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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long LL;
  4.  
  5. LL cost[10010];
  6. int TL[10010];
  7. vector<vector<int>> edges;
  8. LL ans;
  9.  
  10. LL DFS(const int u, const int p, const LL now) {
  11. LL mx = 0;
  12. bool flag = 0;
  13. for (auto& e : edges[u]) {
  14. if (e != p) {
  15. flag = 1;
  16. mx = max(mx, DFS(e, u, now + TL[u]));
  17. }
  18. }
  19. if (!flag)
  20. cost[u] = now + TL[u];
  21. else
  22. cost[u] = mx;
  23. return cost[u];
  24. }
  25.  
  26. void solve(const int u, const int p, const LL bought) {
  27. if (cost[u] <= bought)
  28. return;
  29. LL tot = min((LL)TL[u], cost[u] - bought);
  30. ans += tot;
  31. for (auto& e : edges[u])
  32. if (e != p)
  33. solve(e, u, bought + tot);
  34. }
  35.  
  36. int main() {
  37. int T, N, X, u, v;
  38. LL K;
  39. scanf("%d", &T);
  40. while (T--) {
  41. scanf("%d %d %lld", &N, &X, &K);
  42. for (int i = 1; i <= N; i++)
  43. scanf("%d", &TL[i]);
  44. edges.assign(N + 5, vector<int>());
  45. for (int i = 0; i < N - 1; i++)
  46. scanf("%d %d", &u, &v), edges[u].push_back(v), edges[v].push_back(u);
  47. DFS(X, X, 0);
  48. ans = 0;
  49. solve(X, X, K);
  50. printf("%lld\n", 2 * ans);
  51. }
  52. return 0;
  53. }
  54.  
Runtime error #stdin #stdout 0s 15352KB
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