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, arg4'=arg4P_1, [ arg1==arg1P_1 && arg3==arg3P_1 && arg4==arg4P_1 ], cost: 1
      1: f2 -> f3 : arg1'=arg1P_2, arg2'=arg2P_2, arg3'=arg3P_2, arg4'=arg4P_2, [ arg1==arg1P_2 && arg2==arg2P_2 && arg4==arg4P_2 ], cost: 1
      2: f3 -> f4 : arg1'=arg1P_3, arg2'=arg2P_3, arg3'=arg3P_3, arg4'=arg4P_3, [ arg1==arg1P_3 && arg2==arg2P_3 && arg3==arg3P_3 ], cost: 1
      3: f4 -> f5 : arg1'=arg1P_4, arg2'=arg2P_4, arg3'=arg3P_4, arg4'=arg4P_4, [ 0==arg1P_4 && arg2==arg2P_4 && arg3==arg3P_4 && arg4==arg4P_4 ], cost: 1
     10: f5 -> f6 : arg1'=arg1P_11, arg2'=arg2P_11, arg3'=arg3P_11, arg4'=arg4P_11, [ arg2==arg3 && arg2>arg4 && arg1==arg1P_11 && arg2==arg2P_11 && arg3==arg3P_11 && arg4==arg4P_11 ], cost: 1
     12: f5 -> f12 : arg1'=arg1P_13, arg2'=arg2P_13, arg3'=arg3P_13, arg4'=arg4P_13, [ arg2<=arg4 && arg1==arg1P_13 && arg2==arg2P_13 && arg3==arg3P_13 && arg4==arg4P_13 ], cost: 1
     13: f5 -> f12 : arg1'=arg1P_14, arg2'=arg2P_14, arg3'=arg3P_14, arg4'=arg4P_14, [ arg2<arg3 && arg1==arg1P_14 && arg2==arg2P_14 && arg3==arg3P_14 && arg4==arg4P_14 ], cost: 1
     14: f5 -> f12 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, arg4'=arg4P_15, [ arg2>arg3 && arg1==arg1P_15 && arg2==arg2P_15 && arg3==arg3P_15 && arg4==arg4P_15 ], cost: 1
      4: f7 -> f8 : arg1'=arg1P_5, arg2'=arg2P_5, arg3'=arg3P_5, arg4'=arg4P_5, [ arg2P_5==-1+arg2 && arg1==arg1P_5 && arg3==arg3P_5 && arg4==arg4P_5 ], cost: 1
      5: f8 -> f9 : arg1'=arg1P_6, arg2'=arg2P_6, arg3'=arg3P_6, arg4'=arg4P_6, [ arg3P_6==-1+arg3 && arg1==arg1P_6 && arg2==arg2P_6 && arg4==arg4P_6 ], cost: 1
      6: f9 -> f10 : arg1'=arg1P_7, arg2'=arg2P_7, arg3'=arg3P_7, arg4'=arg4P_7, [ arg1P_7==1+arg1 && arg2==arg2P_7 && arg3==arg3P_7 && arg4==arg4P_7 ], cost: 1
      8: f10 -> f6 : arg1'=arg1P_9, arg2'=arg2P_9, arg3'=arg3P_9, arg4'=arg4P_9, [ arg1==arg1P_9 && arg2==arg2P_9 && arg3==arg3P_9 && arg4==arg4P_9 ], cost: 1
      7: f6 -> f7 : arg1'=arg1P_8, arg2'=arg2P_8, arg3'=arg3P_8, arg4'=arg4P_8, [ arg3>arg4 && arg1==arg1P_8 && arg2==arg2P_8 && arg3==arg3P_8 && arg4==arg4P_8 ], cost: 1
      9: f6 -> f11 : arg1'=arg1P_10, arg2'=arg2P_10, arg3'=arg3P_10, arg4'=arg4P_10, [ arg3<=arg4 && arg1==arg1P_10 && arg2==arg2P_10 && arg3==arg3P_10 && arg4==arg4P_10 ], cost: 1
     11: f11 -> f5 : arg1'=arg1P_12, arg2'=arg2P_12, arg3'=arg3P_12, arg4'=arg4P_12, [ arg1==arg1P_12 && arg2==arg2P_12 && arg3==arg3P_12 && arg4==arg4P_12 ], cost: 1
     15: __init -> f1 : arg1'=arg1P_16, arg2'=arg2P_16, arg3'=arg3P_16, arg4'=arg4P_16, [], cost: 1

Checking for constant complexity:
   The following rule is satisfiable with cost >= 1, yielding constant complexity:
     15: __init -> f1 : arg1'=arg1P_16, arg2'=arg2P_16, arg3'=arg3P_16, arg4'=arg4P_16, [], cost: 1

