Compilare: user.cpp: In function ‘bool intersectie(std::vector<int>, std::vector<int>)’: user.cpp:12:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.size(); i++) ^ user.cpp:13:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<y.size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0; l<f.size(); l++) ^ user.cpp:38:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<f.size(); j++){ ^ user.cpp:39:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0; l<gr[d].size(); l++){ ^ user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<f.size(); j++) ^ user.cpp:67:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<p[i].size(); j++) ^