#include<bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
#define all(v) v.begin(), v.end()
#define F first
#define S second
typedef long long ll;
typedef pair<int, int> pii;
const int N=2e5+5;
int n, a[N], b[N], c[N], d[N], py[N];
vector<pii>g[N];
void dfs(const int &v, const int &p=-1){
for(pii u: g[v]){
if(u.F!=p){
py[u.F]=u.S;
dfs(u.F, v);
d[v]+=c[u.F];
}
}
b[v]=c[v]=d[v];
int w=0, x=-2e9, y=-2e9, z=-2e9;
for(pii u: g[v]){
if(u.F!=p){
c[v]=max(c[v], d[v]-c[u.F]+d[u.F]+u.S+py[v]);
b[v]=max(b[v], d[v]-c[u.F]+a[u.F]);
a[v]=max(a[v], d[v]-c[u.F]+b[u.F]+u.S+py[v]);
z=max({z+c[u.F], y+d[u.F]+u.S, x+b[u.F]+u.S});
y=max(y+c[u.F], w+b[u.F]+u.S);
x=max(x+c[u.F], w+d[u.F]+u.S);
w+=c[u.F];
}
}
b[v]=max(b[v], z);
a[v]=max({a[v], b[v], y+py[v]});
}
int main(){
cin>>n;
for(int i=1;i<n;++i){
int u, v, w;
cin>>u>>v>>w;
g[--u].push_back({--v, w});
g[v].push_back({u, w});
}
py[0]=-2e9;
dfs(0);
cout<<a[0]<<'\n';
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
3 ms |
4948 KB |
Output is correct |
3 |
Correct |
3 ms |
4948 KB |
Output is correct |
4 |
Correct |
3 ms |
4924 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
4 ms |
4948 KB |
Output is correct |
9 |
Correct |
3 ms |
4968 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5004 KB |
Output is correct |
12 |
Correct |
3 ms |
5076 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
3 ms |
4948 KB |
Output is correct |
3 |
Correct |
3 ms |
4948 KB |
Output is correct |
4 |
Correct |
3 ms |
4924 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
4 ms |
4948 KB |
Output is correct |
9 |
Correct |
3 ms |
4968 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5004 KB |
Output is correct |
12 |
Correct |
3 ms |
5076 KB |
Output is correct |
13 |
Correct |
3 ms |
5008 KB |
Output is correct |
14 |
Correct |
3 ms |
4948 KB |
Output is correct |
15 |
Correct |
3 ms |
4948 KB |
Output is correct |
16 |
Correct |
3 ms |
4948 KB |
Output is correct |
17 |
Correct |
4 ms |
4948 KB |
Output is correct |
18 |
Correct |
3 ms |
4948 KB |
Output is correct |
19 |
Correct |
3 ms |
5004 KB |
Output is correct |
20 |
Correct |
3 ms |
5036 KB |
Output is correct |
21 |
Correct |
3 ms |
5012 KB |
Output is correct |
22 |
Correct |
3 ms |
4948 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
3 ms |
4948 KB |
Output is correct |
3 |
Correct |
3 ms |
4948 KB |
Output is correct |
4 |
Correct |
3 ms |
4924 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
4 ms |
4948 KB |
Output is correct |
9 |
Correct |
3 ms |
4968 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5004 KB |
Output is correct |
12 |
Correct |
3 ms |
5076 KB |
Output is correct |
13 |
Correct |
3 ms |
5008 KB |
Output is correct |
14 |
Correct |
3 ms |
4948 KB |
Output is correct |
15 |
Correct |
3 ms |
4948 KB |
Output is correct |
16 |
Correct |
3 ms |
4948 KB |
Output is correct |
17 |
Correct |
4 ms |
4948 KB |
Output is correct |
18 |
Correct |
3 ms |
4948 KB |
Output is correct |
19 |
Correct |
3 ms |
5004 KB |
Output is correct |
20 |
Correct |
3 ms |
5036 KB |
Output is correct |
21 |
Correct |
3 ms |
5012 KB |
Output is correct |
22 |
Correct |
3 ms |
4948 KB |
Output is correct |
23 |
Correct |
7 ms |
5376 KB |
Output is correct |
24 |
Correct |
7 ms |
5384 KB |
Output is correct |
25 |
Correct |
7 ms |
5348 KB |
Output is correct |
26 |
Correct |
13 ms |
5660 KB |
Output is correct |
27 |
Correct |
12 ms |
5660 KB |
Output is correct |
28 |
Correct |
11 ms |
5716 KB |
Output is correct |
29 |
Correct |
12 ms |
5656 KB |
Output is correct |
30 |
Correct |
10 ms |
5776 KB |
Output is correct |
31 |
Correct |
12 ms |
6044 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
3 ms |
4948 KB |
Output is correct |
3 |
Correct |
3 ms |
4948 KB |
Output is correct |
4 |
Correct |
3 ms |
4924 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
4 ms |
4948 KB |
Output is correct |
9 |
Correct |
3 ms |
4968 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5004 KB |
Output is correct |
12 |
Correct |
3 ms |
5076 KB |
Output is correct |
13 |
Correct |
3 ms |
5008 KB |
Output is correct |
14 |
Correct |
3 ms |
4948 KB |
Output is correct |
15 |
Correct |
3 ms |
4948 KB |
Output is correct |
16 |
Correct |
3 ms |
4948 KB |
Output is correct |
17 |
Correct |
4 ms |
4948 KB |
Output is correct |
18 |
Correct |
3 ms |
4948 KB |
Output is correct |
19 |
Correct |
3 ms |
5004 KB |
Output is correct |
20 |
Correct |
3 ms |
5036 KB |
Output is correct |
21 |
Correct |
3 ms |
5012 KB |
Output is correct |
22 |
Correct |
3 ms |
4948 KB |
Output is correct |
23 |
Correct |
7 ms |
5376 KB |
Output is correct |
24 |
Correct |
7 ms |
5384 KB |
Output is correct |
25 |
Correct |
7 ms |
5348 KB |
Output is correct |
26 |
Correct |
13 ms |
5660 KB |
Output is correct |
27 |
Correct |
12 ms |
5660 KB |
Output is correct |
28 |
Correct |
11 ms |
5716 KB |
Output is correct |
29 |
Correct |
12 ms |
5656 KB |
Output is correct |
30 |
Correct |
10 ms |
5776 KB |
Output is correct |
31 |
Correct |
12 ms |
6044 KB |
Output is correct |
32 |
Correct |
48 ms |
8552 KB |
Output is correct |
33 |
Correct |
54 ms |
8576 KB |
Output is correct |
34 |
Correct |
47 ms |
8624 KB |
Output is correct |
35 |
Correct |
259 ms |
19788 KB |
Output is correct |
36 |
Correct |
244 ms |
19852 KB |
Output is correct |
37 |
Correct |
247 ms |
19896 KB |
Output is correct |
38 |
Correct |
204 ms |
20320 KB |
Output is correct |
39 |
Correct |
192 ms |
19492 KB |
Output is correct |
40 |
Correct |
206 ms |
20280 KB |
Output is correct |
41 |
Correct |
250 ms |
24448 KB |
Output is correct |