#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second
#define int long long
typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
template<typename T, typename U>
ostream & operator << (ostream &out, const pair<T, U> &c) {
out << c.first << ' ' << c.second;
return out;
}
template<typename T>
ostream & operator << (ostream &out, vector<T> &v) {
const int sz = v.size();
for (int i = 0; i < sz; i++) {
if (i) out << ' ';
out << v[i];
}
return out;
}
template<typename T>
istream & operator >> (istream &in, vector<T> &v) {
for (T &x : v) in >> x;
return in;
}
template<typename T>
void mxx(T &a, T b){if(b > a) a = b;}
template<typename T>
void mnn(T &a, T b){if(b < a) a = b;}
const int mxn = 2e5 + 10, inf = 1e18;
int n, f[mxn], g[mxn], ans;
vector<pair<int, int>> adj[mxn];
void dfs1(int to, int fr) {
f[to] = 0;
g[to] = -inf;
int mx1 = -inf;
for(auto it : adj[to]) {
if(it.ff == fr) continue;
int x = it.ff;
dfs1(x, to);
f[to] += max(f[x], g[x] + it.ss);
mxx(mx1, f[x] + it.ss - max(f[x], g[x] + it.ss));
}
mxx(g[to], f[to] + mx1);
}
void go() {
cin >> n;
for(int i = 1; i < n; i++) {
int x, y, c;
cin >> x >> y >> c;
adj[x].eb(y, c);
adj[y].eb(x, c);
}
for(int i = 1; i <= n; i++) {
dfs1(i, 0);
mxx(ans, f[i]);
}
cout << ans << '\n';
}
signed main() {
//#ifndef ONO
//freopen("beads.in", "r", stdin);
//freopen("beads.out", "w", stdout);
//#endif
fast;
int t = 1;
// cin >> t;
while(t--) {
go();
}
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
5028 KB |
Output is correct |
2 |
Correct |
3 ms |
5028 KB |
Output is correct |
3 |
Correct |
3 ms |
5028 KB |
Output is correct |
4 |
Correct |
3 ms |
4948 KB |
Output is correct |
5 |
Correct |
3 ms |
4948 KB |
Output is correct |
6 |
Correct |
3 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
3 ms |
4956 KB |
Output is correct |
9 |
Correct |
3 ms |
4948 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5024 KB |
Output is correct |
12 |
Correct |
4 ms |
5028 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
5028 KB |
Output is correct |
2 |
Correct |
3 ms |
5028 KB |
Output is correct |
3 |
Correct |
3 ms |
5028 KB |
Output is correct |
4 |
Correct |
3 ms |
4948 KB |
Output is correct |
5 |
Correct |
3 ms |
4948 KB |
Output is correct |
6 |
Correct |
3 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
3 ms |
4956 KB |
Output is correct |
9 |
Correct |
3 ms |
4948 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5024 KB |
Output is correct |
12 |
Correct |
4 ms |
5028 KB |
Output is correct |
13 |
Correct |
3 ms |
5024 KB |
Output is correct |
14 |
Correct |
3 ms |
5160 KB |
Output is correct |
15 |
Correct |
3 ms |
5024 KB |
Output is correct |
16 |
Correct |
3 ms |
4948 KB |
Output is correct |
17 |
Correct |
3 ms |
4948 KB |
Output is correct |
18 |
Correct |
4 ms |
4948 KB |
Output is correct |
19 |
Correct |
4 ms |
4948 KB |
Output is correct |
20 |
Correct |
4 ms |
4948 KB |
Output is correct |
21 |
Correct |
3 ms |
5076 KB |
Output is correct |
22 |
Correct |
4 ms |
4948 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
5028 KB |
Output is correct |
2 |
Correct |
3 ms |
5028 KB |
Output is correct |
3 |
Correct |
3 ms |
5028 KB |
Output is correct |
4 |
Correct |
3 ms |
4948 KB |
Output is correct |
5 |
Correct |
3 ms |
4948 KB |
Output is correct |
6 |
Correct |
3 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
3 ms |
4956 KB |
Output is correct |
9 |
Correct |
3 ms |
4948 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5024 KB |
Output is correct |
12 |
Correct |
4 ms |
5028 KB |
Output is correct |
13 |
Correct |
3 ms |
5024 KB |
Output is correct |
14 |
Correct |
3 ms |
5160 KB |
Output is correct |
15 |
Correct |
3 ms |
5024 KB |
Output is correct |
16 |
Correct |
3 ms |
4948 KB |
Output is correct |
17 |
Correct |
3 ms |
4948 KB |
Output is correct |
18 |
Correct |
4 ms |
4948 KB |
Output is correct |
19 |
Correct |
4 ms |
4948 KB |
Output is correct |
20 |
Correct |
4 ms |
4948 KB |
Output is correct |
21 |
Correct |
3 ms |
5076 KB |
Output is correct |
22 |
Correct |
4 ms |
4948 KB |
Output is correct |
23 |
Correct |
574 ms |
5424 KB |
Output is correct |
24 |
Correct |
575 ms |
5332 KB |
Output is correct |
25 |
Correct |
569 ms |
5412 KB |
Output is correct |
26 |
Execution timed out |
1069 ms |
5844 KB |
Time limit exceeded |
27 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
5028 KB |
Output is correct |
2 |
Correct |
3 ms |
5028 KB |
Output is correct |
3 |
Correct |
3 ms |
5028 KB |
Output is correct |
4 |
Correct |
3 ms |
4948 KB |
Output is correct |
5 |
Correct |
3 ms |
4948 KB |
Output is correct |
6 |
Correct |
3 ms |
4948 KB |
Output is correct |
7 |
Correct |
3 ms |
4948 KB |
Output is correct |
8 |
Correct |
3 ms |
4956 KB |
Output is correct |
9 |
Correct |
3 ms |
4948 KB |
Output is correct |
10 |
Correct |
3 ms |
4948 KB |
Output is correct |
11 |
Correct |
3 ms |
5024 KB |
Output is correct |
12 |
Correct |
4 ms |
5028 KB |
Output is correct |
13 |
Correct |
3 ms |
5024 KB |
Output is correct |
14 |
Correct |
3 ms |
5160 KB |
Output is correct |
15 |
Correct |
3 ms |
5024 KB |
Output is correct |
16 |
Correct |
3 ms |
4948 KB |
Output is correct |
17 |
Correct |
3 ms |
4948 KB |
Output is correct |
18 |
Correct |
4 ms |
4948 KB |
Output is correct |
19 |
Correct |
4 ms |
4948 KB |
Output is correct |
20 |
Correct |
4 ms |
4948 KB |
Output is correct |
21 |
Correct |
3 ms |
5076 KB |
Output is correct |
22 |
Correct |
4 ms |
4948 KB |
Output is correct |
23 |
Correct |
574 ms |
5424 KB |
Output is correct |
24 |
Correct |
575 ms |
5332 KB |
Output is correct |
25 |
Correct |
569 ms |
5412 KB |
Output is correct |
26 |
Execution timed out |
1069 ms |
5844 KB |
Time limit exceeded |
27 |
Halted |
0 ms |
0 KB |
- |