#include <bits/stdc++.h>
using namespace std;
const int N = 2e5;
vector<pair<int, int>> adj[N];
int sz[N];
bool vis[N];
int res;
map<int, int> mn;
vector<pair<int, int>> cand;
int dfsSz(int u, int p) {
sz[u] = 1;
for (pair<int, int> v : adj[u]) {
if (v.first != p && !vis[v.first]) {
sz[u] += dfsSz(v.first, u);
}
}
return sz[u];
}
int centroid(int u, int p, int siz) {
for (pair<int, int> v : adj[u]) {
if (v.first != p && !vis[v.first] && sz[v.first] > siz / 2) {
return centroid(v.first, u, siz);
}
}
return u;
}
void dfs(int u, int p, int len, int d) {
cand.emplace_back(len, d);
for (pair<int, int> v : adj[u]) {
if (v.first != p && !vis[v.first]) {
dfs(v.first, u, len + v.second, d + 1);
}
}
}
void build(int u, int k) {
dfsSz(u, -1);
int c = centroid(u, -1, sz[u]);
mn[0] = 0;
for (pair<int, int> v : adj[c]) {
if (!vis[v.first]) {
dfs(v.first, c, v.second, 1);
for (pair<int, int> x : cand) {
int len = x.first;
int d = x.second;
if (mn.find(k - len) != mn.end()) {
res = min(res, mn[k - len] + d);
}
}
for (pair<int, int> x : cand) {
if (mn.find(x.first) == mn.end()) {
mn[x.first] = x.second;
} else {
mn[x.first] = min(mn[x.first], x.second);
}
}
cand.clear();
}
}
mn.clear();
vis[c] = true;
for (pair<int, int> v : adj[c]) {
if (!vis[v.first]) {
build(v.first, k);
}
}
}
int best_path(int n, int k, int h[][2], int l[]) {
for (int i = 0; i < n - 1; i++) {
adj[h[i][0]].emplace_back(h[i][1], l[i]);
adj[h[i][1]].emplace_back(h[i][0], l[i]);
}
res = 1e9;
build(1, k);
return (res == 1e9 ? -1 : res);
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4996 KB |
Output is correct |
| 4 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 6 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4992 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 10 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 17 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4948 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4996 KB |
Output is correct |
| 4 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 6 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4992 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 10 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 17 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 19 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 20 |
Correct |
4 ms |
4948 KB |
Output is correct |
| 21 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 22 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 23 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 24 |
Correct |
4 ms |
5020 KB |
Output is correct |
| 25 |
Correct |
4 ms |
5024 KB |
Output is correct |
| 26 |
Correct |
4 ms |
5028 KB |
Output is correct |
| 27 |
Correct |
3 ms |
5076 KB |
Output is correct |
| 28 |
Correct |
4 ms |
5024 KB |
Output is correct |
| 29 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 30 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 31 |
Correct |
4 ms |
5136 KB |
Output is correct |
| 32 |
Correct |
4 ms |
5028 KB |
Output is correct |
| 33 |
Correct |
5 ms |
5024 KB |
Output is correct |
| 34 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 35 |
Correct |
5 ms |
5064 KB |
Output is correct |
| 36 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 37 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 38 |
Correct |
5 ms |
5076 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4996 KB |
Output is correct |
| 4 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 6 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4992 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 10 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 17 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 19 |
Correct |
203 ms |
10768 KB |
Output is correct |
| 20 |
Correct |
205 ms |
11180 KB |
Output is correct |
| 21 |
Correct |
196 ms |
11084 KB |
Output is correct |
| 22 |
Correct |
187 ms |
11112 KB |
Output is correct |
| 23 |
