Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:29:27: error: ‘sort’ was not declared in this scope sort(a.begin(),a.end()); ^ user.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++){ ^ user.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<(a.size()-1) && a[i]==a[i+1]) ^ user.cpp:37:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G[i].size();j++) { ^