#include <bits/stdc++.h>
#include "race.h"
using namespace std;
#define ll long long
#define debug if(0)
const int N = 2e5 + 4;
const int inf = 1e9+7;
vector<pair<int, ll>> V[N];
ll dist[N], depth[N], K;
map<ll, int> M[N]; // map [dist, depth]
ll ans = inf;
void dfs(int v, int p=-1) {
M[v][dist[v]] = depth[v];
for(auto e : V[v]) {
int u = e.first; ll w = e.second;
if(u != p) {
dist[u] = dist[v]+w;
depth[u] = depth[v]+1;
dfs(u, v);
}
}
}
void dfs2(int v, int p=-1) {
for(auto e : V[v]) {
int u = e.first;
if(u == p) continue;
dfs2(u, v);
if((int) M[v].size() < (int) M[u].size()) swap(M[v], M[u]);
for(auto it = M[u].begin(); it != M[u].end(); ++it) {
if(M[v].find((K+2LL*dist[v]-it->first)) != M[v].end()) { ans = min(ans, M[v][(K+2LL*dist[v]-it->first)]+it->second-2*depth[v]); }
}
for(auto it = M[u].begin(); it != M[u].end(); ++it) {
if(M[v].find(it->first) != M[v].end()) M[v][it->first] = min(M[v][it->first], it->second);
else M[v][it->first] = it->second;
}
}
}
int best_path(int n, int k, int h[][2], int l[]) {
for(int i=0; i<(n-1); i++) {
V[h[i][0]].push_back({h[i][1], l[i]});
V[h[i][1]].push_back({h[i][0], l[i]});
}
K = k;
dfs(0);
dfs2(0);
return (ans == inf ? -1 : (int) ans);
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 6 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14424 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14348 KB |
Output is correct |
| 16 |
Correct |
10 ms |
14420 KB |
Output is correct |
| 17 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
9 ms |
14420 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 6 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14424 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14348 KB |
Output is correct |
| 16 |
Correct |
10 ms |
14420 KB |
Output is correct |
| 17 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 19 |
Correct |
7 ms |
14412 KB |
Output is correct |
| 20 |
Correct |
9 ms |
14412 KB |
Output is correct |
| 21 |
Correct |
8 ms |
14680 KB |
Output is correct |
| 22 |
Correct |
8 ms |
14708 KB |
Output is correct |
| 23 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 24 |
Correct |
9 ms |
14688 KB |
Output is correct |
| 25 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 26 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 27 |
Correct |
10 ms |
14548 KB |
Output is correct |
| 28 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 29 |
Correct |
9 ms |
14780 KB |
Output is correct |
| 30 |
Correct |
8 ms |
14680 KB |
Output is correct |
| 31 |
Correct |
8 ms |
14640 KB |
Output is correct |
| 32 |
Correct |
8 ms |
14680 KB |
Output is correct |
| 33 |
Correct |
8 ms |
14740 KB |
Output is correct |
| 34 |
Correct |
8 ms |
14684 KB |
Output is correct |
| 35 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 36 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 37 |
Correct |
8 ms |
14544 KB |
Output is correct |
| 38 |
Correct |
11 ms |
14676 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 6 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14424 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14348 KB |
Output is correct |
| 16 |
Correct |
10 ms |
14420 KB |
Output is correct |
| 17 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 19 |
Correct |
145 ms |
39220 KB |
Output is correct |
| 20 |
Correct |
143 ms |
39232 KB |
Output is correct |
| 21 |
Correct |
130 ms |
38860 KB |
Output is correct |
| 22 |
Correct |
135 ms |
38464 KB |
Output is correct |
| 23 |
Correct |
189 ms |
51424 KB |
Output is correct |
| 24 |
Correct |
134 ms |
41420 KB |
Output is correct |
| 25 |
Correct |
115 ms |
37544 KB |
Output is correct |
| 26 |
Correct |
60 ms |
43480 KB |
Output is correct |
| 27 |
Correct |
207 ms |
52552 KB |
Output is correct |
| 28 |
Correct |
310 ms |
85440 KB |
Output is correct |
| 29 |
Correct |
312 ms |
84416 KB |
Output is correct |
| 30 |
Correct |
212 ms |
52492 KB |
Output is correct |
| 31 |
Correct |
208 ms |
52492 KB |
Output is correct |
| 32 |
Correct |
300 ms |
