Compilare: user.cpp: In function ‘int main()’: user.cpp:9:9: warning: unused variable ‘element’ [-Wunused-variable] int element; ^ user.cpp:10:10: warning: unused variable ‘alreadyCreated’ [-Wunused-variable] bool alreadyCreated = false; ^ user.cpp:11:9: warning: unused variable ‘andValue’ [-Wunused-variable] int andValue; ^ user.cpp:12:9: warning: unused variable ‘current’ [-Wunused-variable] int current = 0; ^ user.cpp:16:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input,"%d",&length); ^ user.cpp:20:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input,"%d ",&numbers[i]); ^