Here is a C++ solution,
bool areSame(string doc1, string doc2){ if(doc1.length() != doc2.length()) return false; for(int i=0; i<doc1.length(); i++) if(doc1[i] != doc2[i] && (doc1[i] != 'X' || (doc1[i] == 'X' && doc2[i] == '\n'))) return false; return true; }
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Here is a C++ solution,