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, [ arg2==arg2P_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 && arg3==arg3P_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 && arg4==arg4P_3 ], cost: 1
      3: f4 -> f5 : arg1'=arg1P_4, arg2'=arg2P_4, arg3'=arg3P_4, arg4'=arg4P_4, [ arg1==arg1P_4 && arg2==arg2P_4 && arg3==arg3P_4 ], cost: 1
      6: f5 -> f6 : arg1'=arg1P_7, arg2'=arg2P_7, arg3'=arg3P_7, arg4'=arg4P_7, [ arg1<arg3 && arg1==arg1P_7 && arg2==arg2P_7 && arg3==arg3P_7 && arg4==arg4P_7 ], cost: 1
      8: f5 -> f9 : arg1'=arg1P_9, arg2'=arg2P_9, arg3'=arg3P_9, arg4'=arg4P_9, [ arg1>=arg3 && arg1==arg1P_9 && arg2==arg2P_9 && arg3==arg3P_9 && arg4==arg4P_9 ], cost: 1
      4: f6 -> f7 : 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: f7 -> f8 : arg1'=arg1P_6, arg2'=arg2P_6, arg3'=arg3P_6, arg4'=arg4P_6, [ arg1P_6==1+arg1 && arg2==arg2P_6 && arg3==arg3P_6 && arg4==arg4P_6 ], cost: 1
      7: f8 -> f5 : arg1'=arg1P_8, arg2'=arg2P_8, arg3'=arg3P_8, arg4'=arg4P_8, [ arg1==arg1P_8 && arg2==arg2P_8 && arg3==arg3P_8 && arg4==arg4P_8 ], cost: 1
     11: f9 -> f10 : arg1'=arg1P_12, arg2'=arg2P_12, arg3'=arg3P_12, arg4'=arg4P_12, [ arg1<arg4 && arg1==arg1P_12 && arg2==arg2P_12 && arg3==arg3P_12 && arg4==arg4P_12 ], cost: 1
     13: f9 -> f13 : arg1'=arg1P_14, arg2'=arg2P_14, arg3'=arg3P_14, arg4'=arg4P_14, [ arg1>=arg4 && arg1==arg1P_14 && arg2==arg2P_14 && arg3==arg3P_14 && arg4==arg4P_14 ], cost: 1
      9: f10 -> f11 : arg1'=arg1P_10, arg2'=arg2P_10, arg3'=arg3P_10, arg4'=arg4P_10, [ arg2P_10==1+arg2 && arg1==arg1P_10 && arg3==arg3P_10 && arg4==arg4P_10 ], cost: 1
     10: f11 -> f12 : arg1'=arg1P_11, arg2'=arg2P_11, arg3'=arg3P_11, arg4'=arg4P_11, [ arg1P_11==1+arg1 && arg2==arg2P_11 && arg3==arg3P_11 && arg4==arg4P_11 ], cost: 1
     12: f12 -> f9 : arg1'=arg1P_13, arg2'=arg2P_13, arg3'=arg3P_13, arg4'=arg4P_13, [ arg1==arg1P_13 && arg2==arg2P_13 && arg3==arg3P_13 && arg4==arg4P_13 ], cost: 1
     14: __init -> f1 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, arg4'=arg4P_15, [], cost: 1

