Compilare: user.cpp: In function ‘std::vector<int> multiply(const std::vector<int>&, const std::vector<int>&)’: user.cpp:76:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < va.size(); ++i) nc.push_back(va[i] * vb[i]); ~~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:106:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < c.size(); ++i) ~~^~~~~~~~~~ user.cpp:88:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bacterii2.in", "r", stdin); ^ user.cpp:89:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bacterii2.out", "w", stdout); ^