Compilare: user.cpp: In function ‘void solve()’: user.cpp:56:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(pos < temp.size())/// get the row value, it can be A1 or A12 ^ user.cpp:80:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(pos < temp.size())/// get the row value, it can be A1 or A12 ^