#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) x.begin(), x.end()
int best_path(int n, int k, int h[][2], int l[]){
vector<vector<array<int, 2>>> adj(n);
for(int i = 0; i < n - 1; ++i){
int u = h[i][0], v = h[i][1], w = l[i];
adj[u].push_back({v, w});
adj[v].push_back({u, w});
}
constexpr int INF = 1e9 + 7;
ll ans = INF;
map<ll, ll> mp[n];
function<void(int, int, ll, ll)> dfs = [&](int u, int p, ll dis, ll dep){
mp[u][dis] = dep;
for(auto &[v, w] : adj[u]){
if(v == p) continue;
dfs(v, u, dis + w, dep + 1);
if(mp[u].size() < mp[v].size()){
swap(mp[u], mp[v]);
}
for(auto &[ndis, ndep] : mp[v]){
ll target = k + 2 * dis - ndis;
if(mp[u].count(target))
ans = min(ans, mp[u][target] + ndep - 2 * dep);
}
for(auto &[ndis, ndep] : mp[v]){
if(!mp[u].count(ndis)){
mp[u][ndis] = ndep;
}else{
mp[u][ndis] = min(mp[u][ndis], ndep);
}
}
}
};
dfs(0, -1, 0, 0);
if(ans == INF) ans = -1;
return ans;
}
/*
int main(){
cin.tie(0)->sync_with_stdio(0);
int n, k; cin >> n >> k;
vector<vector<array<int, 2>>> adj(n);
for(int i = 0; i < n - 1; ++i){
int u, v, w; cin >> u >> v >> w;
adj[u].push_back({v, w});
adj[v].push_back({u, w});
}
constexpr int INF = 1e9 + 7;
ll ans = INF;
map<ll, ll> mp[n];
function<void(int, int, ll, ll)> dfs = [&](int u, int p, ll dis, ll dep){
mp[u][dis] = dep;
for(auto &[v, w] : adj[u]){
if(v == p) continue;
dfs(v, u, dis + w, dep + 1);
if(mp[u].size() < mp[v].size()){
swap(mp[u], mp[v]);
}
for(auto &[ndis, ndep] : mp[v]){
ll target = k + 2 * dis - ndis;
if(mp[u].count(target))
ans = min(ans, mp[u][target] + ndep - 2 * dep);
}
for(auto &[ndis, ndep] : mp[v]){
if(!mp[u].count(ndis)){
mp[u][ndis] = ndep;
}else{
mp[u][ndis] = min(mp[u][ndis], ndep);
}
}
}
};
dfs(0, -1, 0, 0);
if(ans == INF) ans = -1;
cout << ans << '\n';
}
*/
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
1 ms |
300 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
1 ms |
332 KB |
Output is correct |
| 12 |
Correct |
1 ms |
332 KB |
Output is correct |
| 13 |
Correct |
1 ms |
332 KB |
Output is correct |
| 14 |
Correct |
1 ms |
332 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
332 KB |
Output is correct |
| 17 |
Correct |
1 ms |
332 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
1 ms |
300 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
1 ms |
332 KB |
Output is correct |
| 12 |
Correct |
1 ms |
332 KB |
Output is correct |
| 13 |
Correct |
1 ms |
332 KB |
Output is correct |
| 14 |
Correct |
1 ms |
332 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
332 KB |
Output is correct |
| 17 |
Correct |
1 ms |
332 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
1 ms |
204 KB |
Output is correct |
| 21 |
Correct |
2 ms |
588 KB |
Output is correct |
| 22 |
Correct |
2 ms |
588 KB |
Output is correct |
| 23 |
Correct |
2 ms |
588 KB |
Output is correct |
| 24 |
Correct |
2 ms |
588 KB |
Output is correct |
| 25 |
Correct |
2 ms |
588 KB |
Output is correct |
| 26 |
Correct |
2 ms |
588 KB |
Output is correct |
| 27 |
Correct |
1 ms |
460 KB |
Output is correct |
| 28 |
Correct |
2 ms |
588 KB |
Output is correct |
| 29 |
Correct |
2 ms |
588 KB |
Output is correct |
| 30 |
Correct |
2 ms |
588 KB |
Output is correct |
| 31 |
Correct |
2 ms |
588 KB |
Output is correct |
| 32 |
Correct |
2 ms |
568 KB |
Output is correct |
| 33 |
Correct |
2 ms |
692 KB |
Output is correct |
| 34 |
Correct |
2 ms |
588 KB |
Output is correct |
| 35 |
Correct |
1 ms |
588 KB |
Output is correct |
| 36 |
Correct |
1 ms |
588 KB |
Output is correct |
| 37 |
Correct |
1 ms |
588 KB |
Output is correct |
| 38 |
Correct |
1 ms |
588 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
1 ms |
300 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
1 ms |
332 KB |
Output is correct |
| 12 |
Correct |
1 ms |
332 KB |
Output is correct |
| 13 |
Correct |
1 ms |
332 KB |
Output is correct |
| 14 |
Correct |
1 ms |
332 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
332 KB |
Output is correct |
| 17 |
Correct |
1 ms |
332 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| 19 |
Correct |
165 ms |
29044 KB |
Output is correct |
