Submission #798461

#	Time	Username	Problem	Language	Result	Execution time	Memory
798461		HunterXD	Roadside Advertisements (NOI17_roadsideadverts)	C++17	47 / 100	1056 ms	6996 KiB

roadsideadverts

#include <bits/stdc++.h>
using namespace std;

typedef unsigned short us;
typedef vector<int> vl;
typedef vector<vl> vvl;

#define all(x) x.begin(), x.end()
#define pb push_back

const char nd = '\n';

struct edge {
  us v;
  int w;
};

vector<vector<edge>> graph;
bitset<50001> visto;

int res = 0;
us dfs(us u, us p) {
  us cdown = 0, temp = 0;
  for (auto v : graph[u]) {
    if (v.v == p) continue;
    temp = dfs(v.v, u);
    if (temp && temp != 5) res += v.w;
    cdown += temp;
  }
  if (visto[u]) cdown++;
  return cdown;
}

signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  //
  int n;
  cin >> n;

  graph.assign(n + 1, vector<edge>());

  us u, v;
  int w;
  for (int i = 1; i < n; i++) {
    cin >> u >> v >> w;
    graph[u].pb({v, w});
    graph[v].pb({u, w});
  }

  int q;
  cin >> q;

  vector<us> a(5);

  while (q--) {
    for (auto &v : a) cin >> v, visto[v] = true;
    res = 0;
    dfs(0, -1);
    for (auto &v : a) visto[v] = false;
    cout << res << nd;
  }
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 23
• Subtask 3: 40 / 40
• Subtask 4: 0 / 30