Compilare: user.cpp: In function ‘void D(int, int)’: user.cpp:5:77: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int x,y,A,C[N],i,j,n,m;vector<int>a[N];void D(int k,int t){int P,i;for(i=0;i<a[k].size();++i){P=a[k][i];if(P!=t)D(P,k),C[k]+=C[P];}if(C[k]&1)++A;}int main(){ifstream f("arbore5.in");f>>n>>m;for(i=1;i<n;++i){f>>x>>y;a[x].push_back(y);a[y].push_back(x);}for(i=0;i<m;++i){f>>x>>y;++C[x];++C[y];}D(1,0);ofstream g("arbore5.out");g<<n-A-1;} ^