Compilare: user.cpp: In function ‘int main()’: user.cpp:2:315: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] using namespace std;ifstream f("costuri.in");ofstream g("costuri.out");unordered_map<int,vector<int>>mp;int prod(int x){int ans=1;if(x==0)return 0;while(x){ans*=(x%10);x=x/10;}return ans;}int n,x,i,y,m;int main(){f>>n;for(i=1;i<=n;i++){f>>x;mp[prod(x)].push_back(x);}f>>m;for(i=1;i<=m;i++){f>>x>>y;if(mp[y].size()<x) g<<-1<<"\n";else g<<mp[y][x-1]<<"\n";}return 0;} ^