Checking for constant complexity:
   The following rule is satisfiable with cost >= 1, yielding constant complexity:
     14: __init -> f1 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, arg4'=arg4P_15, [], 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, [ arg2==arg2P_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 && arg3==arg3P_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 && arg4==arg4P_3 ], cost: 1
      3: f4 -> f5 : arg1'=arg1P_4, arg2'=arg2P_4, arg3'=arg3P_4, arg4'=arg4P_4, [ arg1==arg1P_4 && arg2==arg2P_4 && arg3==arg3P_4 ], cost: 1
      6: f5 -> f6 : arg1'=arg1P_7, arg2'=arg2P_7, arg3'=arg3P_7, arg4'=arg4P_7, [ arg1<arg3 && arg1==arg1P_7 && arg2==arg2P_7 && arg3==arg3P_7 && arg4==arg4P_7 ], cost: 1
      8: f5 -> f9 : arg1'=arg1P_9, arg2'=arg2P_9, arg3'=arg3P_9, arg4'=arg4P_9, [ arg1>=arg3 && arg1==arg1P_9 && arg2==arg2P_9 && arg3==arg3P_9 && arg4==arg4P_9 ], cost: 1
      4: f6 -> f7 : 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: f7 -> f8 : arg1'=arg1P_6, arg2'=arg2P_6, arg3'=arg3P_6, arg4'=arg4P_6, [ arg1P_6==1+arg1 && arg2==arg2P_6 && arg3==arg3P_6 && arg4==arg4P_6 ], cost: 1
      7: f8 -> f5 : arg1'=arg1P_8, arg2'=arg2P_8, arg3'=arg3P_8, arg4'=arg4P_8, [ arg1==arg1P_8 && arg2==arg2P_8 && arg3==arg3P_8 && arg4==arg4P_8 ], cost: 1
     11: f9 -> f10 : arg1'=arg1P_12, arg2'=arg2P_12, arg3'=arg3P_12, arg4'=arg4P_12, [ arg1<arg4 && arg1==arg1P_12 && arg2==arg2P_12 && arg3==arg3P_12 && arg4==arg4P_12 ], cost: 1
      9: f10 -> f11 : arg1'=arg1P_10, arg2'=arg2P_10, arg3'=arg3P_10, arg4'=arg4P_10, [ arg2P_10==1+arg2 && arg1==arg1P_10 && arg3==arg3P_10 && arg4==arg4P_10 ], cost: 1
     10: f11 -> f12 : arg1'=arg1P_11, arg2'=arg2P_11, arg3'=arg3P_11, arg4'=arg4P_11, [ arg1P_11==1+arg1 && arg2==arg2P_11 && arg3==arg3P_11 && arg4==arg4P_11 ], cost: 1
     12: f12 -> f9 : arg1'=arg1P_13, arg2'=arg2P_13, arg3'=arg3P_13, arg4'=arg4P_13, [ arg1==arg1P_13 && arg2==arg2P_13 && arg3==arg3P_13 && arg4==arg4P_13 ], cost: 1
     14: __init -> f1 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, arg4'=arg4P_15, [], cost: 1

Simplified all rules, resulting in:
   Start location: __init
      0: f1 -> f2 : arg1'=arg1P_1, [], cost: 1
      1: f2 -> f3 : arg2'=arg2P_2, [], cost: 1
      2: f3 -> f4 : arg3'=arg3P_3, [], cost: 1
      3: f4 -> f5 : arg4'=arg4P_4, [], cost: 1
      6: f5 -> f6 : [ arg1<arg3 ], cost: 1
      8: f5 -> f9 : [ arg1>=arg3 ], cost: 1
      4: f6 -> f7 : arg2'=1+arg2, [], cost: 1
      5: f7 -> f8 : arg1'=1+arg1, [], cost: 1
      7: f8 -> f5 : [], cost: 1
     11: f9 -> f10 : [ arg1<arg4 ], cost: 1
      9: f10 -> f11 : arg2'=1+arg2, [], cost: 1
     10: f11 -> f12 : arg1'=1+arg1, [], cost: 1
     12: f12 -> f9 : [], cost: 1
     14: __init -> f1 : arg1'=arg1P_15, arg2'=arg2P_15, arg3'=arg3P_15, arg4'=arg4P_15, [], cost: 1

### Simplification by acceleration and chaining ###

Eliminated locations (on linear paths):
   Start location: __init
      8: f5 -> f9 : [ arg1>=arg3 ], cost: 1
     21: f5 -> f5 : arg1'=1+arg1, arg2'=1+arg2, [ arg1<arg3 ], cost: 4
     24: f9 -> f9 : arg1'=1+arg1, arg2'=1+arg2, [ arg1<arg4 ], cost: 4
     18: __init -> f5 : arg1'=arg1P_1, arg2'=arg2P_2, arg3'=arg3P_3, arg4'=arg4P_4, [], cost: 5

Accelerating simple loops of location 4.
   Accelerating the following rules:
     21: f5 -> f5 : arg1'=1+arg1, arg2'=1+arg2, [ arg1<arg3 ], cost: 4

   Accelerated rule 21 with backward acceleration, yielding the new rule 25.
[accelerate] Nesting with 1 inner and 1 outer candidates
   Removing the simple loops: 21.

