Compilare: user.cpp: In function ‘void f()’: user.cpp:75:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < rez.size(); i++) { ^ user.cpp: In function ‘void FFT(std::vector<Point>&, int, int)’: user.cpp:87:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < init.size(); i++) ^ user.cpp:106:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < init.size(); i++) ^ user.cpp: In function ‘std::vector<int> calc(std::vector<int>&, std::vector<int>&)’: user.cpp:118:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((1 << n) < a.size() + b.size()) ^ user.cpp:122:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < a.size(); i++) ^ user.cpp:124:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < b.size(); i++) ^