#include #include using namespace std; vector eratos(int a){ vector ve; int arr[a]; for(int i=0; i>n; vector va; va=eratos(n); int arr[n+1]; for(int i=0; i=2; --j){ if(arr[j]!=-1){ if(va[i]+j<=n && arr[va[i]+j]!=0 && arr[va[i]+j]