NB-076
40 lines
1.4 KiB
Markdown
40 lines
1.4 KiB
Markdown
# 19-matching-MN-to-N
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## 电信业务场景
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套餐适用M:N→N条。多个合同关联多个套餐的组合匹配，输出按套餐件数(N件)的适用明细。
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**M:N matching — output N records (one per detail match).**
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Tests the scenario where both input files may contain duplicate keys.
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The program performs a grouped match: for each key where at least one
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master record exists, the program outputs every detail record for that
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key, then skips all master records for that key.
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## Test data
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| File | Records | Keys |
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|-------------|---------|-------------------------------|
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| master.dat | 4 | KEY00001 (x2), KEY00002 (x2) |
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| detail.dat | 5 | KEY00001 (x2), KEY00003 (x3) |
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- **Matched key:** KEY00001 -> 2 output records (2 detail records)
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- **Unmatched master key:** KEY00002 (skipped)
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- **Unmatched detail key:** KEY00003 (skipped)
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## Algorithm
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1. Read both files synchronously (both assumed sorted by key).
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2. When keys match: output all detail records in the group, then skip all
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master records in the group.
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3. When master key < detail key: skip all master records with that key
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(no matching detail).
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4. When detail key < master key: skip all detail records with that key
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(no matching master).
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## Expected output
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- **output.dat:** 2 records x 45 bytes = 90 bytes
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- Program displays: `19-matching-MN-to-N: PASS`
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- Script displays: `19-matching-MN-to-N: ALL TESTS PASSED`
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