Accelerating simple loops of location 8.
   Accelerating the following rules:
     24: f9 -> f9 : arg1'=1+arg1, arg2'=1+arg2, [ arg1<arg4 ], cost: 4

   Accelerated rule 24 with backward acceleration, yielding the new rule 26.
[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
      8: f5 -> f9 : [ arg1>=arg3 ], cost: 1
     25: f5 -> f5 : arg1'=arg3, arg2'=arg2+arg3-arg1, [ arg3-arg1>=0 ], cost: 4*arg3-4*arg1
     26: f9 -> f9 : arg1'=arg4, arg2'=arg2+arg4-arg1, [ arg4-arg1>=0 ], cost: 4*arg4-4*arg1
     18: __init -> f5 : arg1'=arg1P_1, arg2'=arg2P_2, arg3'=arg3P_3, arg4'=arg4P_4, [], cost: 5

Chained accelerated rules (with incoming rules):
   Start location: __init
      8: f5 -> f9 : [ arg1>=arg3 ], cost: 1
     28: f5 -> f9 : arg1'=arg4, arg2'=arg2+arg4-arg1, [ arg1>=arg3 && arg4-arg1>=0 ], cost: 1+4*arg4-4*arg1
     18: __init -> f5 : arg1'=arg1P_1, arg2'=arg2P_2, arg3'=arg3P_3, arg4'=arg4P_4, [], cost: 5
     27: __init -> f5 : arg1'=arg3P_3, arg2'=arg2P_2-arg1P_1+arg3P_3, arg3'=arg3P_3, arg4'=arg4P_4, [ -arg1P_1+arg3P_3>=0 ], cost: 5-4*arg1P_1+4*arg3P_3

Removed unreachable locations (and leaf rules with constant cost):
   Start location: __init
     28: f5 -> f9 : arg1'=arg4, arg2'=arg2+arg4-arg1, [ arg1>=arg3 && arg4-arg1>=0 ], cost: 1+4*arg4-4*arg1
     18: __init -> f5 : arg1'=arg1P_1, arg2'=arg2P_2, arg3'=arg3P_3, arg4'=arg4P_4, [], cost: 5
     27: __init -> f5 : arg1'=arg3P_3, arg2'=arg2P_2-arg1P_1+arg3P_3, arg3'=arg3P_3, arg4'=arg4P_4, [ -arg1P_1+arg3P_3>=0 ], cost: 5-4*arg1P_1+4*arg3P_3

Eliminated locations (on tree-shaped paths):
   Start location: __init
     29: __init -> f9 : arg1'=arg4P_4, arg2'=arg4P_4+arg2P_2-arg1P_1, arg3'=arg3P_3, arg4'=arg4P_4, [ arg1P_1>=arg3P_3 && arg4P_4-arg1P_1>=0 ], cost: 6+4*arg4P_4-4*arg1P_1
     30: __init -> f9 : arg1'=arg4P_4, arg2'=arg4P_4+arg2P_2-arg1P_1, arg3'=arg3P_3, arg4'=arg4P_4, [ -arg1P_1+arg3P_3>=0 && arg4P_4-arg3P_3>=0 ], cost: 6+4*arg4P_4-4*arg1P_1

### Computing asymptotic complexity ###

Fully simplified ITS problem
   Start location: __init
     29: __init -> f9 : arg1'=arg4P_4, arg2'=arg4P_4+arg2P_2-arg1P_1, arg3'=arg3P_3, arg4'=arg4P_4, [ arg1P_1>=arg3P_3 && arg4P_4-arg1P_1>=0 ], cost: 6+4*arg4P_4-4*arg1P_1
     30: __init -> f9 : arg1'=arg4P_4, arg2'=arg4P_4+arg2P_2-arg1P_1, arg3'=arg3P_3, arg4'=arg4P_4, [ -arg1P_1+arg3P_3>=0 && arg4P_4-arg3P_3>=0 ], cost: 6+4*arg4P_4-4*arg1P_1

Computing asymptotic complexity for rule 29
   Resulting cost 0 has complexity: Unknown

Computing asymptotic complexity for rule 30
   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),?)