Compilare: user.cpp: In function ‘void insert(long long int)’: user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void erase(long long int)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int count(long long int)’: user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int count(long long int)’: user.cpp:43: warning: control reaches end of non-void function