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답안 #366950

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
366950 2021-02-15T19:42:08 Z alrad Janjetina (COCI21_janjetina) C++17
15 / 110
 1500 ms 4372 KB 
#include <bits/stdc++.h>

using namespace std;

using ld = long double;
using ull = unsigned long long;

/*
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("-O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
*/

template <class T> inline T gcd(T a , T b) { return !a ? b : gcd(b % a , a); }
template <class T> inline T lcm(T a , T b) {return (a * b) / gcd(a , b) ; }

mt19937 rnd(time(0));

#define all(x) x.begin(), x.end()
#define debug(x) { cerr << #x << " = " << x << endl; }

const int N = 1e5 + 2;

int n, k, sub[N], depth[N];
long long fen[N], ans = 0ll;
vector<bool> used(N, false);

vector<pair<int, int>> cnt;
vector<vector<pair<int, int>>> g(N, vector<pair<int, int>>());

void calc(int v, int par = -1) {
  sub[v] = 1;
  if (par != -1) {
    depth[v] = depth[par] + 1;
  } else {
    depth[v] = 0;
  }
  for (auto edge : g[v]) {
    int to = edge.first;
    if (to != par && !used[to]) {
      calc(to, v);
      sub[v] += sub[to];
    }
  }
  return;
}

int getCentroid(int v, int par, int subSize) {
  for (auto edge : g[v]) {
    int to = edge.first;
    if (sub[to] > (subSize / 2) && !used[to] && to != par) {
      return getCentroid(to, v, subSize);
    }
  }
  return v;
}

void dfs1(int v, int par, int maxEdge) {
  cnt.push_back({v, maxEdge});
  for (auto edge : g[v]) {
    int to = edge.first, wei = edge.second;
    if (!used[to] && to != par) {
      dfs1(to, v, max(maxEdge, wei));
    }
  }
  return;
}

bool comp(const pair<int, int> &p1, const pair<int, int> &p2) {
  if (p1.second != p2.second) {
    return p1.second < p2.second;
  }
  return p1.first < p2.first;
}

long long query(int R) {
  long long sum = 0ll;
  R++;
  for (; R >= 0; R = (R & (R + 1)) - 1) {
    sum += fen[R];
  }
  return sum;
}

void upd(int i, long long value) {
  i++;
  for (; i < N - 1; i = (i | (i + 1))) {
    fen[i] += value;
  }
  return;
}

void decompose(int v) {
  calc(v);
  used[v] = true;
  dfs1(v, -1, 0);
  sort(all(cnt), comp);
  for (auto temp : cnt) {
    int ver = temp.first, wei = temp.second;
    ans += query(wei - k - depth[ver]);
    upd(depth[ver], +1);
  }
  for (auto temp : cnt) {
    int ver = temp.first;
    upd(depth[ver], -1);
  }
  cnt.clear();
  for (auto edge : g[v]) {
    int to = edge.first;
    if (!used[to]) {
      dfs1(to, v, edge.second);
      sort(all(cnt), comp);
      for (auto temp : cnt) {
        int ver = temp.first, wei = temp.second;
        ans -= query(wei - k - depth[ver]);
        upd(depth[ver], +1);
      }
      for (auto temp : cnt) {
        int ver = temp.first;
        upd(depth[ver], -1);
      }
      cnt.clear();
    }
  }
  for (auto edge : g[v]) {
    int to = edge.first;
    if (!used[to]) {
      decompose(to);
    }
  }
  return;
}

void solve() {
  cin >> n >> k;
  for (int i = 1; i < n; i++) {
    int u, v, wei;
    cin >> u >> v >> wei;
    g[u].push_back({v, wei});
    g[v].push_back({u, wei});
  }
  decompose(getCentroid(1, -1, n));
  cout << 2ll * ans << '\n';
  return;
}

signed main() {
  ios_base :: sync_with_stdio(0);
  cin.tie(0) , cout.tie(0);
  int t = 1;
  while (t-- > 0) {
    solve();
  }
  return 0;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 122 ms 3052 KB Output is correct
5 Correct 116 ms 2924 KB Output is correct
6 Correct 129 ms 2924 KB Output is correct
7 Correct 115 ms 2924 KB Output is correct
8 Correct 123 ms 2924 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Correct 3 ms 2796 KB Output is correct
12 Correct 10 ms 2796 KB Output is correct
13 Correct 10 ms 2796 KB Output is correct
14 Correct 11 ms 2796 KB Output is correct
15 Correct 4 ms 2796 KB Output is correct
16 Correct 5 ms 2796 KB Output is correct
17 Correct 4 ms 2796 KB Output is correct
18 Correct 4 ms 2796 KB Output is correct
19 Correct 4 ms 2796 KB Output is correct
20 Correct 4 ms 2796 KB Output is correct
21 Correct 5 ms 2796 KB Output is correct
22 Correct 4 ms 2796 KB Output is correct

Subtask #2
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2816 KB Output is correct
4 Correct 122 ms 2924 KB Output is correct
5 Execution timed out 1548 ms 4372 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 122 ms 3052 KB Output is correct
5 Correct 116 ms 2924 KB Output is correct
6 Correct 129 ms 2924 KB Output is correct
7 Correct 115 ms 2924 KB Output is correct
8 Correct 123 ms 2924 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Correct 3 ms 2796 KB Output is correct
12 Correct 10 ms 2796 KB Output is correct
13 Correct 10 ms 2796 KB Output is correct
14 Correct 11 ms 2796 KB Output is correct
15 Correct 4 ms 2796 KB Output is correct
16 Correct 5 ms 2796 KB Output is correct
17 Correct 4 ms 2796 KB Output is correct
18 Correct 4 ms 2796 KB Output is correct
19 Correct 4 ms 2796 KB Output is correct
20 Correct 4 ms 2796 KB Output is correct
21 Correct 5 ms 2796 KB Output is correct
22 Correct 4 ms 2796 KB Output is correct
23 Correct 2 ms 2796 KB Output is correct
24 Correct 2 ms 2796 KB Output is correct
25 Correct 3 ms 2816 KB Output is correct
26 Correct 122 ms 2924 KB Output is correct
27 Execution timed out 1548 ms 4372 KB Time limit exceeded
28 Halted 0 ms 0 KB -