Compilare: user.cpp: In function ‘void insert(long long int)’: user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int verif(long int)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int dif(long int)’: user.cpp:44: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:70: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:71: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:73: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result