Removed unreachable and leaf rules:
   Start location: __init
      0: f1 -> f2 : arg1'=arg1P_1, arg2'=arg2P_1, arg3'=arg3P_1, arg4'=arg4P_1, [ arg1==arg1P_1 && arg3==arg3P_1 && arg4==arg4P_1 ], cost: 1
      1: f2 -> f3 : arg1'=arg1P_2, arg2'=arg2P_2, arg3'=arg3P_2, arg4'=arg4P_2, [ arg1==arg1P_2 && arg2==arg2P_2 && arg4==arg4P_2 ], cost: 1
      2: f3 -> f4 : arg1'=arg1P_3, arg2'=arg2P_3, arg3'=arg3P_3, arg4'=arg4P_3, [ arg1==arg1P_3 && arg2==arg2P_3 && arg3==arg3P_3 ], cost: 1
      3: f4 -> f5 : arg1'=arg1P_4, arg2'=arg2P_4, arg3'=arg3P_4, arg4'=arg4P_4, [ 0==arg1P_4 && arg2==arg2P_4 && arg3==arg3P_4 && arg4==arg4P_4 ], cost: 1
     10: f5 -> f6 : arg1'=arg1P_11, arg2'=arg2P_11, arg3'=arg3P_11, arg4'=arg4P_11, [ arg2==arg3 && arg2>arg4 && arg1==arg1P_11 && arg2==arg2P_11 && arg3==arg3P_11 && arg4==arg4P_11 ], cost: 1
      4: f7 -> f8 : arg1'=arg1P_5, arg2'=arg2P_5, arg3'=arg3P_5, arg4'=arg4P_5, [ arg2P_5==-1+arg2 && arg1==arg1P_5 && arg3==arg3P_5 && arg4==arg4P_5 ], cost: 1
      5: f8 -> f9 : arg1'=arg1P_6, arg2'=arg2P_6, arg3'=arg3P_6, arg4'=arg4P_6, [ arg3P_6==-1+arg3 && arg1==arg1P_6 && arg2==arg2P_6 && arg4==arg4P_6 ], cost: 1
      6: f9 -> f10 : arg1'=arg1P_7, arg2'=arg2P_7, arg3'=arg3P_7, arg4'=arg4P_7, [ arg1P_7==1+arg1 && arg2==arg2P_7 && arg3==arg3P_7 && arg4==arg4P_7 ], cost: 1
      8: f10 -> f6 : arg1'=arg1P_9, arg2'=arg2P_9, arg3'=arg3P_9, arg4'=arg4P_9, [ arg1==arg1P_9 && arg2==arg2P_9 && arg3==arg3P_9 && arg4==arg4P_9 ], cost: 1
      7: f6 -> f7 : arg1'=arg1P_8, arg2'=arg2P_8, arg3'=arg3P_8, arg4'=arg4P_8, [ arg3>arg4 && arg1==arg1P_8 && arg2==arg2P_8 && arg3==arg3P_8 && arg4==arg4P_8 ], cost: 1
      9: f6 -> f11 : arg1'=arg1P_10, arg2'=arg2P_10, arg3'=arg3P_10, arg4'=arg4P_10, [ arg3<=arg4 && arg1==arg1P_10 && arg2==arg2P_10 && arg3==arg3P_10 && arg4==arg4P_10 ], cost: 1
     11: f11 -> f5 : arg1'=arg1P_12, arg2'=arg2P_12, arg3'=arg3P_12, arg4'=arg4P_12, [ arg1==arg1P_12 && arg2==arg2P_12 && arg3==arg3P_12 && arg4==arg4P_12 ], cost: 1
     15: __init -> f1 : arg1'=arg1P_16, arg2'=arg2P_16, arg3'=arg3P_16, arg4'=arg4P_16, [], cost: 1

Simplified all rules, resulting in:
   Start location: __init
      0: f1 -> f2 : arg2'=arg2P_1, [], cost: 1
      1: f2 -> f3 : arg3'=arg3P_2, [], cost: 1
      2: f3 -> f4 : arg4'=arg4P_3, [], cost: 1
      3: f4 -> f5 : arg1'=0, [], cost: 1
     10: f5 -> f6 : [ arg2==arg3 && arg2>arg4 ], cost: 1
      4: f7 -> f8 : arg2'=-1+arg2, [], cost: 1
      5: f8 -> f9 : arg3'=-1+arg3, [], cost: 1
      6: f9 -> f10 : arg1'=1+arg1, [], cost: 1
      8: f10 -> f6 : [], cost: 1
      7: f6 -> f7 : [ arg3>arg4 ], cost: 1
      9: f6 -> f11 : [ arg3<=arg4 ], cost: 1
     11: f11 -> f5 : [], cost: 1
     15: __init -> f1 : arg1'=arg1P_16, arg2'=arg2P_16, arg3'=arg3P_16, arg4'=arg4P_16, [], cost: 1

