oj.uz

답안 #1063480

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1063480 2024-08-17T19:15:37 Z avighna Roadside Advertisements (NOI17_roadsideadverts) C++17
100 / 100
 152 ms 27392 KB 
#include <bits/stdc++.h>

typedef long long ll;

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(nullptr);

  ll n;
  std::cin >> n;
  std::vector<std::vector<std::pair<ll, ll>>> adj(n);
  for (ll i = 0, u, v, w; i < n - 1; ++i) {
    std::cin >> u >> v >> w;
    adj[u].push_back({v, w});
    adj[v].push_back({u, w});
  }

  std::vector<std::vector<ll>> lift(n, std::vector<ll>(16));
  std::vector<std::vector<ll>> lift_sum(n, std::vector<ll>(16));
  std::vector<ll> depth(n);
  std::function<void(ll, ll)> dfs;
  dfs = [&](ll node, ll par) {
    for (auto &[i, w] : adj[node]) {
      if (i == par) {
        continue;
      }
      lift[i][0] = node;
      lift_sum[i][0] = w;
      depth[i] = depth[node] + 1;
      dfs(i, node);
    }
  };
  dfs(0, -1);

  for (ll bt = 1; bt < 16; ++bt) {
    for (ll i = 0; i < n; ++i) {
      lift[i][bt] = lift[lift[i][bt - 1]][bt - 1];
      lift_sum[i][bt] = lift_sum[i][bt - 1] + lift_sum[lift[i][bt - 1]][bt - 1];
    }
  }

  auto lca = [&](ll u, ll v) {
    if (depth[u] > depth[v]) {
      std::swap(u, v);
    }
    ll k = depth[v] - depth[u];
    for (ll bt = 0; bt < 16; ++bt) {
      if (k & (1 << bt)) {
        v = lift[v][bt];
      }
    }
    if (u == v) {
      return u;
    }
    for (ll bt = 15; bt >= 0; --bt) {
      if (lift[u][bt] != lift[v][bt]) {
        u = lift[u][bt];
        v = lift[v][bt];
      }
    }
    return lift[u][0];
  };

  auto lca_mult = [&](const std::vector<ll> &nodes) {
    ll ans = nodes[0];
    for (ll i = 1; i < nodes.size(); ++i) {
      ans = lca(ans, nodes[i]);
    }
    return ans;
  };

  auto sum = [&](ll from, ll to) {
    ll k = depth[from] - depth[to];
    ll ans = 0;
    for (ll bt = 0; bt < 16; ++bt) {
      if (k & (1 << bt)) {
        ans += lift_sum[from][bt];
        from = lift[from][bt];
      }
    }
    return ans;
  };

  ll q;
  std::cin >> q;
  while (q--) {
    std::vector<ll> arr = {0, 0, 0, 0, 0};
    std::cin >> arr[0] >> arr[1] >> arr[2] >> arr[3] >> arr[4];
    ll ans = 0;
    ll LCA = lca_mult(arr);
    for (ll mask = 1; mask < 32; ++mask) {
      std::vector<ll> nodes;
      for (ll i = 0; i < 5; ++i) {
        if (mask & (1 << i)) {
          nodes.push_back(arr[i]);
        }
      }
      ll cur = sum(lca_mult(nodes), LCA);
      if (__builtin_popcount(mask) % 2 == 1) {
        ans += cur;
      } else {
        ans -= cur;
      }
    }
    std::cout << ans << '\n';
  }
}

Compilation message

roadsideadverts.cpp: In lambda function:
roadsideadverts.cpp:66:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for (ll i = 1; i < nodes.size(); ++i) {
      |                    ~~^~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 152 ms 24396 KB Output is correct
2 Correct 139 ms 27296 KB Output is correct
3 Correct 148 ms 27220 KB Output is correct
4 Correct 130 ms 27284 KB Output is correct
5 Correct 129 ms 27392 KB Output is correct
6 Correct 134 ms 27220 KB Output is correct
7 Correct 136 ms 27220 KB Output is correct
8 Correct 131 ms 27328 KB Output is correct
9 Correct 131 ms 27216 KB Output is correct
10 Correct 137 ms 27220 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 35 ms 21288 KB Output is correct
2 Correct 42 ms 25948 KB Output is correct
3 Correct 43 ms 25956 KB Output is correct
4 Correct 45 ms 26052 KB Output is correct
5 Correct 43 ms 25940 KB Output is correct
6 Correct 41 ms 25948 KB Output is correct
7 Correct 43 ms 25864 KB Output is correct
8 Correct 41 ms 25936 KB Output is correct
9 Correct 40 ms 26072 KB Output is correct
10 Correct 41 ms 26068 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 152 ms 24396 KB Output is correct
3 Correct 139 ms 27296 KB Output is correct
4 Correct 148 ms 27220 KB Output is correct
5 Correct 130 ms 27284 KB Output is correct
6 Correct 129 ms 27392 KB Output is correct
7 Correct 134 ms 27220 KB Output is correct
8 Correct 136 ms 27220 KB Output is correct
9 Correct 131 ms 27328 KB Output is correct
10 Correct 131 ms 27216 KB Output is correct
11 Correct 137 ms 27220 KB Output is correct
12 Correct 35 ms 21288 KB Output is correct
13 Correct 42 ms 25948 KB Output is correct
14 Correct 43 ms 25956 KB Output is correct
15 Correct 45 ms 26052 KB Output is correct
16 Correct 43 ms 25940 KB Output is correct
17 Correct 41 ms 25948 KB Output is correct
18 Correct 43 ms 25864 KB Output is correct
19 Correct 41 ms 25936 KB Output is correct
20 Correct 40 ms 26072 KB Output is correct
21 Correct 41 ms 26068 KB Output is correct
22 Correct 151 ms 24400 KB Output is correct
23 Correct 93 ms 21848 KB Output is correct
24 Correct 137 ms 26196 KB Output is correct
25 Correct 133 ms 26192 KB Output is correct
26 Correct 135 ms 26196 KB Output is correct
27 Correct 130 ms 26204 KB Output is correct
28 Correct 142 ms 26200 KB Output is correct
29 Correct 131 ms 26232 KB Output is correct
30 Correct 147 ms 26204 KB Output is correct
31 Correct 132 ms 26232 KB Output is correct