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답안 #860351

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
860351 2023-10-12T17:11:23 Z serifefedartar Janjetina (COCI21_janjetina) C++17
110 / 110
 291 ms 16020 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
#define s second
#define f first
typedef long long ll;
const ll MOD = 1e9 + 7;
const ll LOGN = 18; 
const ll MAXN = 1e5 + 100;

vector<vector<pair<int,int>>> graph;
int marked[MAXN], sz[MAXN], fen[MAXN], k;
ll ans = 0;
ll get(int k) {
	k++;
	if (k <= 0)
		return 0;
	ll res = 0;
	while (k) {
		res += fen[k];
		k -= k & -k;
	}
	return res;
}

void update(int k, int v) {
	k++;
	while (k < MAXN) {
		fen[k] += v;
		k += k & -k;
	}
}

int get_sz(int node, int parent) {
	sz[node] = 1;
	for (auto u : graph[node]) {
		if (u.f == parent || marked[u.f])
			continue;
		sz[node] += get_sz(u.f, node);
	}
	return sz[node];
}

int find_centro(int node, int parent, int n) {
	for (auto u : graph[node]) {
		if (u.f != parent && !marked[u.f] && sz[u.f] * 2 >= n)
			return find_centro(u.f, node, n);
	}
	return node;
}

vector<pair<int,int>> v;
void dfs(int node, int parent, int mx, int len) {
	v.push_back({mx, len});
	for (auto u : graph[node]) {
		if (u.f != parent && !marked[u.f])
			dfs(u.f, node, max(mx, u.s), len+1);
	}
}

ll calc(int node, int parent, int mx, int len) {
	v.clear();
	dfs(node, parent, mx, len);
	sort(v.begin(), v.end());

	ll ret = 0;
	for (auto u : v) {
		int val = u.f - u.s;
		ret += get(val - k);
		update(u.s, 1);
	}
	for (auto u : v)
		update(u.s, -1); 
	return ret;
}

void decompose(int node, int parent) {
	int n = get_sz(node, parent);
	int centro = find_centro(node, parent, n);

	ans += calc(centro, centro, 0, 0);
	marked[centro] = 1;
	for (auto u : graph[centro]) {
		if (!marked[u.f])
			ans -= calc(u.f, u.f, u.s, 1);
	}

	for (auto u : graph[centro]) {
		if (!marked[u.f])
			decompose(u.f, node);
	}
}

int main() {
	fast
	int n, x, y, w;
	cin >> n >> k;

	graph = vector<vector<pair<int,int>>>(n+1, vector<pair<int,int>>());
	for (int i = 1; i < n; i++) {
		cin >> x >> y >> w;
		graph[x].push_back({y, w});
		graph[y].push_back({x, w});
	}
	decompose(1, 1);
	cout << ans*2 << "\n";
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 472 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 2 ms 472 KB Output is correct
14 Correct 2 ms 348 KB Output is correct
15 Correct 2 ms 348 KB Output is correct
16 Correct 1 ms 520 KB Output is correct
17 Correct 1 ms 360 KB Output is correct
18 Correct 1 ms 352 KB Output is correct
19 Correct 2 ms 352 KB Output is correct
20 Correct 1 ms 352 KB Output is correct
21 Correct 2 ms 352 KB Output is correct
22 Correct 1 ms 352 KB Output is correct

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 352 KB Output is correct
2 Correct 0 ms 464 KB Output is correct
3 Correct 0 ms 352 KB Output is correct
4 Correct 2 ms 608 KB Output is correct
5 Correct 19 ms 2228 KB Output is correct
6 Correct 125 ms 8148 KB Output is correct
7 Correct 232 ms 15332 KB Output is correct
8 Correct 284 ms 15880 KB Output is correct
9 Correct 249 ms 15300 KB Output is correct
10 Correct 279 ms 15752 KB Output is correct
11 Correct 240 ms 15312 KB Output is correct
12 Correct 273 ms 15808 KB Output is correct
13 Correct 252 ms 16020 KB Output is correct
14 Correct 282 ms 15620 KB Output is correct
15 Correct 284 ms 15636 KB Output is correct
16 Correct 267 ms 15816 KB Output is correct
17 Correct 269 ms 15764 KB Output is correct
18 Correct 291 ms 15668 KB Output is correct

Subtask #3
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 472 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 2 ms 472 KB Output is correct
14 Correct 2 ms 348 KB Output is correct
15 Correct 2 ms 348 KB Output is correct
16 Correct 1 ms 520 KB Output is correct
17 Correct 1 ms 360 KB Output is correct
18 Correct 1 ms 352 KB Output is correct
19 Correct 2 ms 352 KB Output is correct
20 Correct 1 ms 352 KB Output is correct
21 Correct 2 ms 352 KB Output is correct
22 Correct 1 ms 352 KB Output is correct
23 Correct 1 ms 352 KB Output is correct
24 Correct 0 ms 464 KB Output is correct
25 Correct 0 ms 352 KB Output is correct
26 Correct 2 ms 608 KB Output is correct
27 Correct 19 ms 2228 KB Output is correct
28 Correct 125 ms 8148 KB Output is correct
29 Correct 232 ms 15332 KB Output is correct
30 Correct 284 ms 15880 KB Output is correct
31 Correct 249 ms 15300 KB Output is correct
32 Correct 279 ms 15752 KB Output is correct
33 Correct 240 ms 15312 KB Output is correct
34 Correct 273 ms 15808 KB Output is correct
35 Correct 252 ms 16020 KB Output is correct
36 Correct 282 ms 15620 KB Output is correct
37 Correct 284 ms 15636 KB Output is correct
38 Correct 267 ms 15816 KB Output is correct
39 Correct 269 ms 15764 KB Output is correct
40 Correct 291 ms 15668 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 236 ms 15356 KB Output is correct
43 Correct 266 ms 15812 KB Output is correct
44 Correct 246 ms 15340 KB Output is correct
45 Correct 278 ms 15812 KB Output is correct
46 Correct 234 ms 15316 KB Output is correct
47 Correct 268 ms 15812 KB Output is correct
48 Correct 251 ms 15968 KB Output is correct
49 Correct 279 ms 15768 KB Output is correct
50 Correct 283 ms 15436 KB Output is correct
51 Correct 279 ms 15636 KB Output is correct
52 Correct 109 ms 9924 KB Output is correct
53 Correct 108 ms 10184 KB Output is correct
54 Correct 86 ms 9940 KB Output is correct
55 Correct 103 ms 10196 KB Output is correct
56 Correct 104 ms 10368 KB Output is correct
57 Correct 212 ms 9680 KB Output is correct
58 Correct 237 ms 9932 KB Output is correct
59 Correct 223 ms 9884 KB Output is correct
60 Correct 247 ms 9932 KB Output is correct
61 Correct 242 ms 9936 KB Output is correct
62 Correct 180 ms 9648 KB Output is correct
63 Correct 207 ms 9928 KB Output is correct
64 Correct 229 ms 9928 KB Output is correct
65 Correct 9 ms 860 KB Output is correct
66 Correct 0 ms 468 KB Output is correct