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0_0_6840292_10917.cpp: In function `void init()':
0_0_6840292_10917.cpp:41: error: no matching function for call to `sort(__gnu_cxx::__normal_iterator<int**, std::vector<int*, std::allocator<int*> > >, __gnu_cxx::__normal_iterator<int**, std::vector<int*, std::allocator<int*> > >, init()::cmp)'