#include <bits/stdc++.h>
using namespace std;
void just_do_it();
int main() {
#ifdef KAMIRULEZ
freopen("kamirulez.inp", "r", stdin);
freopen("kamirulez.out", "w", stdout);
#endif
ios_base::sync_with_stdio(0);
cin.tie(0);
just_do_it();
return 0;
}
const int inf = 1e9 + 20;
const int maxN = 2e5 + 20;
const int maxL = 20;
vector<int> adj[maxN];
bool done[maxN];
int dist[maxL][maxN];
int depth[maxN];
int par[maxN];
int sz[maxN];
int best[maxN];
pair<int, int> order[maxN];
void dfs_dist(int u, int p, int d) {
for (auto v: adj[u]) {
if (v != p && !done[v]) {
dist[d][v] = dist[d][u] + 1;
dfs_dist(v, u, d);
}
}
}
void dfs_size(int u, int p) {
sz[u] = 1;
for (auto v: adj[u]) {
if (v != p && !done[v]) {
dfs_size(v, u);
sz[u] += sz[v];
}
}
}
int find_cen(int r, int u, int p) {
for (auto v: adj[u]) {
if (v != p && !done[v] && sz[v] * 2 > sz[r]) {
return find_cen(r, v, u);
}
}
return u;
}
void build(int u, int p, int d) {
dfs_size(u, -1);
u = find_cen(u, u, -1);
par[u] = p;
depth[u] = d;
dist[d][u] = 0;
dfs_dist(u, -1, d);
done[u] = true;
for (auto v: adj[u]) {
if (!done[v]) {
build(v, u, d + 1);
}
}
}
void just_do_it() {
int N, D;
cin >> N >> D;
for (int v = 2; v <= N; v++) {
int u;
cin >> u;
u++;
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs_dist(1, -1, 0);
for (int i = 1; i <= N; i++) {
order[i] = {dist[0][i], i};
}
sort(order + 1, order + N + 1, greater<pair<int, int>>());
build(1, -1, 0);
for (int i = 1; i <= N; i++) {
best[i] = inf;
}
int res = 0;
for (int i = 1; i <= N; i++) {
int u = order[i].second;
int min_D = inf;
for (int d = depth[u], p = u; d >= 0; d--, p = par[p]) {
min_D = min(min_D, best[p] + dist[d][u]);
}
if (min_D >= D) {
res++;
for (int d = depth[u], p = u; d >= 0; d--, p = par[p]) {
best[p] = min(best[p], dist[d][u]);
}
}
}
cout << res;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
11100 KB |
Output is correct |
2 |
Correct |
2 ms |
13184 KB |
Output is correct |
3 |
Correct |
3 ms |
13208 KB |
Output is correct |
4 |
Correct |
2 ms |
13208 KB |
Output is correct |
5 |
Correct |
2 ms |
13148 KB |
Output is correct |
6 |
Correct |
2 ms |
13148 KB |
Output is correct |
7 |
Correct |
2 ms |
13144 KB |
Output is correct |
8 |
Correct |
2 ms |
13148 KB |
Output is correct |
9 |
Correct |
2 ms |
13152 KB |
Output is correct |
10 |
Correct |
2 ms |
13148 KB |
Output is correct |
11 |
Correct |
3 ms |
11160 KB |
Output is correct |
12 |
Correct |
2 ms |
11104 KB |
Output is correct |
13 |
Correct |
2 ms |
11104 KB |
Output is correct |
14 |
Correct |
2 ms |
11104 KB |
Output is correct |
15 |
Correct |
2 ms |
11164 KB |
Output is correct |
16 |
Correct |
2 ms |
13204 KB |
Output is correct |
17 |
Correct |
2 ms |
13148 KB |
Output is correct |
18 |
Correct |
2 ms |
13144 KB |
Output is correct |
19 |
Correct |
2 ms |
13148 KB |
Output is correct |
20 |
Correct |
2 ms |
13148 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
11100 KB |
Output is correct |
2 |
Correct |
2 ms |
13184 KB |
Output is correct |
3 |
Correct |
3 ms |
13208 KB |
Output is correct |
4 |
Correct |
2 ms |
13208 KB |
Output is correct |
5 |
Correct |
2 ms |
13148 KB |
Output is correct |
6 |
Correct |
2 ms |
13148 KB |
Output is correct |
7 |
Correct |
2 ms |
13144 KB |
Output is correct |
8 |
Correct |
2 ms |
13148 KB |
Output is correct |
9 |
Correct |
2 ms |
13152 KB |
Output is correct |
10 |
Correct |
2 ms |
13148 KB |
Output is correct |
11 |
Correct |
3 ms |
11160 KB |
Output is correct |
12 |
Correct |
2 ms |
11104 KB |
Output is correct |
13 |
Correct |
2 ms |
11104 KB |
Output is correct |
14 |
Correct |
2 ms |
11104 KB |
Output is correct |
15 |
Correct |
2 ms |
11164 KB |
Output is correct |
16 |
Correct |
2 ms |
13204 KB |
Output is correct |
17 |
Correct |
2 ms |
13148 KB |
Output is correct |
18 |
Correct |
2 ms |
13144 KB |
Output is correct |
19 |
Correct |
2 ms |
13148 KB |
Output is correct |
20 |
Correct |
2 ms |
13148 KB |
Output is correct |
21 |
Correct |
4 ms |
19548 KB |
Output is correct |
22 |
Correct |
3 ms |
15196 KB |
Output is correct |
23 |
Correct |
3 ms |
15196 KB |
Output is correct |
24 |
Correct |
3 ms |
15196 KB |
