Compilare: user.cpp: In function ‘void add(std::vector<int>&, std::vector<int>&)’: user.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < A.size(); i++) ^ user.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < B.size()) ^ user.cpp: In function ‘int main()’: user.cpp:56:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culori3.in", "r", stdin); ^ user.cpp:57:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culori3.out", "w", stdout); ^ user.cpp:72:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^