52676 KB |
Output is correct |
| 33 |
Correct |
280 ms |
57404 KB |
Output is correct |
| 34 |
Correct |
371 ms |
90060 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 2 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 3 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 4 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 5 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 6 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 7 |
Correct |
7 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 9 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 10 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 11 |
Correct |
7 ms |
14420 KB |
Output is correct |
| 12 |
Correct |
8 ms |
14424 KB |
Output is correct |
| 13 |
Correct |
7 ms |
14408 KB |
Output is correct |
| 14 |
Correct |
8 ms |
14420 KB |
Output is correct |
| 15 |
Correct |
7 ms |
14348 KB |
Output is correct |
| 16 |
Correct |
10 ms |
14420 KB |
Output is correct |
| 17 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 18 |
Correct |
9 ms |
14420 KB |
Output is correct |
| 19 |
Correct |
7 ms |
14412 KB |
Output is correct |
| 20 |
Correct |
9 ms |
14412 KB |
Output is correct |
| 21 |
Correct |
8 ms |
14680 KB |
Output is correct |
| 22 |
Correct |
8 ms |
14708 KB |
Output is correct |
| 23 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 24 |
Correct |
9 ms |
14688 KB |
Output is correct |
| 25 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 26 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 27 |
Correct |
10 ms |
14548 KB |
Output is correct |
| 28 |
Correct |
9 ms |
14676 KB |
Output is correct |
| 29 |
Correct |
9 ms |
14780 KB |
Output is correct |
| 30 |
Correct |
8 ms |
14680 KB |
Output is correct |
| 31 |
Correct |
8 ms |
14640 KB |
Output is correct |
| 32 |
Correct |
8 ms |
14680 KB |
Output is correct |
| 33 |
Correct |
8 ms |
14740 KB |
Output is correct |
| 34 |
Correct |
8 ms |
14684 KB |
Output is correct |
| 35 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 36 |
Correct |
8 ms |
14676 KB |
Output is correct |
| 37 |
Correct |
8 ms |
14544 KB |
Output is correct |
| 38 |
Correct |
11 ms |
14676 KB |
Output is correct |
| 39 |
Correct |
145 ms |
39220 KB |
Output is correct |
| 40 |
Correct |
143 ms |
39232 KB |
Output is correct |
| 41 |
Correct |
130 ms |
38860 KB |
Output is correct |
| 42 |
Correct |
135 ms |
38464 KB |
Output is correct |
| 43 |
Correct |
189 ms |
51424 KB |
Output is correct |
| 44 |
Correct |
134 ms |
41420 KB |
Output is correct |
| 45 |
Correct |
115 ms |
37544 KB |
Output is correct |
| 46 |
Correct |
60 ms |
43480 KB |
Output is correct |
| 47 |
Correct |
207 ms |
52552 KB |
Output is correct |
| 48 |
Correct |
310 ms |
85440 KB |
Output is correct |
| 49 |
Correct |
312 ms |
84416 KB |
Output is correct |
| 50 |
Correct |
212 ms |
52492 KB |
Output is correct |
| 51 |
Correct |
208 ms |
52492 KB |
Output is correct |
| 52 |
Correct |
300 ms |
52676 KB |
Output is correct |
| 53 |
Correct |
280 ms |
57404 KB |
Output is correct |
| 54 |
Correct |
371 ms |
90060 KB |
Output is correct |
| 55 |
Correct |
21 ms |
17876 KB |
Output is correct |
| 56 |
Correct |
15 ms |
16480 KB |
Output is correct |
| 57 |
Correct |
81 ms |
36672 KB |
Output is correct |
| 58 |
Correct |
54 ms |
29112 KB |
Output is correct |
| 59 |
Correct |
91 ms |
49744 KB |
Output is correct |
| 60 |
Correct |
321 ms |
84444 KB |
Output is correct |
| 61 |
Correct |
244 ms |
56008 KB |
Output is correct |
| 62 |
Correct |
203 ms |
52596 KB |
Output is correct |
| 63 |
Correct |
280 ms |
52640 KB |
Output is correct |
| 64 |
Correct |
481 ms |
107496 KB |
Output is correct |
| 65 |
Correct |
465 ms |
105320 KB |
Output is correct |
| 66 |
Correct |
329 ms |
81860 KB |
Output is correct |
| 67 |
Correct |
176 ms |
45488 KB |
Output is correct |
| 68 |
Correct |
398 ms |
69032 KB |
Output is correct |
| 69 |
Correct |
414 ms |
73764 KB |
Output is correct |
| 70 |
Correct |
350 ms |
66604 KB |
Output is correct |
