Compilare: user.cpp: In function ‘void back(int)’: user.cpp:14: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int main()’: user.cpp:25: 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 3 has type ‘short int*’ user.cpp:27: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘short int*’ user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result