#include <cstdio>
#include <cstring>
#include <vector>
#include <algorithm>
#include <map>
#define X first
#define Y second
#define PB push_back
using namespace std;
typedef pair < int, int > pii;
typedef long long ll;
const int N = 2e5 + 500;
const ll INF = 1e15;
vector < pii > v[N];
map < pii, ll > dp[3];
int n;
ll f(int x, int fl, int lst){
if(dp[fl][{x, lst}] != 0)
return dp[fl][{x, lst}] - 1;
ll sm = 0, dod = -INF;
for(pii nxt : v[x]){
if(nxt.X == lst) continue;
ll opt = max(f(nxt.X, 0, x), f(nxt.X, 1, x) + (ll)nxt.Y);
sm += opt;
dod = max(dod, f(nxt.X, 2, x) + nxt.Y - opt);
}
return (dp[fl][{x, lst}] = sm + dod * (fl == 1) + 1) - 1;
}
int main(){
scanf("%d", &n);
for(int i = 1;i < n;i++){
int x, y, z; scanf("%d%d%d", &x, &y, &z);
v[x].PB({y, z}), v[y].PB({x, z});
}
ll sol = 0;
for(int i = 1;i <= n;i++)
sol = max(sol, f(i, 0, i));
printf("%lld\n", sol);
return 0;
}
Compilation message
beads.cpp: In function 'int main()':
beads.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
~~~~~^~~~~~~~~~
beads.cpp:41:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int x, y, z; scanf("%d%d%d", &x, &y, &z);
~~~~~^~~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
4992 KB |
Output is correct |
2 |
Correct |
3 ms |
4992 KB |
Output is correct |
3 |
Correct |
3 ms |
4992 KB |
Output is correct |
4 |
Correct |
3 ms |
4992 KB |
Output is correct |
5 |
Correct |
3 ms |
4992 KB |
Output is correct |
6 |
Correct |
3 ms |
4992 KB |
Output is correct |
7 |
Correct |
3 ms |
4992 KB |
Output is correct |
8 |
Correct |
3 ms |
4992 KB |
Output is correct |
9 |
Correct |
3 ms |
4992 KB |
Output is correct |
10 |
Correct |
3 ms |
4992 KB |
Output is correct |
11 |
Correct |
3 ms |
4992 KB |
Output is correct |
12 |
Correct |
3 ms |
4992 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
4992 KB |
Output is correct |
2 |
Correct |
3 ms |
4992 KB |
Output is correct |
3 |
Correct |
3 ms |
4992 KB |
Output is correct |
4 |
Correct |
3 ms |
4992 KB |
Output is correct |
5 |
Correct |
3 ms |
4992 KB |
Output is correct |
6 |
Correct |
3 ms |
4992 KB |
Output is correct |
7 |
Correct |
3 ms |
4992 KB |
Output is correct |
8 |
Correct |
3 ms |
4992 KB |
Output is correct |
9 |
Correct |
3 ms |
4992 KB |
Output is correct |
10 |
Correct |
3 ms |
4992 KB |
Output is correct |
11 |
Correct |
3 ms |
4992 KB |
Output is correct |
12 |
Correct |
3 ms |
4992 KB |
Output is correct |
13 |
Correct |
3 ms |
5120 KB |
Output is correct |
14 |
Correct |
4 ms |
4992 KB |
Output is correct |
15 |
Correct |
4 ms |
5120 KB |
Output is correct |
16 |
Correct |
4 ms |
5120 KB |
Output is correct |
17 |
Correct |
4 ms |
5120 KB |
Output is correct |
18 |
Correct |
4 ms |
5120 KB |
Output is correct |
19 |
Correct |
31 ms |
5248 KB |
Output is correct |
20 |
Correct |
16 ms |
5144 KB |
Output is correct |
21 |
Correct |
18 ms |
5120 KB |
Output is correct |
22 |
Correct |
8 ms |
5120 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
4992 KB |
