Eroare de compilare: user.cpp:195: warning: ISO C++ forbids declaration of ‘main’ with no type user.cpp: In function ‘int main()’: user.cpp:197: warning: deprecated conversion from string constant to ‘char*’ user.cpp:197: warning: deprecated conversion from string constant to ‘char*’ /tmp/cc6EVxbY.o:(.rodata._ZTI4hash[typeinfo for hash]+0x8): undefined reference to `typeinfo for prototip' collect2: ld returned 1 exit status