#include<cstdio>
#include<vector>
#include<algorithm>
std::vector<std::pair<int,int> > tr[200001];
int v[200001];
int d1[200001]; // none
int d2[200001]; // I
int d3[200001]; // V
int d4[200001]; // Y
void dfs(int x,int y)
{
int m2,m31,m32,m32_1,m32_2,m4;
int i;
v[x]=1;
m2=m31=m32=m32_1=m32_2=m4=-1e9;
for(i=0;i<tr[x].size();i++)if(!v[tr[x][i].first])
{
dfs(tr[x][i].first,tr[x][i].second);
d1[x]+=std::max(d1[tr[x][i].first],d2[tr[x][i].first]);
d2[x]+=std::max(d1[tr[x][i].first],d2[tr[x][i].first]);
m2=std::max(m2,y+tr[x][i].second+d1[tr[x][i].first]-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
d3[x]+=std::max(d1[tr[x][i].first],d2[tr[x][i].first]);
m31=std::max(m31,std::max(d3[tr[x][i].first],d4[tr[x][i].first])-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
m32=std::max(m32,m32_1+tr[x][i].second+d1[tr[x][i].first]-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
m32=std::max(m32,m32_2+tr[x][i].second+d3[tr[x][i].first]-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
m32_1=std::max(m32_1,tr[x][i].second+d3[tr[x][i].first]-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
m32_2=std::max(m32_2,tr[x][i].second+d1[tr[x][i].first]-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
d4[x]+=std::max(d1[tr[x][i].first],d2[tr[x][i].first]);
m4=std::max(m4,y+tr[x][i].second+d3[tr[x][i].first]-std::max(d1[tr[x][i].first],d2[tr[x][i].first]));
}
d2[x]+=std::max(0,m2);
d3[x]+=std::max(0,std::max(m31,m32));
d4[x]+=std::max(0,m4);
}
int main()
{
int a,b,c;
int i,n;
scanf("%d",&n);
for(i=1;i<n;i++)
{
scanf("%d%d%d",&a,&b,&c);
tr[a].push_back(std::make_pair(b,c));
tr[b].push_back(std::make_pair(a,c));
}
dfs(1,-1e9);
printf("%d",std::max(std::max(d1[1],d2[1]),std::max(d3[1],d4[1])));
}
Compilation message
beads.cpp: In function 'void dfs(int, int)':
beads.cpp:18:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<tr[x].size();i++)if(!v[tr[x][i].first])
~^~~~~~~~~~~~~
beads.cpp: In function 'int main()':
beads.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
beads.cpp:49:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d",&a,&b,&c);
~~~~~^~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
4992 KB |
Output is correct |
2 |
Correct |
6 ms |
4992 KB |
Output is correct |
3 |
Correct |
6 ms |
4992 KB |
Output is correct |
4 |
Correct |
6 ms |
4992 KB |
Output is correct |
5 |
Correct |
6 ms |
4992 KB |
Output is correct |
6 |
Correct |
5 ms |
4992 KB |
Output is correct |
7 |
Correct |
6 ms |
4992 KB |
Output is correct |
8 |
Correct |
5 ms |
4992 KB |
Output is correct |
9 |
Correct |
6 ms |
4992 KB |
Output is correct |
10 |
Correct |
5 ms |
4992 KB |
Output is correct |
11 |
Correct |
6 ms |
4992 KB |
Output is correct |
12 |
Correct |
6 ms |
5032 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
4992 KB |
Output is correct |
2 |
Correct |
6 ms |
4992 KB |
Output is correct |
3 |
Correct |
6 ms |
4992 KB |
Output is correct |
4 |
Correct |
6 ms |
4992 KB |
Output is correct |
5 |
Correct |
6 ms |
4992 KB |
Output is correct |
6 |
Correct |
5 ms |
4992 KB |
Output is correct |
7 |
Correct |
6 ms |
4992 KB |
Output is correct |
8 |
Correct |
5 ms |
4992 KB |
Output is correct |
9 |
Correct |
6 ms |
4992 KB |
Output is correct |
10 |
Correct |
5 ms |
4992 KB |
Output is correct |
11 |
Correct |
6 ms |
4992 KB |
Output is correct |
12 |
Correct |
6 ms |
5032 KB |
Output is correct |
13 |
Correct |
5 ms |
4992 KB |
