#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pii;
#define pb push_back
#define f first
#define s second
const int maxn = 2e5 + 1;
vector<pii> adj[maxn];
map<ll, ll> info[maxn];
ll dist[maxn], sum[maxn];
int N, K;
ll ret;
void precomp(int u, int p, ll c, int h) {
info[u][c] = h;
sum[u] = c;
dist[u] = h;
for (auto n : adj[u]) {
if (p == n.f) {
continue;
}
precomp(n.f, u, c + n.s, h + 1);
}
}
void small_to_large_merge(int u, int p) {
ll target = K + 2 * sum[u];
for (auto n : adj[u]) {
if (n.f == p) {
continue;
}
small_to_large_merge(n.f, u);
if (info[n.f].size() > info[u].size()) { swap(info[n.f], info[u]); }
for (auto i : info[n.f]) {
if (info[u].find(target - i.f) != info[u].end()) {
ret = min(ret, info[u][target - i.f] + i.s - 2 * dist[u]);
}
}
for (auto i : info[n.f]) {
if (info[u].find(i.f) == info[u].end()) {
info[u].insert(i);
} else {
info[u][i.f] = min(info[u][i.f], i.s);
}
}
}
}
int best_path(int n, int k, int edges[][2], int weights[]) {
if (k == 1) {
return 0;
}
N = n;
K = k;
ret = INT_MAX;
for (int i = 0; i < n - 1; i++) {
int u = edges[i][0];
int v = edges[i][1];
adj[u].pb(pii(v, weights[i]));
adj[v].pb(pii(u, weights[i]));
}
precomp(0, -1, 0, 0);
small_to_large_merge(0, -1);
return ret == INT_MAX ? -1 : ret;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 2 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 3 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 7 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 8 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 9 |
Correct |
3 ms |
21292 KB |
Output is correct |
| 10 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 11 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 13 |
Correct |
3 ms |
21080 KB |
Output is correct |
| 14 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 15 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 16 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 18 |
Correct |
3 ms |
21084 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 2 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 3 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 7 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 8 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 9 |
Correct |
3 ms |
21292 KB |
Output is correct |
| 10 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 11 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 13 |
Correct |
3 ms |
21080 KB |
Output is correct |
| 14 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 15 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 16 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 18 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 19 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 20 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 21 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 22 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 23 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 24 |
Correct |
3 ms |
21596 KB |
Output is correct |
| 25 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 26 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 27 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 28 |
Correct |
3 ms |
21596 KB |
Output is correct |
| 29 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 30 |
Correct |
4 ms |
21544 KB |
Output is correct |
| 31 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 32 |
Correct |
4 ms |
21336 KB |
Output is correct |
| 33 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 34 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 35 |
Correct |
3 ms |
21556 KB |
Output is correct |
| 36 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 37 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 38 |
Correct |
4 ms |
21340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 2 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 3 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 7 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 8 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 9 |
Correct |
3 ms |
21292 KB |
Output is correct |
| 10 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 11 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 13 |
Correct |
3 ms |
21080 KB |
Output is correct |
| 14 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 15 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 16 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 18 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 19 |
Correct |
