Compilare: user.cpp: In function 'int main()': user.cpp:24: warning: format '%d' expects type 'int', but argument 2 has type 'long long int' user.cpp:25: warning: format '%d' expects type 'int', but argument 2 has type 'long long int' user.cpp: In function 'int cat(int)': user.cpp:7: warning: 'k' may be used uninitialized in this function