Output is correct |
25 |
Correct |
4 ms |
17252 KB |
Output is correct |
26 |
Correct |
3 ms |
17252 KB |
Output is correct |
27 |
Correct |
3 ms |
17252 KB |
Output is correct |
28 |
Correct |
4 ms |
17252 KB |
Output is correct |
29 |
Correct |
3 ms |
17432 KB |
Output is correct |
30 |
Correct |
4 ms |
17252 KB |
Output is correct |
31 |
Correct |
3 ms |
17316 KB |
Output is correct |
32 |
Correct |
3 ms |
13156 KB |
Output is correct |
33 |
Correct |
2 ms |
13148 KB |
Output is correct |
34 |
Correct |
3 ms |
15448 KB |
Output is correct |
35 |
Correct |
3 ms |
15196 KB |
Output is correct |
36 |
Correct |
3 ms |
15384 KB |
Output is correct |
37 |
Correct |
3 ms |
15196 KB |
Output is correct |
38 |
Correct |
4 ms |
19356 KB |
Output is correct |
39 |
Correct |
4 ms |
19292 KB |
Output is correct |
40 |
Correct |
4 ms |
19800 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
11100 KB |
Output is correct |
2 |
Correct |
2 ms |
13184 KB |
Output is correct |
3 |
Correct |
3 ms |
13208 KB |
Output is correct |
4 |
Correct |
2 ms |
13208 KB |
Output is correct |
5 |
Correct |
2 ms |
13148 KB |
Output is correct |
6 |
Correct |
2 ms |
13148 KB |
Output is correct |
7 |
Correct |
2 ms |
13144 KB |
Output is correct |
8 |
Correct |
2 ms |
13148 KB |
Output is correct |
9 |
Correct |
2 ms |
13152 KB |
Output is correct |
10 |
Correct |
2 ms |
13148 KB |
Output is correct |
11 |
Correct |
3 ms |
11160 KB |
Output is correct |
12 |
Correct |
2 ms |
11104 KB |
Output is correct |
13 |
Correct |
2 ms |
11104 KB |
Output is correct |
14 |
Correct |
2 ms |
11104 KB |
Output is correct |
15 |
Correct |
2 ms |
11164 KB |
Output is correct |
16 |
Correct |
2 ms |
13204 KB |
Output is correct |
17 |
Correct |
2 ms |
13148 KB |
Output is correct |
18 |
Correct |
2 ms |
13144 KB |
Output is correct |
19 |
Correct |
2 ms |
13148 KB |
Output is correct |
20 |
Correct |
2 ms |
13148 KB |
Output is correct |
21 |
Correct |
4 ms |
19548 KB |
Output is correct |
22 |
Correct |
3 ms |
15196 KB |
Output is correct |
23 |
Correct |
3 ms |
15196 KB |
Output is correct |
24 |
Correct |
3 ms |
15196 KB |
Output is correct |
25 |
Correct |
4 ms |
17252 KB |
Output is correct |
26 |
Correct |
3 ms |
17252 KB |
Output is correct |
27 |
Correct |
3 ms |
17252 KB |
Output is correct |
28 |
Correct |
4 ms |
17252 KB |
Output is correct |
29 |
Correct |
3 ms |
17432 KB |
Output is correct |
30 |
Correct |
4 ms |
17252 KB |
Output is correct |
31 |
Correct |
3 ms |
17316 KB |
Output is correct |
32 |
Correct |
3 ms |
13156 KB |
Output is correct |
33 |
Correct |
2 ms |
13148 KB |
Output is correct |
34 |
Correct |
3 ms |
15448 KB |
Output is correct |
35 |
Correct |
3 ms |
15196 KB |
Output is correct |
36 |
Correct |
3 ms |
15384 KB |
Output is correct |
37 |
Correct |
3 ms |
15196 KB |
Output is correct |
38 |
Correct |
4 ms |
19356 KB |
Output is correct |
39 |
Correct |
4 ms |
19292 KB |
Output is correct |
40 |
Correct |
4 ms |
19800 KB |
Output is correct |
41 |
Correct |
63 ms |
24312 KB |
Output is correct |
42 |
Correct |
81 ms |
26264 KB |
Output is correct |
43 |
Correct |
79 ms |
26192 KB |
Output is correct |
44 |
Correct |
74 ms |
26280 KB |
Output is correct |
45 |
Correct |
79 ms |
26260 KB |
Output is correct |
46 |
Correct |
230 ms |
31060 KB |
Output is correct |
47 |
Correct |
265 ms |
31056 KB |
Output is correct |
48 |
Correct |
274 ms |
31032 KB |
Output is correct |
49 |
Correct |
268 ms |
31276 KB |
Output is correct |
50 |
Correct |
54 ms |
22444 KB |
Output is correct |
51 |
Correct |
43 ms |
24236 KB |
Output is correct |
52 |
Correct |
41 ms |
22276 KB |
Output is correct |
53 |
Correct |
176 ms |
29520 KB |
Output is correct |
54 |
Correct |
147 ms |
29672 KB |
Output is correct |
55 |
Correct |
104 ms |
29520 KB |
Output is correct |
56 |
Correct |
5 ms |
19548 KB |
Output is correct |
57 |
Correct |
13 ms |
24156 KB |
Output is correct |
58 |
Correct |
64 ms |
35164 KB |
Output is correct |
59 |
Correct |
232 ms |
40836 KB |
Output is correct |
60 |
Correct |
63 ms |
24708 KB |
Output is correct |
61 |
Correct |
98 ms |
26368 KB |
Output is correct |