Eroare de compilare: user.cpp: In function ‘void process(std::string, cell)’: user.cpp:64: error: no match for ‘operator=’ in ‘references[((int)pos.cell::row)][((int)pos.cell::column)] = 0’ /usr/include/c++/4.4/bits/stl_stack.h:93: note: candidates are: std::stack<cell, std::deque<cell, std::allocator<cell> > >& std::stack<cell, std::deque<cell, std::allocator<cell> > >::operator=(const std::stack<cell, std::deque<cell, std::allocator<cell> > >&) user.cpp:77: warning: comparison between signed and unsigned integer expressions user.cpp:101: error: ‘value’ was not declared in this scope