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View Compilation Error

0_0_32586688_30973.cpp: In function 'std::string solve(const string&, int, int)':
0_0_32586688_30973.cpp:22:58: error: 'in' was not declared in this scope
     int index=matching(s,sta,des);  return solve(s,sta+1,in
                                                          ^


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