Compilare: user.cpp: In function ‘void mult(std::vector<int>&, std::vector<int>&, std::vector<int>&)’: user.cpp:55:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (n<max(p.size(),q.size())) n*=2; ^ user.cpp: In function ‘int main()’: user.cpp:114:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<r.size(); ++i) ^ user.cpp:82:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:87:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:98:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^ user.cpp:103:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:108:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^