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답안 #560594

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
560594 2022-05-11T17:31:17 Z prarie Janjetina (COCI21_janjetina) C++17
35 / 110
 400 ms 16912 KB 
#include <bits/stdc++.h>
 
#define fastio ios_base::sync_with_stdio(0), cin.tie(0)
#define endl '\n'
#define fi first
#define se second
#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define compress(v) sort(all(v)), (v).erase(unique(all((v))), v.end())
#define pb push_back
#define eb emplace_back
 
using namespace std;
 
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using ld = long double;
 
template <typename T>
inline void Mx(T &x, T y) { x < y && (x = y); }
template <typename T>
inline void Mn(T &x, T y) { x > y && (x = y); }


template <typename T>
struct Fenwick {
	int n;
	vector<T> tree;

	Fenwick(int _n) : n(_n) {
		tree.resize(n);
	}

	void update(int x, T v) {
		for (int i = x; i < n; i += i & -i)
			tree[i] += v;
	}

	T query(int x) {
		T ret = 0;
		for (int i = x; i > 0; i -= i & -i)
			ret += tree[i];
		return ret;
	}

	T query(int l, int r) {
		return query(r) - query(l - 1);
	}
};

const int MX = 1e5 + 5;

int N, K;
ll ans;
vector<pii> adj[MX];

int t_siz[MX];
bool fin[MX];
Fenwick<int> tree_cnt(MX);
int qn;
array<int, 3> que[MX];

int getCent(int cur, int pv, int t_size) {
	for (auto &nxt : adj[cur]) {
		if (nxt.first == pv || fin[nxt.first]) {
			continue;
		}
		if (t_size < 2 * t_siz[nxt.first]) {
			return getCent(nxt.first, cur, t_size);
		}
	}
	return cur;
}
 
void getSz(int cur, int pv) {
	t_siz[cur] = 1;
	for (auto &nxt : adj[cur]) {
		if (nxt.first == pv || fin[nxt.first]) {
			continue;
		}
		getSz(nxt.first, cur);
		t_siz[cur] += t_siz[nxt.first];
	}
}

int dfs(int cur, int pv, int type, int mx, int d) {
	int ret = 1;
	que[qn++] = { mx, d, type };
	tree_cnt.update(d, 1);
	for (auto &nxt : adj[cur]) {
		if (nxt.first == pv || fin[nxt.first]) {
			continue;
		}
		ret += dfs(nxt.first, cur, type, max(mx, nxt.second), d + 1);
	}
	return ret;
}

void solve(int node) {
	getSz(node, -1);
	int cent = getCent(node, -1, t_siz[node]);
	fin[cent] = true;
	qn = 0;
	vector<int> S;
	vector<vector<int>> Z;
	for (auto &nxt : adj[cent]) {
		if (fin[nxt.first]) {
			continue;
		}
		S.pb(dfs(nxt.first, -1, sz(S), nxt.second, 1));
		Z.pb(vector<int>());
		int z = sz(Z) - 1;
		int s = S.back();
		for (int i = qn - s; i < qn; i++) {
			Z[z].pb(que[i][1]);
		}
		sort(all(Z[z]));
	}
	sort(que, que + qn);
	for (int i = qn - 1; i >= 0; i--) {
		auto &[mx, d, type] = que[i];

		int T = mx - (d + K);
		if (T >= 0) {
			ans += 1;
			if (T > 0) {
				ans += tree_cnt.query(1, T);
				ans -= upper_bound(all(Z[type]), T) - Z[type].begin();
			}
		}
		tree_cnt.update(d, -1);
		Z[type].pop_back();
	}
	for (auto &nxt : adj[cent]) {
		if (fin[nxt.first]) {
			continue;
		}
		solve(nxt.first);
	}
}

int main() {
	fastio;
	cin >> N >> K;
	for (int i = 0; i < N - 1; i++) {
		int u, v, w;
		cin >> u >> v >> w;
		adj[u].eb(v, w);
		adj[v].eb(u, w);
	}

	solve(1);
	cout << ans * 2 << endl;
	return 0;
}

Subtask #1
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3028 KB Output is correct
2 Correct 3 ms 3028 KB Output is correct
3 Correct 3 ms 3028 KB Output is correct
4 Correct 5 ms 3156 KB Output is correct
5 Correct 4 ms 3092 KB Output is correct
6 Correct 5 ms 3096 KB Output is correct
7 Correct 5 ms 3156 KB Output is correct
8 Correct 4 ms 3092 KB Output is correct
9 Correct 3 ms 3156 KB Output is correct
10 Correct 4 ms 3088 KB Output is correct
11 Correct 3 ms 3156 KB Output is correct
12 Correct 3 ms 3092 KB Output is correct
13 Correct 3 ms 3156 KB Output is correct
14 Correct 4 ms 3096 KB Output is correct
15 Correct 3 ms 3156 KB Output is correct
16 Correct 5 ms 3100 KB Output is correct
17 Correct 3 ms 3156 KB Output is correct
18 Correct 3 ms 3156 KB Output is correct
19 Correct 3 ms 3156 KB Output is correct
20 Correct 3 ms 3096 KB Output is correct
21 Correct 3 ms 3156 KB Output is correct
22 Incorrect 3 ms 3156 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3028 KB Output is correct
2 Correct 3 ms 3028 KB Output is correct
3 Correct 2 ms 3088 KB Output is correct
4 Correct 4 ms 3156 KB Output is correct
5 Correct 24 ms 4344 KB Output is correct
6 Correct 182 ms 9880 KB Output is correct
7 Correct 309 ms 16364 KB Output is correct
8 Correct 362 ms 16848 KB Output is correct
9 Correct 336 ms 16460 KB Output is correct
10 Correct 400 ms 16772 KB Output is correct
11 Correct 361 ms 16272 KB Output is correct
12 Correct 394 ms 16912 KB Output is correct
13 Correct 375 ms 16464 KB Output is correct
14 Correct 369 ms 16760 KB Output is correct
15 Correct 334 ms 16624 KB Output is correct
16 Correct 369 ms 16764 KB Output is correct
17 Correct 317 ms 16852 KB Output is correct
18 Correct 336 ms 16632 KB Output is correct

Subtask #3
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3028 KB Output is correct
2 Correct 3 ms 3028 KB Output is correct
3 Correct 3 ms 3028 KB Output is correct
4 Correct 5 ms 3156 KB Output is correct
5 Correct 4 ms 3092 KB Output is correct
6 Correct 5 ms 3096 KB Output is correct
7 Correct 5 ms 3156 KB Output is correct
8 Correct 4 ms 3092 KB Output is correct
9 Correct 3 ms 3156 KB Output is correct
10 Correct 4 ms 3088 KB Output is correct
11 Correct 3 ms 3156 KB Output is correct
12 Correct 3 ms 3092 KB Output is correct
13 Correct 3 ms 3156 KB Output is correct
14 Correct 4 ms 3096 KB Output is correct
15 Correct 3 ms 3156 KB Output is correct
16 Correct 5 ms 3100 KB Output is correct
17 Correct 3 ms 3156 KB Output is correct
18 Correct 3 ms 3156 KB Output is correct
19 Correct 3 ms 3156 KB Output is correct
20 Correct 3 ms 3096 KB Output is correct
21 Correct 3 ms 3156 KB Output is correct
22 Incorrect 3 ms 3156 KB Output isn't correct
23 Halted 0 ms 0 KB -