Output is correct |
2 |
Correct |
3 ms |
4992 KB |
Output is correct |
3 |
Correct |
3 ms |
4992 KB |
Output is correct |
4 |
Correct |
3 ms |
4992 KB |
Output is correct |
5 |
Correct |
3 ms |
4992 KB |
Output is correct |
6 |
Correct |
3 ms |
4992 KB |
Output is correct |
7 |
Correct |
3 ms |
4992 KB |
Output is correct |
8 |
Correct |
3 ms |
4992 KB |
Output is correct |
9 |
Correct |
3 ms |
4992 KB |
Output is correct |
10 |
Correct |
3 ms |
4992 KB |
Output is correct |
11 |
Correct |
3 ms |
4992 KB |
Output is correct |
12 |
Correct |
3 ms |
4992 KB |
Output is correct |
13 |
Correct |
3 ms |
5120 KB |
Output is correct |
14 |
Correct |
4 ms |
4992 KB |
Output is correct |
15 |
Correct |
4 ms |
5120 KB |
Output is correct |
16 |
Correct |
4 ms |
5120 KB |
Output is correct |
17 |
Correct |
4 ms |
5120 KB |
Output is correct |
18 |
Correct |
4 ms |
5120 KB |
Output is correct |
19 |
Correct |
31 ms |
5248 KB |
Output is correct |
20 |
Correct |
16 ms |
5144 KB |
Output is correct |
21 |
Correct |
18 ms |
5120 KB |
Output is correct |
22 |
Correct |
8 ms |
5120 KB |
Output is correct |
23 |
Correct |
52 ms |
7492 KB |
Output is correct |
24 |
Correct |
54 ms |
7416 KB |
Output is correct |
25 |
Correct |
54 ms |
7416 KB |
Output is correct |
26 |
Correct |
120 ms |
9984 KB |
Output is correct |
27 |
Correct |
120 ms |
9848 KB |
Output is correct |
28 |
Execution timed out |
1095 ms |
7544 KB |
Time limit exceeded |
29 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
4992 KB |
Output is correct |
2 |
Correct |
3 ms |
4992 KB |
Output is correct |
3 |
Correct |
3 ms |
4992 KB |
Output is correct |
4 |
Correct |
3 ms |
4992 KB |
Output is correct |
5 |
Correct |
3 ms |
4992 KB |
Output is correct |
6 |
Correct |
3 ms |
4992 KB |
Output is correct |
7 |
Correct |
3 ms |
4992 KB |
Output is correct |
8 |
Correct |
3 ms |
4992 KB |
Output is correct |
9 |
Correct |
3 ms |
4992 KB |
Output is correct |
10 |
Correct |
3 ms |
4992 KB |
Output is correct |
11 |
Correct |
3 ms |
4992 KB |
Output is correct |
12 |
Correct |
3 ms |
4992 KB |
Output is correct |
13 |
Correct |
3 ms |
5120 KB |
Output is correct |
14 |
Correct |
4 ms |
4992 KB |
Output is correct |
15 |
Correct |
4 ms |
5120 KB |
Output is correct |
16 |
Correct |
4 ms |
5120 KB |
Output is correct |
17 |
Correct |
4 ms |
5120 KB |
Output is correct |
18 |
Correct |
4 ms |
5120 KB |
Output is correct |
19 |
Correct |
31 ms |
5248 KB |
Output is correct |
20 |
Correct |
16 ms |
5144 KB |
Output is correct |
21 |
Correct |
18 ms |
5120 KB |
Output is correct |
22 |
Correct |
8 ms |
5120 KB |
Output is correct |
23 |
Correct |
52 ms |
7492 KB |
Output is correct |
24 |
Correct |
54 ms |
7416 KB |
Output is correct |
25 |
Correct |
54 ms |
7416 KB |
Output is correct |
26 |
Correct |
120 ms |
9984 KB |
Output is correct |
27 |
Correct |
120 ms |
9848 KB |
Output is correct |
28 |
Execution timed out |
1095 ms |
7544 KB |
Time limit exceeded |
29 |
Halted |
0 ms |
0 KB |
- |