WORST_CASE(Omega(n^1),?) ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: l7 0: l0 -> l1 : Result^0'=Result^post_1, x^0'=x^post_1, y^0'=y^post_1, [ -x^0<=0 && Result^post_1==Result^post_1 && x^0==x^post_1 && y^0==y^post_1 ], cost: 1 1: l0 -> l3 : Result^0'=Result^post_2, x^0'=x^post_2, y^0'=y^post_2, [ 0<=-1-x^0 && Result^0==Result^post_2 && x^0==x^post_2 && y^0==y^post_2 ], cost: 1 6: l0 -> l5 : Result^0'=Result^post_7, x^0'=x^post_7, y^0'=y^post_7, [ 0<=-1-x^0 && y^0<=-1 && -1<=y^0 && y^post_7==1+y^0 && x^post_7==-99+x^0 && Result^0==Result^post_7 ], cost: 1 2: l3 -> l4 : Result^0'=Result^post_3, x^0'=x^post_3, y^0'=y^post_3, [ 1+y^0<=-1 && Result^0==Result^post_3 && x^0==x^post_3 && y^0==y^post_3 ], cost: 1 3: l3 -> l4 : Result^0'=Result^post_4, x^0'=x^post_4, y^0'=y^post_4, [ 0<=y^0 && Result^0==Result^post_4 && x^0==x^post_4 && y^0==y^post_4 ], cost: 1 4: l4 -> l2 : Result^0'=Result^post_5, x^0'=x^post_5, y^0'=y^post_5, [ x^post_5==1+x^0 && y^post_5==1+y^0 && Result^0==Result^post_5 ], cost: 1 5: l2 -> l0 : Result^0'=Result^post_6, x^0'=x^post_6, y^0'=y^post_6, [ Result^0==Result^post_6 && x^0==x^post_6 && y^0==y^post_6 ], cost: 1 7: l5 -> l0 : Result^0'=Result^post_8, x^0'=x^post_8, y^0'=y^post_8, [ Result^0==Result^post_8 && x^0==x^post_8 && y^0==y^post_8 ], cost: 1 8: l6 -> l0 : Result^0'=Result^post_9, x^0'=x^post_9, y^0'=y^post_9, [ Result^0==Result^post_9 && x^0==x^post_9 && y^0==y^post_9 ], cost: 1 9: l7 -> l6 : Result^0'=Result^post_10, x^0'=x^post_10, y^0'=y^post_10, [ Result^0==Result^post_10 && x^0==x^post_10 && y^0==y^post_10 ], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 9: l7 -> l6 : Result^0'=Result^post_10, x^0'=x^post_10, y^0'=y^post_10, [ Result^0==Result^post_10 && x^0==x^post_10 && y^0==y^post_10 ], cost: 1 Removed unreachable and leaf rules: Start location: l7 1: l0 -> l3 : Result^0'=Result^post_2, x^0'=x^post_2, y^0'=y^post_2, [ 0<=-1-x^0 && Result^0==Result^post_2 && x^0==x^post_2 && y^0==y^post_2 ], cost: 1 6: l0 -> l5 : Result^0'=Result^post_7, x^0'=x^post_7, y^0'=y^post_7, [ 0<=-1-x^0 && y^0<=-1 && -1<=y^0 && y^post_7==1+y^0 && x^post_7==-99+x^0 && Result^0==Result^post_7 ], cost: 1 2: l3 -> l4 : Result^0'=Result^post_3, x^0'=x^post_3, y^0'=y^post_3, [ 1+y^0<=-1 && Result^0==Result^post_3 && x^0==x^post_3 && y^0==y^post_3 ], cost: 1 3: l3 -> l4 : Result^0'=Result^post_4, x^0'=x^post_4, y^0'=y^post_4, [ 0<=y^0 && Result^0==Result^post_4 && x^0==x^post_4 && y^0==y^post_4 ], cost: 1 4: l4 -> l2 : Result^0'=Result^post_5, x^0'=x^post_5, y^0'=y^post_5, [ x^post_5==1+x^0 && y^post_5==1+y^0 && Result^0==Result^post_5 ], cost: 1 5: l2 -> l0 : Result^0'=Result^post_6, x^0'=x^post_6, y^0'=y^post_6, [ Result^0==Result^post_6 && x^0==x^post_6 && y^0==y^post_6 ], cost: 1 7: l5 -> l0 : Result^0'=Result^post_8, x^0'=x^post_8, y^0'=y^post_8, [ Result^0==Result^post_8 && x^0==x^post_8 && y^0==y^post_8 ], cost: 1 8: l6 -> l0 : Result^0'=Result^post_9, x^0'=x^post_9, y^0'=y^post_9, [ Result^0==Result^post_9 && x^0==x^post_9 && y^0==y^post_9 ], cost: 1 9: l7 -> l6 : Result^0'=Result^post_10, x^0'=x^post_10, y^0'=y^post_10, [ Result^0==Result^post_10 && x^0==x^post_10 && y^0==y^post_10 ], cost: 1 Simplified