Eroare de compilare: user.cpp:3:19: error: <cstdlib: No such file or directory user.cpp: In constructor ‘universal_hash<T>::universal_hash()’: user.cpp:214: error: there are no arguments to ‘rand’ that depend on a template parameter, so a declaration of ‘rand’ must be available user.cpp:214: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated) user.cpp:215: error: there are no arguments to ‘rand’ that depend on a template parameter, so a declaration of ‘rand’ must be available user.cpp: In function ‘int main()’: user.cpp:247: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:248: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:251: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:254: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result