#include <bits/stdc++.h>
#define gibon ios::sync_with_stdio(false); cin.tie(0);
#define fir first
#define sec second
#define pdd pair<double, double>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pmax pair<__int128, __int128>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
typedef long long ll;
using namespace std;
int dx[4]={0, 1, 0, -1}, dy[4]={1, 0, -1 , 0};
const int mxN=300005;
const int mxM=1010;
const int mxK=105;
const int MOD=1000000007;
const ll INF=1000000;
const ll P1=1000000009;
const ll P2=1000000009;
int N;
ll K;
ll station[mxN];
ll town[mxN];
bool Chk[mxN];
vector <pll> v[mxN];
int ans;
void dfs(int now, int pre, ll dis)
{
station[now]=INF;
town[now]=0;
for(pll nxt : v[now]) if(nxt.fir!=pre)
{
dfs(nxt.fir, now, nxt.sec);
station[now]=min(station[now], station[nxt.fir]+nxt.sec);
town[now]=max(town[now], town[nxt.fir]+nxt.sec);
}
if(now==1)
{
if(town[now]>K-station[now])
{
Chk[now]=true;
ans++;
}
return;
}
if(town[now]<=K-station[now]) town[now]=-INF;
if(town[now]+dis>K)
{
Chk[now]=true;
ans++;
station[now]=0;
town[now]=-1;
}
}
int main()
{
gibon
cin >> N >> K;
for(int i=1;i<N;i++)
{
ll a, b, c;
cin >> a >> b >> c;
v[a].emplace_back(b, c);
v[b].emplace_back(a, c);
}
dfs(1, -1, 0);
cout << ans << '\n';
for(int i=1;i<=N;i++)
{
if(Chk[i]) cout << i << " ";
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
265 ms |
30316 KB |
Output is correct |
2 |
Correct |
285 ms |
30268 KB |
Output is correct |
3 |
Correct |
86 ms |
15880 KB |
Output is correct |
4 |
Correct |
286 ms |
29664 KB |
Output is correct |
5 |
Correct |
3 ms |
7372 KB |
Output is correct |
6 |
Correct |
4 ms |
7372 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
7372 KB |
Output is correct |
2 |
Correct |
4 ms |
7372 KB |
Output is correct |
3 |
Correct |
4 ms |
7372 KB |
Output is correct |
4 |
Correct |
4 ms |
7364 KB |
Output is correct |
5 |
Correct |
4 ms |
7328 KB |
Output is correct |
6 |
Correct |
4 ms |
7372 KB |
Output is correct |
7 |
Correct |
4 ms |
7372 KB |
Output is correct |
8 |
Correct |
4 ms |
7256 KB |
Output is correct |
9 |
Correct |
4 ms |
7372 KB |
Output is correct |
10 |
Correct |
4 ms |
7372 KB |
Output is correct |
11 |
Correct |
4 ms |
7344 KB |
Output is correct |
12 |
Correct |
5 ms |
7368 KB |
Output is correct |
13 |
Correct |
4 ms |
7276 KB |
Output is correct |
14 |
Correct |
4 ms |
7244 KB |
Output is correct |
15 |
Correct |
4 ms |
7368 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
4 ms |
7372 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
301 ms |
30468 KB |
Output is correct |
2 |
Incorrect |
124 ms |
20164 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
5 ms |
7500 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
241 ms |
27256 KB |
Integer parameter [name=F] equals to 0, violates the range [1, 288940] |
2 |
Halted |
0 ms |
0 KB |
- |