| 20 |
Correct |
161 ms |
29168 KB |
Output is correct |
| 21 |
Correct |
158 ms |
28888 KB |
Output is correct |
| 22 |
Correct |
163 ms |
28408 KB |
Output is correct |
| 23 |
Correct |
207 ms |
41284 KB |
Output is correct |
| 24 |
Correct |
165 ms |
31848 KB |
Output is correct |
| 25 |
Correct |
131 ms |
28996 KB |
Output is correct |
| 26 |
Correct |
72 ms |
36368 KB |
Output is correct |
| 27 |
Correct |
232 ms |
46120 KB |
Output is correct |
| 28 |
Correct |
390 ms |
85436 KB |
Output is correct |
| 29 |
Correct |
405 ms |
83864 KB |
Output is correct |
| 30 |
Correct |
242 ms |
46236 KB |
Output is correct |
| 31 |
Correct |
237 ms |
46140 KB |
Output is correct |
| 32 |
Correct |
304 ms |
46368 KB |
Output is correct |
| 33 |
Correct |
314 ms |
51272 KB |
Output is correct |
| 34 |
Correct |
435 ms |
83924 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
1 ms |
300 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
1 ms |
332 KB |
Output is correct |
| 12 |
Correct |
1 ms |
332 KB |
Output is correct |
| 13 |
Correct |
1 ms |
332 KB |
Output is correct |
| 14 |
Correct |
1 ms |
332 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
332 KB |
Output is correct |
| 17 |
Correct |
1 ms |
332 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
1 ms |
204 KB |
Output is correct |
| 21 |
Correct |
2 ms |
588 KB |
Output is correct |
| 22 |
Correct |
2 ms |
588 KB |
Output is correct |
| 23 |
Correct |
2 ms |
588 KB |
Output is correct |
| 24 |
Correct |
2 ms |
588 KB |
Output is correct |
| 25 |
Correct |
2 ms |
588 KB |
Output is correct |
| 26 |
Correct |
2 ms |
588 KB |
Output is correct |
| 27 |
Correct |
1 ms |
460 KB |
Output is correct |
| 28 |
Correct |
2 ms |
588 KB |
Output is correct |
| 29 |
Correct |
2 ms |
588 KB |
Output is correct |
| 30 |
Correct |
2 ms |
588 KB |
Output is correct |
| 31 |
Correct |
2 ms |
588 KB |
Output is correct |
| 32 |
Correct |
2 ms |
568 KB |
Output is correct |
| 33 |
Correct |
2 ms |
692 KB |
Output is correct |
| 34 |
Correct |
2 ms |
588 KB |
Output is correct |
| 35 |
Correct |
1 ms |
588 KB |
Output is correct |
| 36 |
Correct |
1 ms |
588 KB |
Output is correct |
| 37 |
Correct |
1 ms |
588 KB |
Output is correct |
| 38 |
Correct |
1 ms |
588 KB |
Output is correct |
| 39 |
Correct |
165 ms |
29044 KB |
Output is correct |
| 40 |
Correct |
161 ms |
29168 KB |
Output is correct |
| 41 |
Correct |
158 ms |
28888 KB |
Output is correct |
| 42 |
Correct |
163 ms |
28408 KB |
Output is correct |
| 43 |
Correct |
207 ms |
41284 KB |
Output is correct |
| 44 |
Correct |
165 ms |
31848 KB |
Output is correct |
| 45 |
Correct |
131 ms |
28996 KB |
Output is correct |
| 46 |
Correct |
72 ms |
36368 KB |
Output is correct |
| 47 |
Correct |
232 ms |
46120 KB |
Output is correct |
| 48 |
Correct |
390 ms |
85436 KB |
Output is correct |
| 49 |
Correct |
405 ms |
83864 KB |
Output is correct |
| 50 |
Correct |
242 ms |
46236 KB |
Output is correct |
| 51 |
Correct |
237 ms |
46140 KB |
Output is correct |
| 52 |
Correct |
304 ms |
46368 KB |
Output is correct |
| 53 |
Correct |
314 ms |
51272 KB |
Output is correct |
| 54 |
Correct |
435 ms |
83924 KB |
Output is correct |
| 55 |
Correct |
16 ms |
4100 KB |
Output is correct |
| 56 |
Correct |
10 ms |
2764 KB |
Output is correct |
| 57 |
Correct |
99 ms |
26440 KB |
Output is correct |
| 58 |
Correct |
62 ms |
19672 KB |
Output is correct |
| 59 |
Correct |
119 ms |
42732 KB |
Output is correct |
| 60 |
Correct |
386 ms |
84188 KB |
Output is correct |
| 61 |
Correct |
261 ms |
49752 KB |
Output is correct |
| 62 |
Correct |
220 ms |
46276 KB |
Output is correct |
| 63 |
Correct |
292 ms |
46516 KB |
Output is correct |
| 64 |
Correct |
574 ms |
101520 KB |
Output is correct |
| 65 |
Correct |
583 ms |
99620 KB |
Output is correct |
| 66 |
Correct |
401 ms |
80256 KB |
Output is correct |
| 67 |
Correct |
241 ms |
40788 KB |
Output is correct |
| 68 |
Correct |
422 ms |
63000 KB |
Output is correct |
| 69 |
Correct |
432 ms |
68268 KB |
Output is correct |
| 70 |
Correct |
392 ms |
60344 KB |
Output is correct |
