Compilare: user.cpp: In function ‘void Solve()’: user.cpp:26:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Path.size();i++) { ^ user.cpp: In function ‘void Read()’: user.cpp:51:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,Nr,Min; ^ user.cpp:52:10: warning: unused variable ‘C’ [-Wunused-variable] char C; ^ user.cpp: In function ‘void Write()’: user.cpp:99:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Path.size() == N*M - B) { ^ user.cpp:103:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Path.size();i++) ^