feat: add benchmark-programs — 58 telecom COBOL test programs

作为子目录纳入系统，与核心测试管道协同 Co-Authored-By: Claude <noreply@anthropic.com>
2026-06-25 09:53:21 +08:00
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+# 18-matching-MN-to-M: M:N Matching with M Output Records
+
+## 电信业务场景
+
+合同↔套餐M:N→M条。多个合同关联多个套餐的组合匹配，输出按合同件数(M件)的匹配结果。
+
+## Description
+
+M:N matching where both sides can have duplicate keys. The output contains
+one record per master record that has at least one matching detail record
+with the same key. This tests the ability to handle M:N relationships
+and produce one output per matched master.
+
+The algorithm skips master groups with no matching detail key, and skips
+detail key groups that have no corresponding master key.
+
+## Record Layout
+
+Standard record (45 bytes, copybook STD-REC.cpy):
+| Field      | Type              | Length | Description        |
+|------------|-------------------|--------|--------------------|
+| STD-KEY    | PIC X             | 10     | Record key         |
+| STD-DATA-1 | PIC X             | 20     | Text data          |
+| STD-DATA-2 | PIC 9             | 10     | Numeric data       |
+| STD-DATA-3 | PIC S9(7)V99 COMP-3| 5    | Packed decimal     |
+
+## Files
+
+| File                            | Purpose                              |
+|---------------------------------|--------------------------------------|
+| main-18-matching-MN-to-M.cbl    | Main COBOL program (fixed format)    |
+| data-gen.sh                     | Generate test data for all files     |
+| run.sh                          | Compile, run, verify                 |
+| README.md                       | This file                            |
+
+## Data Design
+
+- master.dat: 5 records -- KEY00001 (2), KEY00002 (2), KEY00003 (1)
+- detail.dat: 4 records -- KEY00001 (2), KEY00003 (2)
+- Matching keys: KEY00001, KEY00003
+- Unmatched: KEY00002 (master only)
+- Output: 3 records = 135 bytes
+
+## Expected Behavior
+
+- KEY00001 group (2 master records): matches detail KEY00001 -> output 2 records
+- KEY00002 group (2 master records): no matching detail -> output 0 records
+- KEY00003 group (1 master record): matches detail KEY00003 -> output 1 record
+- Total: 3 output records