all rules, resulting in: Start location: l7 1: l0 -> l3 : [ 0<=-1-x^0 ], cost: 1 6: l0 -> l5 : x^0'=-99+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 1 2: l3 -> l4 : [ 1+y^0<=-1 ], cost: 1 3: l3 -> l4 : [ 0<=y^0 ], cost: 1 4: l4 -> l2 : x^0'=1+x^0, y^0'=1+y^0, [], cost: 1 5: l2 -> l0 : [], cost: 1 7: l5 -> l0 : [], cost: 1 8: l6 -> l0 : [], cost: 1 9: l7 -> l6 : [], cost: 1 ### Simplification by acceleration and chaining ### Eliminated locations (on linear paths): Start location: l7 1: l0 -> l3 : [ 0<=-1-x^0 ], cost: 1 11: l0 -> l0 : x^0'=-99+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2 2: l3 -> l4 : [ 1+y^0<=-1 ], cost: 1 3: l3 -> l4 : [ 0<=y^0 ], cost: 1 12: l4 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [], cost: 2 10: l7 -> l0 : [], cost: 2 Accelerating simple loops of location 0. Accelerating the following rules: 11: l0 -> l0 : x^0'=-99+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2 Accelerated rule 11 with metering function -y^0, yielding the new rule 13. Removing the simple loops: 11. Accelerated all simple loops using metering functions (where possible): Start location: l7 1: l0 -> l3 : [ 0<=-1-x^0 ], cost: 1 13: l0 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: -2*y^0 2: l3 -> l4 : [ 1+y^0<=-1 ], cost: 1 3: l3 -> l4 : [ 0<=y^0 ], cost: 1 12: l4 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [], cost: 2 10: l7 -> l0 : [], cost: 2 Chained accelerated rules (with incoming rules): Start location: l7 1: l0 -> l3 : [ 0<=-1-x^0 ], cost: 1 2: l3 -> l4 : [ 1+y^0<=-1 ], cost: 1 3: l3 -> l4 : [ 0<=y^0 ], cost: 1 12: l4 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [], cost: 2 15: l4 -> l0 : x^0'=100+99*y^0+x^0, y^0'=0, [ 0<=-2-x^0 && 2+y^0==0 ], cost: -2*y^0 10: l7 -> l0 : [], cost: 2 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 Eliminated locations (on tree-shaped paths): Start location: l7 16: l0 -> l4 : [ 0<=-1-x^0 && 1+y^0<=-1 ], cost: 2 17: l0 -> l4 : [ 0<=-1-x^0 && 0<=y^0 ], cost: 2 12: l4 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [], cost: 2 15: l4 -> l0 : x^0'=100+99*y^0+x^0, y^0'=0, [ 0<=-2-x^0 && 2+y^0==0 ], cost: -2*y^0 10: l7 -> l0 : [], cost: 2 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 Eliminated locations (on tree-shaped paths): Start location: l7 18: l0 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 1+y^0<=-1 ], cost: 4 19: l0 -> l0 : x^0'=100+99*y^0+x^0, y^0'=0, [ 0<=-2-x^0 && 2+y^0==0 ], cost: 2-2*y^0 20: l0 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 0<=y^0 ], cost: 4 10: l7 -> l0 : [], cost: 2 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 Accelerating simple loops of location 0. Accelerating the following rules: 18: l0 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 1+y^0<=-1 ], cost: 4 19: l0 -> l0 : x^0'=100+99*y^0+x^0, y^0'=0, [ 0<=-2-x^0 && 2+y^0==0 ], cost: 2-2*y^0 20: l0 -> l0 : x^0'=1+x^0, y^0'=1+y^0, [ 0<=-1-x^0 && 0<=y^0 ], cost: 4 Accelerated rule 18 with metering function -1-x^0 (after adding x^0>=y^0), yielding the new rule 21. Accelerated rule 18 with metering function -1-y^0 (after adding x^0<=y^0), yielding the new rule 22. Accelerated rule 19 with metering function meter (where 