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View Compilation Error

0_0_6584600_2546.cpp: In function `int main()':
0_0_6584600_2546.cpp:54: error: invalid initialization of reference of type 'const line&' from expression of type '__gnu_cxx::__normal_iterator<line*, std::vector<line, std::allocator<line> > >'
0_0_6584600_2546.cpp:22: error: in passing argument 1 of `bool sort(const line&, const line&)'


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