NO ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: l4 0: l0 -> l1 : i^0'=i^post_1, j^0'=j^post_1, ret_pair5^0'=ret_pair5^post_1, [ ret_pair5^post_1==ret_pair5^post_1 && i^post_1==1+i^0 && j^post_1==2+j^0 ], cost: 1 1: l0 -> l2 : i^0'=i^post_2, j^0'=j^post_2, ret_pair5^0'=ret_pair5^post_2, [ i^0==i^post_2 && j^0==j^post_2 && ret_pair5^0==ret_pair5^post_2 ], cost: 1 2: l1 -> l0 : i^0'=i^post_3, j^0'=j^post_3, ret_pair5^0'=ret_pair5^post_3, [ i^0==i^post_3 && j^0==j^post_3 && ret_pair5^0==ret_pair5^post_3 ], cost: 1 3: l3 -> l1 : i^0'=i^post_4, j^0'=j^post_4, ret_pair5^0'=ret_pair5^post_4, [ i^post_4==0 && j^post_4==0 && ret_pair5^0==ret_pair5^post_4 ], cost: 1 4: l4 -> l3 : i^0'=i^post_5, j^0'=j^post_5, ret_pair5^0'=ret_pair5^post_5, [ i^0==i^post_5 && j^0==j^post_5 && ret_pair5^0==ret_pair5^post_5 ], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 4: l4 -> l3 : i^0'=i^post_5, j^0'=j^post_5, ret_pair5^0'=ret_pair5^post_5, [ i^0==i^post_5 && j^0==j^post_5 && ret_pair5^0==ret_pair5^post_5 ], cost: 1 Removed unreachable and leaf rules: Start location: l4 0: l0 -> l1 : i^0'=i^post_1, j^0'=j^post_1, ret_pair5^0'=ret_pair5^post_1, [ ret_pair5^post_1==ret_pair5^post_1 && i^post_1==1+i^0 && j^post_1==2+j^0 ], cost: 1 2: l1 -> l0 : i^0'=i^post_3, j^0'=j^post_3, ret_pair5^0'=ret_pair5^post_3, [ i^0==i^post_3 && j^0==j^post_3 && ret_pair5^0==ret_pair5^post_3 ], cost: 1 3: l3 -> l1 : i^0'=i^post_4, j^0'=j^post_4, ret_pair5^0'=ret_pair5^post_4, [ i^post_4==0 && j^post_4==0 && ret_pair5^0==ret_pair5^post_4 ], cost: 1 4: l4 -> l3 : i^0'=i^post_5, j^0'=j^post_5, ret_pair5^0'=ret_pair5^post_5, [ i^0==i^post_5 && j^0==j^post_5 && ret_pair5^0==ret_pair5^post_5 ], cost: 1 Simplified all rules, resulting in: Start location: l4 0: l0 -> l1 : i^0'=1+i^0, j^0'=2+j^0, ret_pair5^0'=ret_pair5^post_1, [], cost: 1 2: l1 -> l0 : [], cost: 1 3: l3 -> l1 : i^0'=0, j^0'=0, [], cost: 1 4: l4 -> l3 : [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: l4 6: l1 -> l1 : i^0'=1+i^0, j^0'=2+j^0, ret_pair5^0'=ret_pair5^post_1, [], cost: 2 5: l4 -> l1 : i^0'=0, j^0'=0, [], cost: 2 Accelerating simple loops of location 1. Accelerating the following rules: 6: l1 -> l1 : i^0'=1+i^0, j^0'=2+j^0, ret_pair5^0'=ret_pair5^post_1, [], cost: 2 Accelerated rule 6 with non-termination, yielding the new rule 7. [accelerate] Nesting with 0 inner and 0 outer candidates Removing the simple loops: 6. Accelerated all simple loops using metering functions (where possible): Start location: l4 7: l1 -> [5] : [], cost: NONTERM 5: l4 -> l1 : i^0'=0, j^0'=0, [], cost: 2 Chained accelerated rules (with incoming rules): Start location: l4 5: l4 -> l1 : i^0'=0, j^0'=0, [], cost: 2 8: l4 -> [5] : [], cost: NONTERM Removed unreachable locations (and leaf rules with constant cost): Start location: l4 8: l4 -> [5] : [], cost: NONTERM ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: l4 8: l4 -> [5] : [], cost: NONTERM Computing asymptotic complexity for rule 8 Guard is satisfiable, yielding nontermination Resulting cost NONTERM has complexity: Nonterm Found new complexity Nonterm. Obtained the following overall complexity (w.r.t. the length of the input n): Complexity: Nonterm Cpx degree: Nonterm Solved cost: NONTERM Rule cost: NONTERM Rule guard: [] NO