#include "race.h"
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define all(x) ((x).begin(), (x).end())
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = 2e5 + 5;
const int INF = 1e9;
const ll MOD = 1e9 + 7;
int N, sz[MAXN], ans, K;
vector<pii> G[MAXN];
bool del[MAXN];
map<int, int> mp;
int szdfs(int cur, int par) {
sz[cur] = 1;
for(auto i : G[cur]) if(!del[i.fi] && i.fi != par) sz[cur] += szdfs(i.fi, cur);
return sz[cur];
}
int cdfs(int cur, int par, int cap) {
for(auto i : G[cur]) if(!del[i.fi] && i.fi != par && sz[i.fi] > cap) return cdfs(i.fi, cur, cap);
return cur;
}
void dfs(int cur, int par, int dis, int cnt) {
if(dis > K) return;
if(dis == K || mp[K - dis]) ans = min(ans, mp[K - dis] + cnt);
for(auto nxt : G[cur]) if(!del[nxt.fi] && nxt.fi != par) dfs(nxt.fi, cur, dis + nxt.se, cnt+1);
if(mp[dis] == 0) mp[dis] = cnt;
else mp[dis] = min(mp[dis], cnt);
}
void solve(int cur) {
mp.clear();
for(auto nxt : G[cur]) if(!del[nxt.fi]) dfs(nxt.fi, cur, nxt.se, 1);
}
void decompose(int root, int par) {
int cap = szdfs(root, par);
int cen = cdfs(root, par, cap / 2);
del[cen] = 1;
solve(cen);
for(auto i : G[cen]) if(!del[i.fi]) decompose(i.fi, cen);
}
int best_path(int _N, int _K, int H[][2], int L[]) {
N = _N; K = _K;
for(int i=0; i<N-1; i++) {
int a = H[i][0]+1, b = H[i][1]+1, c = L[i];
G[a].push_back(pii(b, c)); G[b].push_back(pii(a, c));
}
ans = 1e9;
decompose(1, 0);
if(ans == 1e9) return -1;
return ans;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 3 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 5 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 6 |
Correct |
6 ms |
4988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 9 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 10 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 11 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 12 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 13 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 14 |
Correct |
6 ms |
5084 KB |
Output is correct |
| 15 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 16 |
Correct |
6 ms |
5012 KB |
Output is correct |
| 17 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 18 |
Correct |
7 ms |
5112 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 3 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 5 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 6 |
Correct |
6 ms |
4988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 9 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 10 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 11 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 12 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 13 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 14 |
Correct |
6 ms |
5084 KB |
Output is correct |
| 15 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 16 |
Correct |
6 ms |
5012 KB |
Output is correct |
| 17 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 18 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 19 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 20 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 21 |
Correct |
8 ms |
5112 KB |
Output is correct |
| 22 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 23 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 24 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 25 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 26 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 27 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 28 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 29 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 30 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 31 |
Correct |
9 ms |
5116 KB |
Output is correct |
| 32 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 33 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 34 |
Correct |
9 ms |
5112 KB |
Output is correct |
| 35 |
Correct |
8 ms |
5112 KB |
Output is correct |
| 36 |
Correct |
10 ms |
5112 KB |
Output is correct |
| 37 |
Correct |
8 ms |
5240 KB |
Output is correct |
| 38 |
Correct |
9 ms |
5112 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 3 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 5 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 6 |
Correct |
6 ms |
4988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 9 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 10 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 11 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 12 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 13 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 14 |
Correct |
6 ms |
5084 KB |
Output is correct |
| 15 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 16 |
Correct |
6 ms |
5012 KB |
Output is correct |
| 17 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 18 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 19 |
Correct |
309 ms |
10960 KB |
Output is correct |
| 20 |
Correct |
285 ms |
11000 KB |
Output is correct |
| 21 |
Correct |
304 ms |
10948 KB |
Output is correct |
| 22 |
Correct |
289 ms |
11000 KB |
Output is correct |
| 23 |
Correct |
148 ms |
11256 KB |
Output is correct |
| 24 |
Correct |
129 ms |
11000 KB |
Output is correct |
| 25 |
Correct |
226 ms |
12924 KB |
Output is correct |
| 26 |
Correct |
143 ms |
15100 KB |
Output is correct |
| 27 |
Correct |
307 ms |
16604 KB |
Output is correct |
| 28 |
Correct |
405 ms |
24440 KB |
Output is correct |
| 29 |
Correct |
424 ms |
23908 KB |
Output is correct |
| 30 |
Correct |
307 ms |
16376 KB |
Output is correct |
| 31 |
Correct |
309 ms |
16376 KB |
Output is correct |
| 32 |
Correct |
365 ms |
16356 KB |
Output is correct |
| 33 |
Correct |
511 ms |
15224 KB |
Output is correct |
| 34 |
Correct |
299 ms |
15344 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 3 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 5 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 6 |
Correct |
6 ms |
4988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 8 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 9 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 10 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 11 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 12 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 13 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 14 |
Correct |
6 ms |
5084 KB |
Output is correct |
| 15 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 16 |
Correct |
6 ms |
5012 KB |
Output is correct |
| 17 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 18 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 19 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 20 |
Correct |
6 ms |
5112 KB |
Output is correct |
| 21 |
Correct |
8 ms |
5112 KB |
Output is correct |
| 22 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 23 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 24 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 25 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 26 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 27 |
Correct |
7 ms |
5112 KB |
Output is correct |
| 28 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 29 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 30 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 31 |
Correct |
9 ms |
5116 KB |
Output is correct |
| 32 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 33 |
Correct |
9 ms |
5240 KB |
Output is correct |
| 34 |
Correct |
9 ms |
5112 KB |
Output is correct |
| 35 |
Correct |
8 ms |
5112 KB |
Output is correct |
| 36 |
Correct |
10 ms |
5112 KB |
Output is correct |
| 37 |
Correct |
8 ms |
5240 KB |
Output is correct |
| 38 |
Correct |
9 ms |
5112 KB |
Output is correct |
| 39 |
Correct |
309 ms |
10960 KB |
Output is correct |
| 40 |
Correct |
285 ms |
11000 KB |
Output is correct |
| 41 |
Correct |
304 ms |
10948 KB |
Output is correct |
| 42 |
Correct |
289 ms |
11000 KB |
Output is correct |
| 43 |
Correct |
148 ms |
11256 KB |
Output is correct |
| 44 |
Correct |
129 ms |
11000 KB |
Output is correct |
| 45 |
Correct |
226 ms |
12924 KB |
Output is correct |
| 46 |
Correct |
143 ms |
15100 KB |
Output is correct |
| 47 |
Correct |
307 ms |
16604 KB |
Output is correct |
| 48 |
Correct |
405 ms |
24440 KB |
Output is correct |
| 49 |
Correct |
424 ms |
23908 KB |
Output is correct |
| 50 |
Correct |
307 ms |
16376 KB |
Output is correct |
| 51 |
Correct |
309 ms |
16376 KB |
Output is correct |
| 52 |
Correct |
365 ms |
16356 KB |
Output is correct |
| 53 |
Correct |
511 ms |
15224 KB |
Output is correct |
| 54 |
Correct |
299 ms |
15344 KB |
Output is correct |
| 55 |
Correct |
36 ms |
5880 KB |
Output is correct |
| 56 |
Incorrect |
27 ms |
5752 KB |
Output isn't correct |
| 57 |
Halted |
0 ms |
0 KB |
- |
