#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]; // define these relative to root
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 |
5 ms |
21336 KB |
Output is correct |
| 2 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 3 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 7 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 8 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 9 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 10 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 11 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 13 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 14 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 15 |
Correct |
5 ms |
21080 KB |
Output is correct |
| 16 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 18 |
Correct |
4 ms |
21084 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 2 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 3 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 7 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 8 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 9 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 10 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 11 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 13 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 14 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 15 |
Correct |
5 ms |
21080 KB |
Output is correct |
| 16 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 18 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 19 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 20 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 21 |
Correct |
5 ms |
21344 KB |
Output is correct |
| 22 |
Correct |
7 ms |
21596 KB |
Output is correct |
| 23 |
Correct |
6 ms |
21592 KB |
Output is correct |
| 24 |
Correct |
5 ms |
21592 KB |
Output is correct |
| 25 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 26 |
Correct |
6 ms |
21596 KB |
Output is correct |
| 27 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 28 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 29 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 30 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 31 |
Correct |
5 ms |
21604 KB |
Output is correct |
| 32 |
Correct |
7 ms |
21348 KB |
Output is correct |
| 33 |
Correct |
6 ms |
21632 KB |
Output is correct |
| 34 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 35 |
Correct |
5 ms |
21564 KB |
Output is correct |
| 36 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 37 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 38 |
Correct |
5 ms |
21340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 2 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 3 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 7 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 8 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 9 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 10 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 11 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 13 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 14 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 15 |
Correct |
5 ms |
21080 KB |
Output is correct |
| 16 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 18 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 19 |
Correct |
112 ms |
44280 KB |
Output is correct |
| 20 |
Correct |
144 ms |
45220 KB |
Output is correct |
| 21 |
Correct |
110 ms |
44500 KB |
Output is correct |
| 22 |
Correct |
118 ms |
44848 KB |
Output is correct |
| 23 |
Correct |
147 ms |
57804 KB |
Output is correct |
| 24 |
Correct |
110 ms |
47628 KB |
Output is correct |
| 25 |
Correct |
106 ms |
46248 KB |
Output is correct |
| 26 |
Correct |
54 ms |
54096 KB |
Output is correct |
| 27 |
Correct |
171 ms |
54864 KB |
Output is correct |
| 28 |
Correct |
301 ms |
97052 KB |
Output is correct |
| 29 |
Correct |
276 ms |
95456 KB |
Output is correct |
| 30 |
Correct |
188 ms |
55288 KB |
Output is correct |
| 31 |
Correct |
205 ms |
55396 KB |
Output is correct |
| 32 |
Correct |
258 ms |
55496 KB |
Output is correct |
| 33 |
Correct |
272 ms |
60544 KB |
Output is correct |
| 34 |
Correct |
307 ms |
92756 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 2 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 3 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 4 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 5 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 6 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 7 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 8 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 9 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 10 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 11 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 12 |
Correct |
4 ms |
21080 KB |
Output is correct |
| 13 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 14 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 15 |
Correct |
5 ms |
21080 KB |
Output is correct |
| 16 |
Correct |
4 ms |
21340 KB |
Output is correct |
| 17 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 18 |
Correct |
4 ms |
21084 KB |
Output is correct |
| 19 |
Correct |
5 ms |
21084 KB |
Output is correct |
| 20 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 21 |
Correct |
5 ms |
21344 KB |
Output is correct |
| 22 |
Correct |
7 ms |
21596 KB |
Output is correct |
| 23 |
Correct |
6 ms |
21592 KB |
Output is correct |
| 24 |
Correct |
5 ms |
21592 KB |
Output is correct |
| 25 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 26 |
Correct |
6 ms |
21596 KB |
Output is correct |
| 27 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 28 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 29 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 30 |
Correct |
5 ms |
21596 KB |
Output is correct |
| 31 |
Correct |
5 ms |
21604 KB |
Output is correct |
| 32 |
Correct |
7 ms |
21348 KB |
Output is correct |
| 33 |
Correct |
6 ms |
21632 KB |
Output is correct |
| 34 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 35 |
Correct |
5 ms |
21564 KB |
Output is correct |
| 36 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 37 |
Correct |
5 ms |
21336 KB |
Output is correct |
| 38 |
Correct |
5 ms |
21340 KB |
Output is correct |
| 39 |
Correct |
112 ms |
44280 KB |
Output is correct |
| 40 |
Correct |
144 ms |
45220 KB |
Output is correct |
| 41 |
Correct |
110 ms |
44500 KB |
Output is correct |
| 42 |
Correct |
118 ms |
44848 KB |
Output is correct |
| 43 |
Correct |
147 ms |
57804 KB |
Output is correct |
| 44 |
Correct |
110 ms |
47628 KB |
Output is correct |
| 45 |
Correct |
106 ms |
46248 KB |
Output is correct |
| 46 |
Correct |
54 ms |
54096 KB |
Output is correct |
| 47 |
Correct |
171 ms |
54864 KB |
Output is correct |
| 48 |
Correct |
301 ms |
97052 KB |
Output is correct |
| 49 |
Correct |
276 ms |
95456 KB |
Output is correct |
| 50 |
Correct |
188 ms |
55288 KB |
Output is correct |
| 51 |
Correct |
205 ms |
55396 KB |
Output is correct |
| 52 |
Correct |
258 ms |
55496 KB |
Output is correct |
| 53 |
Correct |
272 ms |
60544 KB |
Output is correct |
| 54 |
Correct |
307 ms |
92756 KB |
Output is correct |
| 55 |
Correct |
18 ms |
24412 KB |
Output is correct |
| 56 |
Correct |
10 ms |
22876 KB |
Output is correct |
| 57 |
Correct |
62 ms |
42064 KB |
Output is correct |
| 58 |
Correct |
43 ms |
35432 KB |
Output is correct |
| 59 |
Correct |
104 ms |
60280 KB |
Output is correct |
| 60 |
Correct |
280 ms |
96024 KB |
Output is correct |
| 61 |
Correct |
211 ms |
58068 KB |
Output is correct |
| 62 |
Correct |
161 ms |
55380 KB |
Output is correct |
| 63 |
Correct |
248 ms |
55380 KB |
Output is correct |
| 64 |
Correct |
407 ms |
108560 KB |
Output is correct |
| 65 |
Correct |
415 ms |
108756 KB |
Output is correct |
| 66 |
Correct |
294 ms |
89260 KB |
Output is correct |
| 67 |
Correct |
189 ms |
49916 KB |
Output is correct |
| 68 |
Correct |
337 ms |
71356 KB |
Output is correct |
| 69 |
Correct |
362 ms |
73824 KB |
Output is correct |
| 70 |
Correct |
333 ms |
69752 KB |
Output is correct |