82 ms |
44196 KB |
Output is correct |
| 20 |
Correct |
79 ms |
45140 KB |
Output is correct |
| 21 |
Correct |
73 ms |
44452 KB |
Output is correct |
| 22 |
Correct |
91 ms |
44764 KB |
Output is correct |
| 23 |
Correct |
113 ms |
57804 KB |
Output is correct |
| 24 |
Correct |
105 ms |
47700 KB |
Output is correct |
| 25 |
Correct |
67 ms |
46164 KB |
Output is correct |
| 26 |
Correct |
47 ms |
53780 KB |
Output is correct |
| 27 |
Correct |
143 ms |
54924 KB |
Output is correct |
| 28 |
Correct |
218 ms |
96972 KB |
Output is correct |
| 29 |
Correct |
214 ms |
95572 KB |
Output is correct |
| 30 |
Correct |
135 ms |
55396 KB |
Output is correct |
| 31 |
Correct |
145 ms |
55356 KB |
Output is correct |
| 32 |
Correct |
203 ms |
55440 KB |
Output is correct |
| 33 |
Correct |
172 ms |
60500 KB |
Output is correct |
| 34 |
Correct |
254 ms |
92672 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 2 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 3 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 7 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 8 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 9 |
Correct |
3 ms |
21292 KB |
Output is correct |
| 10 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 11 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 13 |
Correct |
3 ms |
21080 KB |
Output is correct |
| 14 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 15 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 16 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 18 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 19 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 20 |
Correct |
3 ms |
21084 KB |
Output is correct |
| 21 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 22 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 23 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 24 |
Correct |
3 ms |
21596 KB |
Output is correct |
| 25 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 26 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 27 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 28 |
Correct |
3 ms |
21596 KB |
Output is correct |
| 29 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 30 |
Correct |
4 ms |
21544 KB |
Output is correct |
| 31 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 32 |
Correct |
4 ms |
21336 KB |
Output is correct |
| 33 |
Correct |
4 ms |
21596 KB |
Output is correct |
| 34 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 35 |
Correct |
3 ms |
21556 KB |
Output is correct |
| 36 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 37 |
Correct |
3 ms |
21340 KB |
Output is correct |
| 38 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 39 |
Correct |
82 ms |
44196 KB |
Output is correct |
| 40 |
Correct |
79 ms |
45140 KB |
Output is correct |
| 41 |
Correct |
73 ms |
44452 KB |
Output is correct |
| 42 |
Correct |
91 ms |
44764 KB |
Output is correct |
| 43 |
Correct |
113 ms |
57804 KB |
Output is correct |
| 44 |
Correct |
105 ms |
47700 KB |
Output is correct |
| 45 |
Correct |
67 ms |
46164 KB |
Output is correct |
| 46 |
Correct |
47 ms |
53780 KB |
Output is correct |
| 47 |
Correct |
143 ms |
54924 KB |
Output is correct |
| 48 |
Correct |
218 ms |
96972 KB |
Output is correct |
| 49 |
Correct |
214 ms |
95572 KB |
Output is correct |
| 50 |
Correct |
135 ms |
55396 KB |
Output is correct |
| 51 |
Correct |
145 ms |
55356 KB |
Output is correct |
| 52 |
Correct |
203 ms |
55440 KB |
Output is correct |
| 53 |
Correct |
172 ms |
60500 KB |
Output is correct |
| 54 |
Correct |
254 ms |
92672 KB |
Output is correct |
| 55 |
Correct |
13 ms |
24408 KB |
Output is correct |
| 56 |
Correct |
8 ms |
22892 KB |
Output is correct |
| 57 |
Correct |
46 ms |
41704 KB |
Output is correct |
| 58 |
Correct |
37 ms |
35524 KB |
Output is correct |
| 59 |
Correct |
72 ms |
60288 KB |
Output is correct |
| 60 |
Correct |
206 ms |
95828 KB |
Output is correct |
| 61 |
Correct |
161 ms |
58044 KB |
Output is correct |
| 62 |
Correct |
140 ms |
55460 KB |
Output is correct |
| 63 |
Correct |
174 ms |
55376 KB |
Output is correct |
| 64 |
Correct |
321 ms |
108700 KB |
Output is correct |
| 65 |
Correct |
314 ms |
108396 KB |
Output is correct |
| 66 |
Correct |
215 ms |
89424 KB |
Output is correct |
| 67 |
Correct |
107 ms |
49956 KB |
Output is correct |
| 68 |
Correct |
256 ms |
71536 KB |
Output is correct |
| 69 |
Correct |
264 ms |
73808 KB |
Output is correct |
| 70 |
Correct |
234 ms |
69972 KB |
Output is correct |
