#include <bits/stdc++.h>
#define int long long
using namespace std;
int const mxN = 3e5+5;
int dis[mxN], lift[mxN][20], elem[mxN], n, k, reach[mxN];
vector<pair<int,int>> adj[mxN];
bool vis[mxN];
vector<pair<int,pair<int,int>>> v;
int up ( int steps , int e) {
for(int i=0; i<=19; i++)
if(steps&(1<<i)) e = lift[e][i];
return e;
}
int bring ( int i ) {
int l = 0, r = n+1, ans = i;
while(l<=r) {
int mid = (l+r)/2, e = up(mid, i);
if(dis[i]-dis[e]<=k) { ans = e, l = mid+1; }
else r = mid-1;
}
return ans;
}
void dfs ( int i , int p, int m) {
dis[i] = m;
lift[i][0] = p;
for(int j=1; j<20; j++) lift[i][j] = lift[lift[i][j-1]][j-1];
elem[i] = bring(i);
v.push_back({-dis[elem[i]], {elem[i], i}});
for(auto it:adj[i]) {
if(it.first==p) continue;
dfs(it.first,i, m+it.second);
}
}
void do_work ( int i , int p, int d) {
vis[i] = 1;
for(auto it:adj[i]) {
if(it.first==p) continue;
if(d+it.second>k) continue;
int left = k-(d+it.second);
//if(reach[it.first]>=left) continue;
reach[it.first] = left;
do_work(it.first, i, d+it.second);
}
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
cin>>n>>k;
for(int i = 0; i<n-1; i++) {
int x,y,c; cin>>x>>y>>c;
adj[x].push_back({y,c}), adj[y].push_back({x,c});
}
dfs(1,1,0);
vector<int> fin;
sort(v.begin(),v.end());
for(auto it:v) {
if(!vis[it.second.second]) {
vis[it.second.second] = 1;
do_work(it.second.first, 0, 0);
fin.push_back(it.second.first);
}
}
cout<<fin.size()<<'\n';
for(auto it:fin) cout<<it<<' ';
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
506 ms |
95644 KB |
Output is correct |
2 |
Correct |
478 ms |
96176 KB |
Output is correct |
3 |
Correct |
156 ms |
44752 KB |
Output is correct |
4 |
Correct |
463 ms |
92656 KB |
Output is correct |
5 |
Correct |
3 ms |
14684 KB |
Output is correct |
6 |
Correct |
3 ms |
14684 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
14684 KB |
Output is correct |
2 |
Correct |
2 ms |
14684 KB |
Output is correct |
3 |
Correct |
3 ms |
14684 KB |
Output is correct |
4 |
Correct |
3 ms |
14680 KB |
Output is correct |
5 |
Correct |
3 ms |
14684 KB |
Output is correct |
6 |
Correct |
3 ms |
14684 KB |
Output is correct |
7 |
Correct |
3 ms |
14684 KB |
Output is correct |
8 |
Correct |
3 ms |
14684 KB |
Output is correct |
9 |
Correct |
3 ms |
14684 KB |
Output is correct |
10 |
Correct |
3 ms |
14684 KB |
Output is correct |
11 |
Correct |
3 ms |
14684 KB |
Output is correct |
12 |
Correct |
3 ms |
14684 KB |
Output is correct |
13 |
Correct |
3 ms |
14680 KB |
Output is correct |
14 |
Correct |
3 ms |
14684 KB |
Output is correct |
15 |
Correct |
3 ms |
14828 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
14680 KB |
Output is correct |
2 |
Correct |
3 ms |
14680 KB |
Output is correct |
3 |
Correct |
2 ms |
14684 KB |
Output is correct |
4 |
Correct |
3 ms |
14824 KB |
Output is correct |
5 |
Correct |
3 ms |
14684 KB |
Output is correct |
6 |
Correct |
3 ms |
14684 KB |
Output is correct |
7 |
Correct |
3 ms |
14936 KB |
Output is correct |
8 |
Correct |
4 ms |
14684 KB |
Output is correct |
9 |
Correct |
3 ms |
14684 KB |
Output is correct |
10 |
Correct |
3 ms |
14684 KB |
Output is correct |
11 |
Correct |
3 ms |
14680 KB |
Output is correct |
12 |
Correct |
3 ms |
14940 KB |
Output is correct |
13 |
Correct |
3 ms |
14684 KB |
Output is correct |
14 |
Correct |
3 ms |
14684 KB |
Output is correct |
15 |
Correct |
3 ms |
14684 KB |
Output is correct |
16 |
Correct |
9 ms |
14816 KB |
Output is correct |
17 |
Correct |
3 ms |
14684 KB |
Output is correct |
18 |
Correct |
3 ms |
14828 KB |
Output is correct |
19 |
Correct |
3 ms |
14816 KB |
Output is correct |
20 |
Correct |
3 ms |
14684 KB |
Output is correct |
21 |
Correct |
3 ms |
14688 KB |
Output is correct |
22 |
Correct |
3 ms |
14680 KB |
Output is correct |
23 |
Correct |
4 ms |
14780 KB |
Output is correct |
24 |
Correct |
3 ms |
14684 KB |
Output is correct |
25 |
Correct |
3 ms |
14684 KB |
Output is correct |
26 |
Correct |
3 ms |
14684 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
481 ms |
95684 KB |
Output is correct |
2 |
Correct |
251 ms |
58560 KB |
Output is correct |
3 |
Correct |
249 ms |
63832 KB |
Output is correct |
4 |
Correct |
217 ms |
57404 KB |
Output is correct |
5 |
Correct |
3 ms |
14680 KB |
Output is correct |
6 |
Correct |
3 ms |
14680 KB |
Output is correct |
7 |
Execution timed out |
3085 ms |
97140 KB |
Time limit exceeded |
8 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
14936 KB |
Output is correct |
2 |
Correct |
5 ms |
14940 KB |
Output is correct |
3 |
Correct |
4 ms |
14940 KB |
Output is correct |
4 |
Correct |
4 ms |
14940 KB |
Output is correct |
5 |
Correct |
38 ms |
17244 KB |
Output is correct |
6 |
Correct |
36 ms |
17244 KB |
Output is correct |
7 |
Correct |
25 ms |
17244 KB |
Output is correct |
8 |
Correct |
25 ms |
17244 KB |
Output is correct |
9 |
Correct |
20 ms |
17244 KB |
Output is correct |
10 |
Correct |
20 ms |
17240 KB |
Output is correct |
11 |
Correct |
37 ms |
17364 KB |
Output is correct |
12 |
Correct |
4 ms |
14940 KB |
Output is correct |
13 |
Correct |
26 ms |
17496 KB |
Output is correct |
14 |
Correct |
20 ms |
17244 KB |
Output is correct |
15 |
Correct |
5 ms |
17244 KB |
Output is correct |
16 |
Correct |
4 ms |
14940 KB |
Output is correct |
17 |
Correct |
4 ms |
14920 KB |
Output is correct |
18 |
Correct |
5 ms |
17240 KB |
Output is correct |
19 |
Correct |
7 ms |
15064 KB |
Output is correct |
20 |
Correct |
4 ms |
14940 KB |
Output is correct |
21 |
Correct |
5 ms |
17244 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
489 ms |
90092 KB |
Output is correct |
2 |
Correct |
448 ms |
86972 KB |
Output is correct |
3 |
Correct |
509 ms |
91184 KB |
Output is correct |
4 |
Correct |
216 ms |
53272 KB |
Output is correct |
5 |
Execution timed out |
3095 ms |
100788 KB |
Time limit exceeded |
6 |
Halted |
0 ms |
0 KB |
- |