Compilare: user.cpp: In function ‘std::vector<int> aduna(std::vector<int>, std::vector<int>)’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size() || i < b.size() || t != 0; i++) ^ user.cpp:19:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size() || i < b.size() || t != 0; i++) ^ user.cpp:21:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i >= a.size() ) ^ user.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i >= b.size() ) ^ user.cpp: In function ‘int main()’: user.cpp:40:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aladdin2.in","r",stdin); ^ user.cpp:41:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aladdin2.out","w",stdout); ^ user.cpp:43:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &M, &N); ^