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简答题设有文法G[W]:W→A0A→A0|W1|0,改写文法消除左递归
  • 非终结符排序为W,A
    则W→A0A→A0|A01|0
    改写后消除左递归为W→A0A→0A’A’→0A’|01A’|ε
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