Stage 2 summary at 50 accepted trajectories

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tasks_gen/train/G1053/spec.md

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+# 1. Goal
+A data centre operator bills its customers for the server racks that they rent.
+A billing program calls one class for each billing run. The class returns one
+row per customer with the number of racks and the monthly fee.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- There are no seed objects. Create the class in package $TMP.
+- A rack has a rack ID, a customer, a size class and a power class.
+- The billing input can contain the same rack more than once.
+- The class is the only object of this task.
+
+# 4. Contract
+Create the class {{P}}RACK_BILLING in package $TMP.
+- The class is public and final. It has a public constructor without parameters.
+- Public types:
+  TYPES ty_size TYPE c LENGTH 1.
+  TYPES ty_power TYPE c LENGTH 1.
+  TYPES ty_customer TYPE c LENGTH 10.
+  TYPES ty_fee TYPE p LENGTH 8 DECIMALS 2.
+  TYPES: BEGIN OF ty_rack,
+            rack_id     TYPE c LENGTH 10,
+            customer    TYPE ty_customer,
+            size_class  TYPE ty_size,
+            power_class TYPE ty_power,
+          END OF ty_rack.
+  TYPES tt_racks TYPE STANDARD TABLE OF ty_rack WITH EMPTY KEY.
+  TYPES: BEGIN OF ty_bill,
+            customer   TYPE ty_customer,
+            rack_count TYPE i,
+            total_fee  TYPE ty_fee,
+          END OF ty_bill.
+  TYPES tt_bills TYPE STANDARD TABLE OF ty_bill WITH EMPTY KEY.
+- Public method:
+  METHODS calculate
+    IMPORTING it_racks        TYPE tt_racks
+    RETURNING VALUE(rt_bills) TYPE tt_bills.
+- Do not add other public methods.
+
+# 5. Business rules
+A rack is valid when its size class is S, M or L and its power class is A, B
+or C.
+1. Read it_racks in the given order.
+2. A rack ID identifies one rack. If a rack ID was already read, skip the rack.
+   Remember the rack ID of every rack that you read, also when the rack is not
+   valid.
+3. If the size class is not S, M or L, or the power class is not A, B or C,
+   skip the rack.
+4. The monthly fee of a valid rack is the base fee of its size class plus the
+   surcharge of its power class:
+   - base fee: S = 50.00, M = 120.00, L = 250.00
+   - power surcharge: A = 0.00, B = 30.00, C = 70.00
+5. Add the fee of the rack to the total fee of its customer. Increase the rack
+   count of the customer by 1.
+6. After all racks, apply a volume discount to the total fee of each customer:
+   - 20 or more racks: 20 percent
+   - 10 or more racks: 10 percent
+   - less than 10 racks: no discount
+7. The result has one row for each customer with at least one valid rack. The
+   row contains the customer, the number of valid racks and the total fee after
+   the discount.
+8. Sort the result by customer in ascending order.
+9. If it_racks is empty, return an empty table.
+
+# 6. Constraints
+- Release target: 8.16.
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code.
+- Out of scope: no other object.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.