#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 |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
8 ms |
14400 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
8 ms |
14336 KB |
Output is correct |
| 6 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14392 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14444 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14464 KB |
Output is correct |
| 16 |
Correct |
7 ms |
14396 KB |
Output is correct |
| 17 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
7 ms |
14404 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
8 ms |
14400 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
8 ms |
14336 KB |
Output is correct |
| 6 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14392 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14444 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14464 KB |
Output is correct |
| 16 |
Correct |
7 ms |
14396 KB |
Output is correct |
| 17 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
7 ms |
14404 KB |
Output is correct |
| 19 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 20 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 21 |
Correct |
10 ms |
14676 KB |
Output is correct |
| 22 |
Correct |
9 ms |
14768 KB |
Output is correct |
| 23 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 24 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 25 |
Correct |
8 ms |
14724 KB |
Output is correct |
| 26 |
Correct |
9 ms |
14668 KB |
Output is correct |
| 27 |
Correct |
9 ms |
14548 KB |
Output is correct |
| 28 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 29 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 30 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 31 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 32 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 33 |
Correct |
9 ms |
14668 KB |
Output is correct |
| 34 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 35 |
Correct |
8 ms |
14660 KB |
Output is correct |
| 36 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 37 |
Correct |
8 ms |
14668 KB |
Output is correct |
| 38 |
Correct |
9 ms |
14676 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
8 ms |
14400 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
8 ms |
14336 KB |
Output is correct |
| 6 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14392 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14444 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14464 KB |
Output is correct |
| 16 |
Correct |
7 ms |
14396 KB |
Output is correct |
| 17 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
7 ms |
14404 KB |
Output is correct |
| 19 |
Correct |
140 ms |
39188 KB |
Output is correct |
| 20 |
Correct |
133 ms |
39204 KB |
Output is correct |
| 21 |
Correct |
131 ms |
38988 KB |
Output is correct |
| 22 |
Correct |
142 ms |
38412 KB |
Output is correct |
| 23 |
Correct |
171 ms |
51404 KB |
Output is correct |
| 24 |
Correct |
127 ms |
41412 KB |
Output is correct |
| 25 |
Correct |
118 ms |
40012 KB |
Output is correct |
| 26 |
Correct |
82 ms |
48240 KB |
Output is correct |
| 27 |
Correct |
204 ms |
52068 KB |
Output is correct |
| 28 |
Correct |
339 ms |
94092 KB |
Output is correct |
| 29 |
Correct |
316 ms |
92372 KB |
Output is correct |
| 30 |
Correct |
207 ms |
52044 KB |
Output is correct |
| 31 |
Correct |
213 ms |
52148 KB |
Output is correct |
| 32 |
Correct |
324 ms |
52192 KB |
Output is correct |
| 33 |
Correct |
285 ms |
57080 KB |
Output is correct |
| 34 |
Correct |
383 ms |
88988 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
8 ms |
14400 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
8 ms |
14336 KB |
Output is correct |
| 6 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14392 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14444 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14464 KB |
Output is correct |
| 16 |
Correct |
7 ms |
14396 KB |
Output is correct |
| 17 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
7 ms |
14404 KB |
Output is correct |
| 19 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 20 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 21 |
Correct |
10 ms |
14676 KB |
Output is correct |
| 22 |
Correct |
9 ms |
14768 KB |
Output is correct |
| 23 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 24 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 25 |
Correct |
8 ms |
14724 KB |
Output is correct |
| 26 |
Correct |
9 ms |
14668 KB |
Output is correct |
| 27 |
Correct |
9 ms |
14548 KB |
Output is correct |
| 28 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 29 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 30 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 31 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 32 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 33 |
Correct |
9 ms |
14668 KB |
Output is correct |
| 34 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 35 |
Correct |
8 ms |
14660 KB |
Output is correct |
| 36 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 37 |
Correct |
8 ms |
14668 KB |
Output is correct |
| 38 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 39 |
Correct |
140 ms |
39188 KB |
Output is correct |
| 40 |
Correct |
133 ms |
39204 KB |
Output is correct |
| 41 |
Correct |
131 ms |
38988 KB |
Output is correct |
| 42 |
Correct |
142 ms |
38412 KB |
Output is correct |
| 43 |
Correct |
171 ms |
51404 KB |
Output is correct |
| 44 |
Correct |
127 ms |
41412 KB |
Output is correct |
| 45 |
Correct |
118 ms |
40012 KB |
Output is correct |
| 46 |
Correct |
82 ms |
48240 KB |
Output is correct |
| 47 |
Correct |
204 ms |
52068 KB |
Output is correct |
| 48 |
Correct |
339 ms |
94092 KB |
Output is correct |
| 49 |
Correct |
316 ms |
92372 KB |
Output is correct |
| 50 |
Correct |
207 ms |
52044 KB |
Output is correct |
| 51 |
Correct |
213 ms |
52148 KB |
Output is correct |
| 52 |
Correct |
324 ms |
52192 KB |
Output is correct |
| 53 |
Correct |
285 ms |
57080 KB |
Output is correct |
| 54 |
Correct |
383 ms |
88988 KB |
Output is correct |
| 55 |
Correct |
21 ms |
17792 KB |
Output is correct |
| 56 |
Correct |
15 ms |
16468 KB |
Output is correct |
| 57 |
Correct |
76 ms |
36684 KB |
Output is correct |
| 58 |
Correct |
52 ms |
29188 KB |
Output is correct |
| 59 |
Correct |
114 ms |
54468 KB |
Output is correct |
| 60 |
Correct |
323 ms |
92972 KB |
Output is correct |
| 61 |
Correct |
246 ms |
55576 KB |
Output is correct |
| 62 |
Correct |
209 ms |
52172 KB |
Output is correct |
| 63 |
Correct |
299 ms |
52224 KB |
Output is correct |
| 64 |
Correct |
477 ms |
106444 KB |
Output is correct |
| 65 |
Correct |
459 ms |
104196 KB |
Output is correct |
| 66 |
Correct |
349 ms |
88140 KB |
Output is correct |
| 67 |
Correct |
189 ms |
44584 KB |
Output is correct |
| 68 |
Correct |
370 ms |
67816 KB |
Output is correct |
| 69 |
Correct |
397 ms |
72600 KB |
Output is correct |
| 70 |
Correct |
359 ms |
65688 KB |
Output is correct |
