Compilare: user.cpp: In function ‘void merge(std::vector<short int>&, std::vector<short int>&)’: user.cpp:20:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) a.push_back(b[i]); ^ user.cpp:25:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a.size() && j<b.size()) ^ user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a.size() && j<b.size()) ^ user.cpp:30:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a.size()) c.push_back(a[i]),i++; ^ user.cpp:31:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<b.size()) c.push_back(b[j]),j++; ^ user.cpp:34:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<c.size();i++) ^ user.cpp: In function ‘void citeste(int&)’: user.cpp:54:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp:64:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:70:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flori.in","r",stdin); ^ user.cpp:71:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flori.out","w",stdout); ^ user.cpp:72:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^