### Simplification by acceleration and chaining ###

Eliminated locations (on linear paths):
   Start location: __init
     10: f5 -> f6 : [ arg2==arg3 && arg2>arg4 ], cost: 1
     21: f6 -> f5 : [ arg3<=arg4 ], cost: 2
     24: f6 -> f6 : arg1'=1+arg1, arg2'=-1+arg2, arg3'=-1+arg3, [ arg3>arg4 ], cost: 5
     19: __init -> f5 : arg1'=0, arg2'=arg2P_1, arg3'=arg3P_2, arg4'=arg4P_3, [], cost: 5

Accelerating simple loops of location 9.
   Accelerating the following rules:
     24: f6 -> f6 : arg1'=1+arg1, arg2'=-1+arg2, arg3'=-1+arg3, [ arg3>arg4 ], cost: 5

   Accelerated rule 24 with backward acceleration, yielding the new rule 25.
[accelerate] Nesting with 1 inner and 1 outer candidates
   Removing the simple loops: 24.

Accelerated all simple loops using metering functions (where possible):
   Start location: __init
     10: f5 -> f6 : [ arg2==arg3 && arg2>arg4 ], cost: 1
     21: f6 -> f5 : [ arg3<=arg4 ], cost: 2
     25: f6 -> f6 : arg1'=arg3-arg4+arg1, arg2'=arg2-arg3+arg4, arg3'=arg4, [ arg3-arg4>=0 ], cost: 5*arg3-5*arg4
     19: __init -> f5 : arg1'=0, arg2'=arg2P_1, arg3'=arg3P_2, arg4'=arg4P_3, [], cost: 5

Chained accelerated rules (with incoming rules):
   Start location: __init
     10: f5 -> f6 : [ arg2==arg3 && arg2>arg4 ], cost: 1
     26: f5 -> f6 : arg1'=arg3-arg4+arg1, arg2'=arg2-arg3+arg4, arg3'=arg4, [ arg2==arg3 && arg2>arg4 && arg3-arg4>=0 ], cost: 1+5*arg3-5*arg4
     21: f6 -> f5 : [ arg3<=arg4 ], cost: 2
     19: __init -> f5 : arg1'=0, arg2'=arg2P_1, arg3'=arg3P_2, arg4'=arg4P_3, [], cost: 5

Eliminated locations (on tree-shaped paths):
   Start location: __init
     27: f5 -> f5 : arg1'=arg3-arg4+arg1, arg2'=arg2-arg3+arg4, arg3'=arg4, [ arg2==arg3 && arg2>arg4 && arg3-arg4>=0 ], cost: 3+5*arg3-5*arg4
     19: __init -> f5 : arg1'=0, arg2'=arg2P_1, arg3'=arg3P_2, arg4'=arg4P_3, [], cost: 5

Accelerating simple loops of location 4.
   Accelerating the following rules:
     27: f5 -> f5 : arg1'=arg3-arg4+arg1, arg2'=arg2-arg3+arg4, arg3'=arg4, [ arg2==arg3 && arg2>arg4 && arg3-arg4>=0 ], cost: 3+5*arg3-5*arg4

   Failed to prove monotonicity of the guard of rule 27.
[accelerate] Nesting with 1 inner and 1 outer candidates

Accelerated all simple loops using metering functions (where possible):
   Start location: __init
     27: f5 -> f5 : arg1'=arg3-arg4+arg1, arg2'=arg2-arg3+arg4, arg3'=arg4, [ arg2==arg3 && arg2>arg4 && arg3-arg4>=0 ], cost: 3+5*arg3-5*arg4
     19: __init -> f5 : arg1'=0, arg2'=arg2P_1, arg3'=arg3P_2, arg4'=arg4P_3, [], cost: 5

Chained accelerated rules (with incoming rules):
   Start location: __init
     19: __init -> f5 : arg1'=0, arg2'=arg2P_1, arg3'=arg3P_2, arg4'=arg4P_3, [], cost: 5
     28: __init -> f5 : arg1'=-arg4P_3+arg2P_1, arg2'=arg4P_3, arg3'=arg4P_3, arg4'=arg4P_3, [ arg2P_1>arg4P_3 ], cost: 8-5*arg4P_3+5*arg2P_1

Removed unreachable locations (and leaf rules with constant cost):
   Start location: __init
     28: __init -> f5 : arg1'=-arg4P_3+arg2P_1, arg2'=arg4P_3, arg3'=arg4P_3, arg4'=arg4P_3, [ arg2P_1>arg4P_3 ], cost: 8-5*arg4P_3+5*arg2P_1

### Computing asymptotic complexity ###

Fully simplified ITS problem
   Start location: __init
     28: __init -> f5 : arg1'=-arg4P_3+arg2P_1, arg2'=arg4P_3, arg3'=arg4P_3, arg4'=arg4P_3, [ arg2P_1>arg4P_3 ], cost: 8-5*arg4P_3+5*arg2P_1

Computing asymptotic complexity for rule 28
   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),?)