3, [ y^0<=127 ], cost: 3 11: l5 -> l2 : counter^0'=36, z^0'=36+z^post_3, [ y^0<=127 ], cost: 75 Removed unreachable locations (and leaf rules with constant cost): Start location: l5 ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: l5 Obtained the following overall complexity (w.r.t. the length of the input n): Complexity: Constant Cpx degree: 0 Solved cost: 1 Rule cost: 1 Rule guard: [ counter^0==counter^post_7 && y^0==y^post_7 && z^0==z^post_7 ] WORST_CASE(Omega(1),?)