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编译失败
/tmp/compiler_th6sdy2q/src: 在函数‘int main(int, char**)’中:/tmp/compiler_th6sdy2q/src:5:31: 错误：conversion from ‘void’ to non-scalar type ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} requested
    5 |     std::string a=ouf.readEoln();
      |                   ~~~~~~~~~~~~^~