Compilare: user.cpp: In function ‘std::vector<int> intersect(std::vector<int>, std::vector<int>)’: user.cpp:16:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<a.size() && j<b.size();) ~^~~~~~~~~ user.cpp:16:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<a.size() && j<b.size();) ~^~~~~~~~~ user.cpp: In function ‘std::vector<int> reunion(std::vector<int>, std::vector<int>)’: user.cpp:30:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<a.size() && j<b.size();) ~^~~~~~~~~ user.cpp:30:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<a.size() && j<b.size();) ~^~~~~~~~~ user.cpp:38:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a.size()) ~^~~~~~~~~ user.cpp:40:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<b.size()) ~^~~~~~~~~ user.cpp: In function ‘std::vector<int> termen()’: user.cpp:80:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[posi].size();++j) ~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:111:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<R.size();++i) ~^~~~~~~~~