Compilare: main.cpp: In function 'void dfs(int)': main.cpp:2:177: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] using namespace std;long d[50001],n,m,i,sol[50002],k,x,y;vector <int>v[50001];ifstream in ("sortaret.in");ofstream out ("sortaret.out");void dfs(int nod){d[nod]=1;for(int i=0;i<v[nod].size();i++){if(!d[v[nod][i]]){dfs(v[nod][i]);}} sol[++k]=nod;}int main(){in>>n>>m;for(i=1;i<=m;i++){in>>x>>y;v[x].push_back(y);}for(i=1;i<=n;i++){if(d[i]==0)dfs(i);}for(i=k;i>=1;i--)out<<sol[i]<<" ";return 0;} ~^~~~~~~~~~~~~~