Compilare: user.cpp: In function ‘void read_data()’: user.cpp:10: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:19: warning: unused variable ‘max_pos’ user.cpp: In function ‘int main()’: user.cpp:45: warning: ‘max_pos’ may be used uninitialized in this function