Compilare: user.cpp: In function 'int invert(int (*)[505], std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)': user.cpp:11: warning: comparison between signed and unsigned integer expressions user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int printsol(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)': user.cpp:26: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void printv(std::vector<int, std::allocator<int> >)': user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int solve(int (*)[505], std::vector<int, std::allocator<int> >&, std::vector<int, std::allocator<int> >&)': user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:52: warning: comparison between signed and unsigned integer expressions