Compilare: user.cpp: In member function ‘void DSum::operator-=(const DSum&)’: user.cpp:20:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int sum = 0; sum < sum_count.size(); ++sum) { ^ user.cpp: In member function ‘void DSum::Add(DSum)’: user.cpp:35:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int sum = 0; sum < sum_count.size(); ++sum) { ^ user.cpp: In function ‘int main()’: user.cpp:109:12: warning: unused variable ‘time_start’ [-Wunused-variable] double time_start = clock(); ^ user.cpp:110:18: warning: unused variable ‘B’ [-Wunused-variable] long long A, B; ^ user.cpp:117:5: warning: ‘A’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (A > 1) { ^