2*meter==-1-y^0), yielding the new rule 23. Accelerated rule 20 with metering function -x^0, yielding the new rule 24. Removing the simple loops: 18 19 20. Accelerated all simple loops using metering functions (where possible): Start location: l7 21: l0 -> l0 : x^0'=-1, y^0'=-1+y^0-x^0, [ 1+y^0<=-1 && x^0>=y^0 && -1-x^0>=1 ], cost: -4-4*x^0 22: l0 -> l0 : x^0'=-1-y^0+x^0, y^0'=-1, [ 0<=-1-x^0 && 1+y^0<=-1 && x^0<=y^0 ], cost: -4-4*y^0 23: l0 -> l0 : x^0'=99*y^0+100*meter+x^0, y^0'=0, [ 0<=-2-x^0 && 2+y^0==0 && 2*meter==-1-y^0 && meter>=1 ], cost: 2*meter 24: l0 -> l0 : x^0'=0, y^0'=y^0-x^0, [ 0<=-1-x^0 && 0<=y^0 ], cost: -4*x^0 10: l7 -> l0 : [], cost: 2 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 Chained accelerated rules (with incoming rules): Start location: l7 10: l7 -> l0 : [], cost: 2 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 25: l7 -> l0 : x^0'=-1, y^0'=-1+y^0-x^0, [ 1+y^0<=-1 && x^0>=y^0 && -1-x^0>=1 ], cost: -2-4*x^0 26: l7 -> l0 : x^0'=-1-y^0+x^0, y^0'=-1, [ 0<=-1-x^0 && 1+y^0<=-1 && x^0<=y^0 ], cost: -2-4*y^0 27: l7 -> l0 : x^0'=0, y^0'=y^0-x^0, [ 0<=-1-x^0 && 0<=y^0 ], cost: 2-4*x^0 28: l7 -> l0 : x^0'=0, y^0'=-99*y^0-x^0, [ 0<=-1-x^0 && 1+y^0==0 && 0<=-1-99*y^0-x^0 ], cost: 2-398*y^0-4*x^0 Removed unreachable locations (and leaf rules with constant cost): Start location: l7 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 25: l7 -> l0 : x^0'=-1, y^0'=-1+y^0-x^0, [ 1+y^0<=-1 && x^0>=y^0 && -1-x^0>=1 ], cost: -2-4*x^0 26: l7 -> l0 : x^0'=-1-y^0+x^0, y^0'=-1, [ 0<=-1-x^0 && 1+y^0<=-1 && x^0<=y^0 ], cost: -2-4*y^0 27: l7 -> l0 : x^0'=0, y^0'=y^0-x^0, [ 0<=-1-x^0 && 0<=y^0 ], cost: 2-4*x^0 28: l7 -> l0 : x^0'=0, y^0'=-99*y^0-x^0, [ 0<=-1-x^0 && 1+y^0==0 && 0<=-1-99*y^0-x^0 ], cost: 2-398*y^0-4*x^0 ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: l7 14: l7 -> l0 : x^0'=99*y^0+x^0, y^0'=0, [ 0<=-1-x^0 && 1+y^0==0 ], cost: 2-2*y^0 25: l7 -> l0 : x^0'=-1, y^0'=-1+y^0-x^0, [ 1+y^0<=-1 && x^0>=y^0 && -1-x^0>=1 ], cost: -2-4*x^0 26: l7 -> l0 : x^0'=-1-y^0+x^0, y^0'=-1, [ 0<=-1-x^0 && 1+y^0<=-1 && x^0<=y^0 ], cost: -2-4*y^0 27: l7 -> l0 : x^0'=0, y^0'=y^0-x^0, [ 0<=-1-x^0 && 0<=y^0 ], cost: 2-4*x^0 28: l7 -> l0 : x^0'=0, y^0'=-99*y^0-x^0, [ 0<=-1-x^0 && 1+y^0==0 && 0<=-1-99*y^0-x^0 ], cost: 2-398*y^0-4*x^0 Computing asymptotic complexity for rule 14 Could not solve the limit problem. Resulting cost 0 has complexity: Unknown Computing asymptotic complexity for rule 25 Simplified the guard: 25: l7 -> l0 : x^0'=-1, y^0'=-1+y^0-x^0, [ x^0>=y^0 && -1-x^0>=1 ], cost: -2-4*x^0 Solved the limit problem by the following transformations: Created initial limit problem: 1-y^0+x^0 (+/+!), -2-4*x^0 (+), -1-x^0 (+/+!) [not solved] removing all constraints (solved by SMT) resulting limit problem: [solved] applying transformation rule (C) using substitution {y^0==-n,x^0==-n} resulting limit problem: [solved] Solution: y^0 / -n x^0 / -n Resulting cost -2+4*n has complexity: Poly(n^1) Found new complexity Poly(n^1). Obtained the following overall complexity (w.r.t. the length of the input n): Complexity: Poly(n^1) Cpx degree: 1 Solved cost: -2+4*n Rule cost: -2-4*x^0 Rule guard: [ x^0>=y^0 && -1-x^0>=1 ] WORST_CASE(Omega(n^1),?)