Remove buggy c++

retrieval_code_code/train/C++_code_code_train_file_000.jsonl

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retrieval_code_code/train/C++_code_code_train_file_001.jsonl

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retrieval_code_code/train/C++_code_code_train_file_002.jsonl

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retrieval_code_code/train/C++_code_code_train_file_003.jsonl

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retrieval_code_code/train/C++_code_code_train_file_004.jsonl

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retrieval_code_code/train/C++_code_code_train_file_005.jsonl

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retrieval_code_code/train/C++_code_code_train_file_006.jsonl

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