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, arg3'=arg3P_1, [ arg1==arg1P_1 && arg2==arg2P_1 ], cost: 1 1: f2 -> f3 : arg1'=arg1P_2, arg2'=arg2P_2, arg3'=arg3P_2, [ arg1==arg1P_2 && arg3==arg3P_2 ], cost: 1 2: f3 -> f4 : arg1'=arg1P_3, arg2'=arg2P_3, arg3'=arg3P_3, [ arg3==arg1P_3 && arg2==arg2P_3 && arg3==arg3P_3 ], cost: 1 16: f4 -> f5 : arg1'=arg1P_17, arg2'=arg2P_17, arg3'=arg3P_17, [ arg1>=0 && arg1==arg1P_17 && arg2==arg2P_17 && arg3==arg3P_17 ], cost: 1 17: f4 -> f6 : arg1'=arg1P_18, arg2'=arg2P_18, arg3'=arg3P_18, [ arg1<0 && arg1==arg1P_18 && arg2==arg2P_18 && arg3==arg3P_18 ], cost: 1 3: f8 -> f9 : arg1'=arg1P_4, arg2'=arg2P_4, arg3'=arg3P_4, [ arg1==arg1P_4 && 1==arg2P_4 && arg3==arg3P_4 ], cost: 1 8: f9 -> f10 : arg1'=arg1P_9, arg2'=arg2P_9, arg3'=arg3P_9, [ arg2 f11 : arg1'=arg1P_10, arg2'=arg2P_10, arg3'=arg3P_10, [ arg2>=arg1 && arg1==arg1P_10 && arg2==arg2P_10 && arg3==arg3P_10 ], cost: 1 4: f13 -> f14 : arg1'=arg1P_5, arg2'=arg2P_5, arg3'=arg3P_5, [ arg2P_5==2*arg2 && arg1==arg1P_5 && arg3==arg3P_5 ], cost: 1 6: f14 -> f10 : arg1'=arg1P_7, arg2'=arg2P_7, arg3'=arg3P_7, [ arg1==arg1P_7 && arg2==arg2P_7 && arg3==arg3P_7 ], cost: 1 5: f10 -> f13 : arg1'=arg1P_6, arg2'=arg2P_6, arg3'=arg3P_6, [ arg2 f15 : arg1'=arg1P_8, arg2'=arg2P_8, arg3'=arg3P_8, [ arg2>=arg1 && arg1==arg1P_8 && arg2==arg2P_8 && arg3==arg3P_8 ], cost: 1 10: f15 -> f12 : arg1'=arg1P_11, arg2'=arg2P_11, arg3'=arg3P_11, [ arg1==arg1P_11 && arg2==arg2P_11 && arg3==arg3P_11 ], cost: 1 11: f11 -> f12 : arg1'=arg1P_12, arg2'=arg2P_12, arg3'=arg3P_12, [ arg1==arg1P_12 && arg2==arg2P_12 && arg3==arg3P_12 ], cost: 1 12: f12 -> f16 : arg1'=arg1P_13, arg2'=arg2P_13, arg3'=arg3P_13, [ arg1P_13==-1+arg1 && arg2==arg2P_13 && arg3==arg3P_13 ], cost: 1 14: f16 -> f5 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, [ arg1==arg1P_15 && arg2==arg2P_15 && arg3==arg3P_15 ], cost: 1 13: f5 -> f8 : arg1'=arg1P_14, arg2'=arg2P_14, arg3'=arg3P_14, [ arg1>=0 && arg1==arg1P_14 && arg2==arg2P_14 && arg3==arg3P_14 ], cost: 1 15: f5 -> f17 : arg1'=arg1P_16, arg2'=arg2P_16, arg3'=arg3P_16, [ arg1<0 && arg1==arg1P_16 && arg2==arg2P_16 && arg3==arg3P_16 ], cost: 1 18: f17 -> f7 : arg1'=arg1P_19, arg2'=arg2P_19, arg3'=arg3P_19, [ arg1==arg1P_19 && arg2==arg2P_19 && arg3==arg3P_19 ], cost: 1 19: f6 -> f7 : arg1'=arg1P_20, arg2'=arg2P_20, arg3'=arg3P_20, [ arg1==arg1P_20 && arg2==arg2P_20 && arg3==arg3P_20 ], cost: 1 20: __init -> f1 : arg1'=arg1P_21, arg2'=arg2P_21, arg3'=arg3P_21, [], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 20: __init -> f1 : arg1'=arg1P_21, arg2'=arg2P_21, arg3'=arg3P_21, [], cost: 1 Removed unreachable and leaf rules: Start location: __init 0: f1 -> f2 : arg1'=arg1P_1, arg2'=arg2P_1, arg3'=arg3P_1, [ arg1==arg1P_1 && arg2==arg2P_1 ], cost: 1 1: f2 -> f3 : arg1'=arg1P_2, arg2'=arg2P_2, arg3'=arg3P_2, [ arg1==arg1P_2 && arg3==arg3P_2 ], cost: 1 2: f3 -> f4 : arg1'=arg1P_3, arg2'=arg2P_3, arg3'=arg3P_3, [ arg3==arg1P_3 && arg2==arg2P_3 && arg3==arg3P_3 ], cost: 1 16: f4 -> f5 : arg1'=arg1P_17, arg2'=arg2P_17, arg3'=arg3P_17, [ arg1>=0 && arg1==arg1P_17 && arg2==arg2P_17 && arg3==arg3P_17 ], cost: 1 3: f8 -> f9 : arg1'=arg1P_4, arg2'=arg2P_4, arg3'=arg3P_4, [ arg1==arg1P_4 && 1==arg2P_4 && arg3==arg3P_4 ], cost: 1 8: f9 -> f10 : arg1'=arg1P_9, arg2'=arg2P_9, arg3'=arg3P_9, [ arg2 f11 : arg1'=arg1P_10, arg2'=arg2P_10, arg3'=arg3P_10, [ arg2>=arg1 && arg1==arg1P_10 && arg2==arg2P_10 && arg3==arg3P_10 ], cost: 1 4: f13 -> f14 : arg1'=arg1P_5, arg2'=arg2P_5, arg3'=arg3P_5, [ arg2P_5==2*arg2 && arg1==arg1P_5 && arg3==arg3P_5 ], cost: 1 6: f14 -> f10 : arg1'=arg1P_7, arg2'=arg2P_7, arg3'=arg3P_7, [ arg1==arg1P_7 && arg2==arg2P_7 && arg3==arg3P_7 ], cost: 1 5: f10 -> f13 : arg1'=arg1P_6, arg2'=arg2P_6, arg3'=arg3P_6, [ arg2 f15 : arg1'=arg1P_8, arg2'=arg2P_8, arg3'=arg3P_8, [ arg2>=arg1 && arg1==arg1P_8 && arg2==arg2P_8 && arg3==arg3P_8 ], cost: 1 10: f15 -> f12 : arg1'=arg1P_11, arg2'=arg2P_11, arg3'=arg3P_11, [ arg1==arg1P_11 && arg2==arg2P_11 && arg3==arg3P_11 ], cost: 1 11: f11 -> f12 : arg1'=arg1P_12, arg2'=arg2P_12, arg3'=arg3P_12, [ arg1==arg1P_12 && arg2==arg2P_12 && arg3==arg3P_12 ], cost: 1 12: f12 -> f16 : arg1'=arg1P_13, arg2'=arg2P_13, arg3'=arg3P_13, [ arg1P_13==-1+arg1 && arg2==arg2P_13 && arg3==arg3P_13 ], cost: 1 14: f16 -> f5 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, [ arg1==arg1P_15 && arg2==arg2P_15 && arg3==arg3P_15 ], cost: 1 13: f5 -> f8 : arg1'=arg1P_14, arg2'=arg2P_14, arg3'=arg3P_14, [ arg1>=0 && arg1==arg1P_14 && arg2==arg2P_14 && arg3==arg3P_14 ], cost: 1 20: __init -> f1 : arg1'=arg1P_21, arg2'=arg2P_21, arg3'=arg3P_21, [], cost: 1 Simplified all rules, resulting in: Start location: __init 0: f1 -> f2 : arg3'=arg3P_1, [], cost: 1 1: f2 -> f3 : arg2'=arg2P_2, [], cost: 1 2: f3 -> f4 : arg1'=arg3, [], cost: 1 16: f4 -> f5 : [ arg1>=0 ], cost: 1 3: f8 -> f9 : arg2'=1, [], cost: 1 8: f9 -> f10 : [ arg2 f11 : [ arg2>=arg1 ], cost: 1 4: f13 -> f14 : arg2'=2*arg2, [], cost: 1 6: f14 -> f10 : [], cost: 1 5: f10 -> f13 : [ arg2 f15 : [ arg2>=arg1 ], cost: 1 10: f15 -> f12 : [], cost: 1 11: f11 -> f12 : [], cost: 1 12: f12 -> f16 : arg1'=-1+arg1, [], cost: 1 14: f16 -> f5 : [], cost: 1 13: f5 -> f8 : [ arg1>=0 ], cost: 1 20: __init -> f1 : arg1'=arg1P_21, arg2'=arg2P_21, arg3'=arg3P_21, [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: __init 8: f9 -> f10 : [ arg2 f12 : [ arg2>=arg1 ], cost: 2 28: f10 -> f12 : [ arg2>=arg1 ], cost: 2 29: f10 -> f10 : arg2'=2*arg2, [ arg2 f5 : arg1'=-1+arg1, [], cost: 2 25: f5 -> f9 : arg2'=1, [ arg1>=0 ], cost: 2 24: __init -> f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Accelerating simple loops of location 8. Accelerating the following rules: 29: f10 -> f10 : arg2'=2*arg2, [ arg2 f10 : [ arg2 f12 : [ arg2>=arg1 ], cost: 2 28: f10 -> f12 : [ arg2>=arg1 ], cost: 2 29: f10 -> f10 : arg2'=2*arg2, [ arg2 [18] : [ arg2 f5 : arg1'=-1+arg1, [], cost: 