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View Compilation Error

0_0_38500640_28960.cpp: In function 'int SG(int)':
0_0_38500640_28960.cpp:50:10: error: 'class std::map<int, int>' has no member named 'contains'
  if (_SG.contains(x))
          ^
0_0_38500640_28960.cpp:62:11: error: 'class std::set<int>' has no member named 'contains'
   if (!st.contains(i))
           ^


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