WORST_CASE(Omega(1),?) ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: __init 0: f1 -> f2 : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2==arg2P_1 ], cost: 1 1: f2 -> f3 : arg1'=arg1P_2, arg2'=arg2P_2, [ arg1==arg1P_2 ], cost: 1 3: f3 -> f4 : arg1'=arg1P_4, arg2'=arg2P_4, [ arg1>0 && arg1>arg2 && arg1==arg1P_4 && arg2==arg2P_4 ], cost: 1 5: f3 -> f6 : arg1'=arg1P_6, arg2'=arg2P_6, [ arg1<=0 && arg1==arg1P_6 && arg2==arg2P_6 ], cost: 1 6: f3 -> f6 : arg1'=arg1P_7, arg2'=arg2P_7, [ arg1<=arg2 && arg1==arg1P_7 && arg2==arg2P_7 ], cost: 1 2: f4 -> f5 : arg1'=arg1P_3, arg2'=arg2P_3, [ arg2P_3==arg2+arg1 && arg1==arg1P_3 ], cost: 1 4: f5 -> f3 : arg1'=arg1P_5, arg2'=arg2P_5, [ arg1==arg1P_5 && arg2==arg2P_5 ], cost: 1 7: __init -> f1 : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 7: __init -> f1 : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Removed unreachable and leaf rules: Start location: __init 0: f1 -> f2 : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2==arg2P_1 ], cost: 1 1: f2 -> f3 : arg1'=arg1P_2, arg2'=arg2P_2, [ arg1==arg1P_2 ], cost: 1 3: f3 -> f4 : arg1'=arg1P_4, arg2'=arg2P_4, [ arg1>0 && arg1>arg2 && arg1==arg1P_4 && arg2==arg2P_4 ], cost: 1 2: f4 -> f5 : arg1'=arg1P_3, arg2'=arg2P_3, [ arg2P_3==arg2+arg1 && arg1==arg1P_3 ], cost: 1 4: f5 -> f3 : arg1'=arg1P_5, arg2'=arg2P_5, [ arg1==arg1P_5 && arg2==arg2P_5 ], cost: 1 7: __init -> f1 : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Simplified all rules, resulting in: Start location: __init 0: f1 -> f2 : arg1'=arg1P_1, [], cost: 1 1: f2 -> f3 : arg2'=arg2P_2, [], cost: 1 3: f3 -> f4 : [ arg1>0 && arg1>arg2 ], cost: 1 2: f4 -> f5 : arg2'=arg2+arg1, [], cost: 1 4: f5 -> f3 : [], cost: 1 7: __init -> f1 : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: __init 11: f3 -> f3 : arg2'=arg2+arg1, [ arg1>0 && arg1>arg2 ], cost: 3 9: __init -> f3 : arg1'=arg1P_1, arg2'=arg2P_2, [], cost: 3 Accelerating simple loops of location 2. Accelerating the following rules: 11: f3 -> f3 : arg2'=arg2+arg1, [ arg1>0 && arg1>arg2 ], cost: 3 Accelerated rule 11 with backward acceleration, yielding the new rule 12. [accelerate] Nesting with 1 inner and 1 outer candidates Removing the simple loops: 11. Accelerated all simple loops using metering functions (where possible): Start location: __init 12: f3 -> f3 : arg2'=arg2+k*arg1, [ arg1>0 && k>=0 && arg1>arg2+(-1+k)*arg1 ], cost: 3*k 9: __init -> f3 : arg1'=arg1P_1, arg2'=arg2P_2, [], cost: 3 Chained accelerated rules (with incoming rules): Start location: __init 9: __init -> f3 : arg1'=arg1P_1, arg2'=arg2P_2, [], cost: 3 13: __init -> f3 : arg1'=arg1P_1, arg2'=arg2P_2+k*arg1P_1, [ arg1P_1>0 && k>=0 && arg1P_1>arg2P_2+arg1P_1*(-1+k) ], cost: 3+3*k Removed unreachable locations (and leaf rules with constant cost): Start location: __init 13: __init -> f3 : arg1'=arg1P_1, arg2'=arg2P_2+k*arg1P_1, [ arg1P_1>0 && k>=0 && arg1P_1>arg2P_2+arg1P_1*(-1+k) ], cost: 3+3*k ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: __init 13: __init -> f3 : arg1'=arg1P_1, arg2'=arg2P_2+k*arg1P_1, [ arg1P_1>0 && k>=0 && arg1P_1>arg2P_2+arg1P_1*(-1+k) ], cost: 3+3*k Computing asymptotic complexity for rule 13 Resulting cost 0 has complexity: Unknown 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: [] WORST_CASE(Omega(1),?)