#include #include using namespace std; int main() { int n; cin >> n; vector w(n); w[0] = 0; for (int i=1;i<=n;i++) cin >> w[i]; int t = 0; int th =0; for (int a : w ) t += a; if (t%2!=0) { cout << "impossible" << endl; return 0; } th = t/2; vector> m(n+1, vector(th+1, 0)); int i, j; for (i=1;i