NO ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: l6 0: l0 -> l1 : len^0'=len^post_1, tmp^0'=tmp^post_1, [ len^post_1==1+len^0 && tmp^0==tmp^post_1 ], cost: 1 7: l1 -> l3 : len^0'=len^post_8, tmp^0'=tmp^post_8, [ tmp^post_8==tmp^post_8 && len^0==len^post_8 ], cost: 1 1: l2 -> l0 : len^0'=len^post_2, tmp^0'=tmp^post_2, [ 5<=len^0 && len^0==len^post_2 && tmp^0==tmp^post_2 ], cost: 1 2: l2 -> l0 : len^0'=len^post_3, tmp^0'=tmp^post_3, [ 1+len^0<=4 && len^0==len^post_3 && tmp^0==tmp^post_3 ], cost: 1 3: l2 -> l0 : len^0'=len^post_4, tmp^0'=tmp^post_4, [ len^0<=4 && 4<=len^0 && len^post_4==0 && tmp^0==tmp^post_4 ], cost: 1 4: l3 -> l4 : len^0'=len^post_5, tmp^0'=tmp^post_5, [ tmp^0<=0 && 0<=tmp^0 && len^0==len^post_5 && tmp^0==tmp^post_5 ], cost: 1 5: l3 -> l2 : len^0'=len^post_6, tmp^0'=tmp^post_6, [ 1<=tmp^0 && len^0==len^post_6 && tmp^0==tmp^post_6 ], cost: 1 6: l3 -> l2 : len^0'=len^post_7, tmp^0'=tmp^post_7, [ 1+tmp^0<=0 && len^0==len^post_7 && tmp^0==tmp^post_7 ], cost: 1 8: l5 -> l1 : len^0'=len^post_9, tmp^0'=tmp^post_9, [ len^post_9==0 && tmp^0==tmp^post_9 ], cost: 1 9: l6 -> l5 : len^0'=len^post_10, tmp^0'=tmp^post_10, [ len^0==len^post_10 && tmp^0==tmp^post_10 ], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 9: l6 -> l5 : len^0'=len^post_10, tmp^0'=tmp^post_10, [ len^0==len^post_10 && tmp^0==tmp^post_10 ], cost: 1 Removed unreachable and leaf rules: Start location: l6 0: l0 -> l1 : len^0'=len^post_1, tmp^0'=tmp^post_1, [ len^post_1==1+len^0 && tmp^0==tmp^post_1 ], cost: 1 7: l1 -> l3 : len^0'=len^post_8, tmp^0'=tmp^post_8, [ tmp^post_8==tmp^post_8 && len^0==len^post_8 ], cost: 1 1: l2 -> l0 : len^0'=len^post_2, tmp^0'=tmp^post_2, [ 5<=len^0 && len^0==len^post_2 && tmp^0==tmp^post_2 ], cost: 1 2: l2 -> l0 : len^0'=len^post_3, tmp^0'=tmp^post_3, [ 1+len^0<=4 && len^0==len^post_3 && tmp^0==tmp^post_3 ], cost: 1 3: l2 -> l0 : len^0'=len^post_4, tmp^0'=tmp^post_4, [ len^0<=4 && 4<=len^0 && len^post_4==0 && tmp^0==tmp^post_4 ], cost: 1 5: l3 -> l2 : len^0'=len^post_6, tmp^0'=tmp^post_6, [ 1<=tmp^0 && len^0==len^post_6 && tmp^0==tmp^post_6 ], cost: 1 6: l3 -> l2 : len^0'=len^post_7, tmp^0'=tmp^post_7, [ 1+tmp^0<=0 && len^0==len^post_7 && tmp^0==tmp^post_7 ], cost: 1 8: l5 -> l1 : len^0'=len^post_9, tmp^0'=tmp^post_9, [ len^post_9==0 && tmp^0==tmp^post_9 ], cost: 1 9: l6 -> l5 : len^0'=len^post_10, tmp^0'=tmp^post_10, [ len^0==len^post_10 && tmp^0==tmp^post_10 ], cost: 1 Simplified all rules, resulting in: Start location: l6 0: l0 -> l1 : len^0'=1+len^0, [], cost: 1 7: l1 -> l3 : tmp^0'=tmp^post_8, [], cost: 1 1: l2 -> l0 : [ 5<=len^0 ], cost: 1 2: l2 -> l0 : [ 1+len^0<=4 ], cost: 1 3: l2 -> l0 : len^0'=0, [ -4+len^0==0 ], cost: 1 5: l3 -> l2 : [ 1<=tmp^0 ], cost: 1 6: l3 -> l2 : [ 1+tmp^0<=0 ], cost: 1 8: l5 -> l1 : len^0'=0, [], cost: 1 9: l6 -> l5 : [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: l6 0: l0 -> l1 : len^0'=1+len^0, [], cost: 1 7: l1 -> l3 : tmp^0'=tmp^post_8, [], cost: 1 1: l2 -> l0 : [ 5<=len^0 ], cost: 1 2: l2 -> l0 : [ 1+len^0<=4 ], cost: 1 3: l2 -> l0 : len^0'=0, [ -4+len^0==0 ], cost: 1 5: l3 -> l2 : [ 1<=tmp^0 ], cost: 1 6: l3 -> l2 : [ 1+tmp^0<=0 ], cost: 1 10: l6 -> l1 : len^0'=0, [], cost: 2 Eliminated locations (on tree-shaped paths): Start location: l6 11: l1 -> l2 : tmp^0'=tmp^post_8, [ 1<=tmp^post_8 ], cost: 2 12: l1 -> l2 : tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 ], cost: 2 13: l2 -> l1 : len^0'=1+len^0, [ 5<=len^0 ], cost: 2 14: l2 -> l1 : len^0'=1+len^0, [ 1+len^0<=4 ], cost: 2 15: l2 -> l1 : len^0'=1, [ -4+len^0==0 ], cost: 2 10: l6 -> l1 : len^0'=0, [], cost: 2 Eliminated locations (on tree-shaped paths): Start location: l6 16: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && 5<=len^0 ], cost: 4 17: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && 1+len^0<=4 ], cost: 4 18: l1 -> l1 : len^0'=1, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && -4+len^0==0 ], cost: 4 19: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && 5<=len^0 ], cost: 4 20: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && 1+len^0<=4 ], cost: 4 21: l1 -> l1 : len^0'=1, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && -4+len^0==0 ], cost: 4 10: l6 -> l1 : len^0'=0, [], cost: 2 Accelerating simple loops of location 1. Accelerating the following rules: 16: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && 5<=len^0 ], cost: 4 17: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && 1+len^0<=4 ], cost: 4 18: l1 -> l1 : len^0'=1, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && -4+len^0==0 ], cost: 4 19: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && 5<=len^0 ], cost: 4 20: l1 -> l1 : len^0'=1+len^0, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && 1+len^0<=4 ], cost: 4 21: l1 -> l1 : len^0'=1, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && -4+len^0==0 ], cost: 4 Accelerated rule 16 with NONTERM, yielding the new rule 22. Accelerated rule 17 with metering function 4-len^0, yielding the new rule 23. Accelerated rule 18 with metering function meter (where 3*meter==-3+len^0), yielding the new rule 24. Accelerated rule 19 with NONTERM, yielding the new rule 25. Accelerated rule 20 with metering function 4-len^0, yielding the new rule 26. Accelerated rule 21 with metering function meter_1 (where 3*meter_1==-3+len^0), yielding the new rule 27. Nested simple loops 18 (outer loop) and 23 (inner loop) with NONTERM, resulting in the new rules: 28, 29. Nested simple loops 21 (outer loop) and 26 (inner loop) with NONTERM, resulting in the new rules: 30, 31. Removing the simple loops: 16 17 18 19 20 21. Accelerated all simple loops using metering functions (where possible): Start location: l6 22: l1 -> [7] : [ 1<=tmp^post_8 && 5<=len^0 ], cost: NONTERM 23: l1 -> l1 : len^0'=4, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && 1+len^0<=4 ], cost: 16-4*len^0 24: l1 -> l1 : len^0'=1, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && -4+len^0==0 && 3*meter==-3+len^0 && meter>=1 ], cost: 4*meter 25: l1 -> [7] : [ 1+tmp^post_8<=0 && 5<=len^0 ], cost: NONTERM 26: l1 -> l1 : len^0'=4, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && 1+len^0<=4 ], cost: 16-4*len^0 27: l1 -> l1 : len^0'=1, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && -4+len^0==0 && 3*meter_1==-3+len^0 && meter_1>=1 ], cost: 4*meter_1 28: l1 -> [7] : [ 1<=tmp^post_8 && 1+len^0<=4 && 20-4*len^0>=1 ], cost: NONTERM 29: l1 -> [7] : len^0'=1, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 && -4+len^0==0 ], cost: NONTERM 30: l1 -> [7] : [ 1+tmp^post_8<=0 && 1+len^0<=4 && 20-4*len^0>=1 ], cost: NONTERM 31: l1 -> [7] : len^0'=1, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 && -4+len^0==0 ], cost: NONTERM 10: l6 -> l1 : len^0'=0, [], cost: 2 Chained accelerated rules (with incoming rules): Start location: l6 10: l6 -> l1 : len^0'=0, [], cost: 2 32: l6 -> l1 : len^0'=4, tmp^0'=tmp^post_8, [ 1<=tmp^post_8 ], cost: 18 33: l6 -> l1 : len^0'=4, tmp^0'=tmp^post_8, [ 1+tmp^post_8<=0 ], cost: 18 34: l6 -> [7] : len^0'=0, [], cost: NONTERM 35: l6 -> [7] : len^0'=0, [], cost: NONTERM Removed unreachable locations (and leaf rules with constant cost): Start location: l6 34: l6 -> [7] : len^0'=0, [], cost: NONTERM 35: l6 -> [7] : len^0'=0, [], cost: NONTERM ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: l6 35: l6 -> [7] : len^0'=0, [], cost: NONTERM Computing asymptotic complexity for rule 35 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