WORST_CASE(Omega(1),?) ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: l7 0: l0 -> l1 : __const_42^0'=__const_42^post_1, i1^0'=i1^post_1, [ i1^post_1==1+i1^0 && __const_42^0==__const_42^post_1 ], cost: 1 7: l1 -> l4 : __const_42^0'=__const_42^post_8, i1^0'=i1^post_8, [ __const_42^0==__const_42^post_8 && i1^0==i1^post_8 ], cost: 1 1: l2 -> l0 : __const_42^0'=__const_42^post_2, i1^0'=i1^post_2, [ __const_42^0==__const_42^post_2 && i1^0==i1^post_2 ], cost: 1 2: l3 -> l2 : __const_42^0'=__const_42^post_3, i1^0'=i1^post_3, [ __const_42^0==__const_42^post_3 && i1^0==i1^post_3 ], cost: 1 3: l3 -> l0 : __const_42^0'=__const_42^post_4, i1^0'=i1^post_4, [ __const_42^0==__const_42^post_4 && i1^0==i1^post_4 ], cost: 1 4: l3 -> l2 : __const_42^0'=__const_42^post_5, i1^0'=i1^post_5, [ __const_42^0==__const_42^post_5 && i1^0==i1^post_5 ], cost: 1 5: l4 -> l5 : __const_42^0'=__const_42^post_6, i1^0'=i1^post_6, [ __const_42^0<=i1^0 && __const_42^0==__const_42^post_6 && i1^0==i1^post_6 ], cost: 1 6: l4 -> l3 : __const_42^0'=__const_42^post_7, i1^0'=i1^post_7, [ 1+i1^0<=__const_42^0 && __const_42^0==__const_42^post_7 && i1^0==i1^post_7 ], cost: 1 8: l6 -> l1 : __const_42^0'=__const_42^post_9, i1^0'=i1^post_9, [ i1^post_9==0 && __const_42^0==__const_42^post_9 ], cost: 1 9: l7 -> l6 : __const_42^0'=__const_42^post_10, i1^0'=i1^post_10, [ __const_42^0==__const_42^post_10 && i1^0==i1^post_10 ], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 9: l7 -> l6 : __const_42^0'=__const_42^post_10, i1^0'=i1^post_10, [ __const_42^0==__const_42^post_10 && i1^0==i1^post_10 ], cost: 1 Removed unreachable and leaf rules: Start location: l7 0: l0 -> l1 : __const_42^0'=__const_42^post_1, i1^0'=i1^post_1, [ i1^post_1==1+i1^0 && __const_42^0==__const_42^post_1 ], cost: 1 7: l1 -> l4 : __const_42^0'=__const_42^post_8, i1^0'=i1^post_8, [ __const_42^0==__const_42^post_8 && i1^0==i1^post_8 ], cost: 1 1: l2 -> l0 : __const_42^0'=__const_42^post_2, i1^0'=i1^post_2, [ __const_42^0==__const_42^post_2 && i1^0==i1^post_2 ], cost: 1 2: l3 -> l2 : __const_42^0'=__const_42^post_3, i1^0'=i1^post_3, [ __const_42^0==__const_42^post_3 && i1^0==i1^post_3 ], cost: 1 3: l3 -> l0 : __const_42^0'=__const_42^post_4, i1^0'=i1^post_4, [ __const_42^0==__const_42^post_4 && i1^0==i1^post_4 ], cost: 1 4: l3 -> l2 : __const_42^0'=__const_42^post_5, i1^0'=i1^post_5, [ __const_42^0==__const_42^post_5 && i1^0==i1^post_5 ], cost: 1 6: l4 -> l3 : __const_42^0'=__const_42^post_7, i1^0'=i1^post_7, [ 1+i1^0<=__const_42^0 && __const_42^0==__const_42^post_7 && i1^0==i1^post_7 ], cost: 1 8: l6 -> l1 : __const_42^0'=__const_42^post_9, i1^0'=i1^post_9, [ i1^post_9==0 && __const_42^0==__const_42^post_9 ], cost: 1 9: l7 -> l6 : __const_42^0'=__const_42^post_10, i1^0'=i1^post_10, [ __const_42^0==__const_42^post_10 && i1^0==i1^post_10 ], cost: 1 Simplified all rules, resulting in: Start location: l7 0: l0 -> l1 : i1^0'=1+i1^0, [], cost: 1 7: l1 -> l4 : [], cost: 1 1: l2 -> l0 : [], cost: 1 3: l3 -> l0 : [], cost: 1 4: l3 -> l2 : [], cost: 1 6: l4 -> l3 : [ 1+i1^0<=__const_42^0 ], cost: 1 8: l6 -> l1 : i1^0'=0, [], cost: 1 9: l7 -> l6 : [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: l7 0: l0 -> l1 : i1^0'=1+i1^0, [], cost: 1 11: l1 -> l3 : [ 1+i1^0<=__const_42^0 ], cost: 2 3: l3 -> l0 : [], cost: 1 12: l3 -> l0 : [], cost: 2 10: l7 -> l1 : i1^0'=0, [], cost: 2 Eliminated locations (on tree-shaped paths): Start location: l7 0: l0 -> l1 : i1^0'=1+i1^0, [], cost: 1 13: l1 -> l0 : [ 1+i1^0<=__const_42^0 ], cost: 3 14: l1 -> l0 : [ 1+i1^0<=__const_42^0 ], cost: 4 10: l7 -> l1 : i1^0'=0, [], cost: 2 Eliminated locations (on tree-shaped paths): Start location: l7 15: l1 -> l1 : i1^0'=1+i1^0, [ 1+i1^0<=__const_42^0 ], cost: 4 16: l1 -> l1 : i1^0'=1+i1^0, [ 1+i1^0<=__const_42^0 ], cost: 5 10: l7 -> l1 : i1^0'=0, [], cost: 2 Accelerating simple loops of location 1. [accelerate] Removed some duplicate simple loops Simplified some of the simple loops (and removed duplicate rules). Accelerating the following rules: 16: l1 -> l1 : i1^0'=1+i1^0, [ 1+i1^0<=__const_42^0 ], cost: 5 Accelerated rule 16 with backward acceleration, yielding the new rule 17. [accelerate] Nesting with 1 inner and 1 outer candidates Removing the simple loops: 16. Accelerated all simple loops using metering functions (where possible): Start location: l7 17: l1 -> l1 : i1^0'=__const_42^0, [ -i1^0+__const_42^0>=0 ], cost: -5*i1^0+5*__const_42^0 10: l7 -> l1 : i1^0'=0, [], cost: 2 Chained accelerated rules (with incoming rules): Start location: l7 10: l7 -> l1 : i1^0'=0, [], cost: 2 18: l7 -> l1 : i1^0'=__const_42^0, [ __const_42^0>=0 ], cost: 2+5*__const_42^0 Removed unreachable locations (and leaf rules with constant cost): Start location: l7 18: l7 -> l1 : i1^0'=__const_42^0, [ __const_42^0>=0 ], cost: 2+5*__const_42^0 ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: l7 18: l7 -> l1 : i1^0'=__const_42^0, [ __const_42^0>=0 ], cost: 2+5*__const_42^0 Computing asymptotic complexity for rule 18 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: [ __const_42^0==__const_42^post_10 && i1^0==i1^post_10 ] WORST_CASE(Omega(1),?)