Compilare: user.cpp: In function 'void print(std::vector<int, std::allocator<int> >)': user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'std::vector<int, std::allocator<int> > eval(char*, int, int)': user.cpp:73: warning: comparison between signed and unsigned integer expressions user.cpp:81: warning: comparison between signed and unsigned integer expressions user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp:96: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:119: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'std::vector<int, std::allocator<int> > eval(char*, int, int)': user.cpp:40: warning: 'Middle' may be used uninitialized in this function /tmp/cctfZOAM.o: In function `main': user.cpp:(.text+0xacf): warning: the `gets' function is dangerous and should not be used.