Correct |
262 ms |
11344 KB |
Output is correct |
| 24 |
Correct |
158 ms |
10956 KB |
Output is correct |
| 25 |
Correct |
176 ms |
16248 KB |
Output is correct |
| 26 |
Correct |
95 ms |
16788 KB |
Output is correct |
| 27 |
Correct |
284 ms |
16200 KB |
Output is correct |
| 28 |
Correct |
776 ms |
36544 KB |
Output is correct |
| 29 |
Correct |
781 ms |
32532 KB |
Output is correct |
| 30 |
Correct |
304 ms |
16488 KB |
Output is correct |
| 31 |
Correct |
283 ms |
16384 KB |
Output is correct |
| 32 |
Correct |
314 ms |
16584 KB |
Output is correct |
| 33 |
Correct |
444 ms |
16064 KB |
Output is correct |
| 34 |
Correct |
718 ms |
25024 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4996 KB |
Output is correct |
| 4 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 6 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4992 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 10 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 17 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 19 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 20 |
Correct |
4 ms |
4948 KB |
Output is correct |
| 21 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 22 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 23 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 24 |
Correct |
4 ms |
5020 KB |
Output is correct |
| 25 |
Correct |
4 ms |
5024 KB |
Output is correct |
| 26 |
Correct |
4 ms |
5028 KB |
Output is correct |
| 27 |
Correct |
3 ms |
5076 KB |
Output is correct |
| 28 |
Correct |
4 ms |
5024 KB |
Output is correct |
| 29 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 30 |
Correct |
4 ms |
5076 KB |
Output is correct |
| 31 |
Correct |
4 ms |
5136 KB |
Output is correct |
| 32 |
Correct |
4 ms |
5028 KB |
Output is correct |
| 33 |
Correct |
5 ms |
5024 KB |
Output is correct |
| 34 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 35 |
Correct |
5 ms |
5064 KB |
Output is correct |
| 36 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 37 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 38 |
Correct |
5 ms |
5076 KB |
Output is correct |
| 39 |
Correct |
203 ms |
10768 KB |
Output is correct |
| 40 |
Correct |
205 ms |
11180 KB |
Output is correct |
| 41 |
Correct |
196 ms |
11084 KB |
Output is correct |
| 42 |
Correct |
187 ms |
11112 KB |
Output is correct |
| 43 |
Correct |
262 ms |
11344 KB |
Output is correct |
| 44 |
Correct |
158 ms |
10956 KB |
Output is correct |
| 45 |
Correct |
176 ms |
16248 KB |
Output is correct |
| 46 |
Correct |
95 ms |
16788 KB |
Output is correct |
| 47 |
Correct |
284 ms |
16200 KB |
Output is correct |
| 48 |
Correct |
776 ms |
36544 KB |
Output is correct |
| 49 |
Correct |
781 ms |
32532 KB |
Output is correct |
| 50 |
Correct |
304 ms |
16488 KB |
Output is correct |
| 51 |
Correct |
283 ms |
16384 KB |
Output is correct |
| 52 |
Correct |
314 ms |
16584 KB |
Output is correct |
| 53 |
Correct |
444 ms |
16064 KB |
Output is correct |
| 54 |
Correct |
718 ms |
25024 KB |
Output is correct |
| 55 |
Correct |
24 ms |
5888 KB |
Output is correct |
| 56 |
Correct |
13 ms |
5716 KB |
Output is correct |
| 57 |
Correct |
125 ms |
11600 KB |
Output is correct |
| 58 |
Correct |
43 ms |
10960 KB |
Output is correct |
| 59 |
Correct |
270 ms |
20532 KB |
Output is correct |
| 60 |
Correct |
782 ms |
30892 KB |
Output is correct |
| 61 |
Correct |
306 ms |
17740 KB |
Output is correct |
| 62 |
Correct |
269 ms |
16588 KB |
Output is correct |
| 63 |
Correct |
358 ms |
16588 KB |
Output is correct |
| 64 |
Correct |
779 ms |
21336 KB |
Output is correct |
| 65 |
Correct |
733 ms |
26292 KB |
Output is correct |
| 66 |
Correct |
782 ms |
35644 KB |
Output is correct |
| 67 |
Correct |
126 ms |
16696 KB |
Output is correct |
| 68 |
Correct |
430 ms |
25044 KB |
Output is correct |
| 69 |
Correct |
458 ms |
25364 KB |
Output is correct |
| 70 |
Correct |
400 ms |
24204 KB |
Output is correct |
