WORST_CASE(Omega(1),?) ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: l8 0: l0 -> l1 : i^0'=i^post_1, [ 3<=i^0 && i^0==i^post_1 ], cost: 1 1: l0 -> l2 : i^0'=i^post_2, [ 1+i^0<=3 && i^post_2==1+i^0 ], cost: 1 7: l1 -> l6 : i^0'=i^post_8, [ i^0==i^post_8 ], cost: 1 5: l2 -> l3 : i^0'=i^post_6, [ i^0==i^post_6 ], cost: 1 2: l3 -> l0 : i^0'=i^post_3, [ i^0==i^post_3 ], cost: 1 3: l3 -> l0 : i^0'=i^post_4, [ i^0==i^post_4 ], cost: 1 4: l3 -> l1 : i^0'=i^post_5, [ i^0==i^post_5 ], cost: 1 6: l4 -> l5 : i^0'=i^post_7, [ i^0==i^post_7 ], cost: 1 8: l6 -> l4 : i^0'=i^post_9, [ 1+i^0<=2 && i^0==i^post_9 ], cost: 1 9: l6 -> l4 : i^0'=i^post_10, [ 2<=i^0 && i^0==i^post_10 ], cost: 1 10: l7 -> l2 : i^0'=i^post_11, [ i^post_11==0 ], cost: 1 11: l8 -> l7 : i^0'=i^post_12, [ i^0==i^post_12 ], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 11: l8 -> l7 : i^0'=i^post_12, [ i^0==i^post_12 ], cost: 1 Removed unreachable and leaf rules: Start location: l8 1: l0 -> l2 : i^0'=i^post_2, [ 1+i^0<=3 && i^post_2==1+i^0 ], cost: 1 5: l2 -> l3 : i^0'=i^post_6, [ i^0==i^post_6 ], cost: 1 2: l3 -> l0 : i^0'=i^post_3, [ i^0==i^post_3 ], cost: 1 3: l3 -> l0 : i^0'=i^post_4, [ i^0==i^post_4 ], cost: 1 10: l7 -> l2 : i^0'=i^post_11, [ i^post_11==0 ], cost: 1 11: l8 -> l7 : i^0'=i^post_12, [ i^0==i^post_12 ], cost: 1 Simplified all rules, resulting in: Start location: l8 1: l0 -> l2 : i^0'=1+i^0, [ 1+i^0<=3 ], cost: 1 5: l2 -> l3 : [], cost: 1 3: l3 -> l0 : [], cost: 1 10: l7 -> l2 : i^0'=0, [], cost: 1 11: l8 -> l7 : [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: l8 14: l2 -> l2 : i^0'=1+i^0, [ 1+i^0<=3 ], cost: 3 12: l8 -> l2 : i^0'=0, [], cost: 2 Accelerating simple loops of location 2. Accelerating the following rules: 14: l2 -> l2 : i^0'=1+i^0, [ 1+i^0<=3 ], cost: 3 Accelerated rule 14 with backward acceleration, yielding the new rule 15. [accelerate] Nesting with 1 inner and 1 outer candidates Removing the simple loops: 14. Accelerated all simple loops using metering functions (where possible): Start location: l8 15: l2 -> l2 : i^0'=3, [ 3-i^0>=0 ], cost: 9-3*i^0 12: l8 -> l2 : i^0'=0, [], cost: 2 Chained accelerated rules (with incoming rules): Start location: l8 12: l8 -> l2 : i^0'=0, [], cost: 2 16: l8 -> l2 : i^0'=3, [], cost: 11 Removed unreachable locations (and leaf rules with constant cost): Start location: l8 ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: l8 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: [ i^0==i^post_12 ] WORST_CASE(Omega(1),?)