Compilare: user.cpp: In function ‘int df(int)’: user.cpp:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:82:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=0;l<G[a[i][j]].size();l++) ^ user.cpp:102:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(G[i].size()<k) ^ user.cpp:112:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp:114:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[G[nod][i]].size();j++) ^ user.cpp:122:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(G[G[nod][i]].size()<k) ^