2 25: f5 -> f9 : arg2'=1, [ arg1>=0 ], cost: 2 24: __init -> f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Chained accelerated rules (with incoming rules): Start location: __init 8: f9 -> f10 : [ arg2 f12 : [ arg2>=arg1 ], cost: 2 32: f9 -> f10 : arg2'=2*arg2, [ arg2 [18] : [ arg2 f12 : [ arg2>=arg1 ], cost: 2 30: f12 -> f5 : arg1'=-1+arg1, [], cost: 2 25: f5 -> f9 : arg2'=1, [ arg1>=0 ], cost: 2 24: __init -> f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Eliminated locations (on tree-shaped paths): Start location: __init 28: f10 -> f12 : [ arg2>=arg1 ], cost: 2 30: f12 -> f5 : arg1'=-1+arg1, [], cost: 2 34: f5 -> f10 : arg2'=1, [ 1 f12 : arg2'=1, [ arg1>=0 && 1>=arg1 ], cost: 4 36: f5 -> f10 : arg2'=2, [ 1 f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Applied pruning (of leafs and parallel rules): Start location: __init 28: f10 -> f12 : [ arg2>=arg1 ], cost: 2 30: f12 -> f5 : arg1'=-1+arg1, [], cost: 2 34: f5 -> f10 : arg2'=1, [ 1 f12 : arg2'=1, [ arg1>=0 && 1>=arg1 ], cost: 4 36: f5 -> f10 : arg2'=2, [ 1 f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Eliminated locations (on tree-shaped paths): Start location: __init 38: f5 -> f5 : arg1'=-1+arg1, arg2'=1, [ arg1>=0 && 1>=arg1 ], cost: 6 39: f5 -> f5 : arg1'=-1+arg1, arg2'=2, [ 1=arg1 ], cost: 10 24: __init -> f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Accelerating simple loops of location 13. Simplified some of the simple loops (and removed duplicate rules). Accelerating the following rules: 38: f5 -> f5 : arg1'=-1+arg1, arg2'=1, [ arg1>=0 && 1>=arg1 ], cost: 6 39: f5 -> f5 : arg1'=-1+arg1, arg2'=2, [ 2-arg1==0 ], cost: 10 Accelerated rule 38 with backward acceleration, yielding the new rule 40. Failed to prove monotonicity of the guard of rule 39. [accelerate] Nesting with 2 inner and 2 outer candidates Removing the simple loops: 38. Accelerated all simple loops using metering functions (where possible): Start location: __init 39: f5 -> f5 : arg1'=-1+arg1, arg2'=2, [ 2-arg1==0 ], cost: 10 40: f5 -> f5 : arg1'=-1, arg2'=1, [ 1>=arg1 && 1+arg1>=1 ], cost: 6+6*arg1 24: __init -> f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 Chained accelerated rules (with incoming rules): Start location: __init 24: __init -> f5 : arg1'=arg3P_1, arg2'=arg2P_2, arg3'=arg3P_1, [ arg3P_1>=0 ], cost: 5 41: __init -> f5 : arg1'=1, arg2'=2, arg3'=2, [], cost: 15 42: __init -> f5 : arg1'=-1, arg2'=1, arg3'=arg3P_1, [ arg3P_1>=0 && 1>=arg3P_1 ], cost: 11+6*arg3P_1 Removed unreachable locations (and leaf rules with constant cost): Start location: __init 42: __init -> f5 : arg1'=-1, arg2'=1, arg3'=arg3P_1, [ arg3P_1>=0 && 1>=arg3P_1 ], cost: 11+6*arg3P_1 ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: __init 42: __init -> f5 : arg1'=-1, arg2'=1, arg3'=arg3P_1, [ arg3P_1>=0 && 1>=arg3P_1 ], cost: 11+6*arg3P_1 Computing asymptotic complexity for rule 42 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),?)