Compilare: user.cpp: In function ‘void Add(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >&)’: user.cpp:8: warning: comparison between signed and unsigned integer expressions user.cpp:8: warning: comparison between signed and unsigned integer expressions user.cpp:9: warning: comparison between signed and unsigned integer expressions user.cpp:10: warning: comparison between signed and unsigned integer expressions user.cpp:12: warning: comparison between signed and unsigned integer expressions user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘void Mul(std::vector<int, std::allocator<int> >, int, std::vector<int, std::allocator<int> >&)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result