Output is correct |
14 |
Correct |
6 ms |
4992 KB |
Output is correct |
15 |
Correct |
6 ms |
4992 KB |
Output is correct |
16 |
Correct |
6 ms |
5120 KB |
Output is correct |
17 |
Correct |
5 ms |
4992 KB |
Output is correct |
18 |
Correct |
6 ms |
4992 KB |
Output is correct |
19 |
Correct |
6 ms |
4992 KB |
Output is correct |
20 |
Correct |
5 ms |
4992 KB |
Output is correct |
21 |
Correct |
5 ms |
4992 KB |
Output is correct |
22 |
Correct |
7 ms |
5120 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
4992 KB |
Output is correct |
2 |
Correct |
6 ms |
4992 KB |
Output is correct |
3 |
Correct |
6 ms |
4992 KB |
Output is correct |
4 |
Correct |
6 ms |
4992 KB |
Output is correct |
5 |
Correct |
6 ms |
4992 KB |
Output is correct |
6 |
Correct |
5 ms |
4992 KB |
Output is correct |
7 |
Correct |
6 ms |
4992 KB |
Output is correct |
8 |
Correct |
5 ms |
4992 KB |
Output is correct |
9 |
Correct |
6 ms |
4992 KB |
Output is correct |
10 |
Correct |
5 ms |
4992 KB |
Output is correct |
11 |
Correct |
6 ms |
4992 KB |
Output is correct |
12 |
Correct |
6 ms |
5032 KB |
Output is correct |
13 |
Correct |
5 ms |
4992 KB |
Output is correct |
14 |
Correct |
6 ms |
4992 KB |
Output is correct |
15 |
Correct |
6 ms |
4992 KB |
Output is correct |
16 |
Correct |
6 ms |
5120 KB |
Output is correct |
17 |
Correct |
5 ms |
4992 KB |
Output is correct |
18 |
Correct |
6 ms |
4992 KB |
Output is correct |
19 |
Correct |
6 ms |
4992 KB |
Output is correct |
20 |
Correct |
5 ms |
4992 KB |
Output is correct |
21 |
Correct |
5 ms |
4992 KB |
Output is correct |
22 |
Correct |
7 ms |
5120 KB |
Output is correct |
23 |
Correct |
8 ms |
5376 KB |
Output is correct |
24 |
Correct |
9 ms |
5376 KB |
Output is correct |
25 |
Correct |
8 ms |
5376 KB |
Output is correct |
26 |
Correct |
11 ms |
5760 KB |
Output is correct |
27 |
Correct |
11 ms |
5760 KB |
Output is correct |
28 |
Correct |
10 ms |
5760 KB |
Output is correct |
29 |
Correct |
10 ms |
5760 KB |
Output is correct |
30 |
Correct |
10 ms |
5760 KB |
Output is correct |
31 |
Correct |
11 ms |
6144 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
4992 KB |
Output is correct |
2 |
Correct |
6 ms |
4992 KB |
Output is correct |
3 |
Correct |
6 ms |
4992 KB |
Output is correct |
4 |
Correct |
6 ms |
4992 KB |
Output is correct |
5 |
Correct |
6 ms |
4992 KB |
Output is correct |
6 |
Correct |
5 ms |
4992 KB |
Output is correct |
7 |
Correct |
6 ms |
4992 KB |
Output is correct |
8 |
Correct |
5 ms |
4992 KB |
Output is correct |
9 |
Correct |
6 ms |
4992 KB |
Output is correct |
10 |
Correct |
5 ms |
4992 KB |
Output is correct |
11 |
Correct |
6 ms |
4992 KB |
Output is correct |
12 |
Correct |
6 ms |
5032 KB |
Output is correct |
13 |
Correct |
5 ms |
4992 KB |
Output is correct |
14 |
Correct |
6 ms |
4992 KB |
Output is correct |
15 |
Correct |
6 ms |
4992 KB |
Output is correct |
16 |
Correct |
6 ms |
5120 KB |
Output is correct |
17 |
Correct |
5 ms |
4992 KB |
Output is correct |
18 |
Correct |
6 ms |
4992 KB |
Output is correct |
19 |
Correct |
6 ms |
4992 KB |
Output is correct |
20 |
Correct |
5 ms |
4992 KB |
Output is correct |
21 |
Correct |
5 ms |
4992 KB |
Output is correct |
22 |
Correct |
7 ms |
5120 KB |
Output is correct |
23 |
Correct |
8 ms |
5376 KB |
Output is correct |
24 |
Correct |
9 ms |
5376 KB |
Output is correct |
25 |
Correct |
8 ms |
5376 KB |
Output is correct |
26 |
Correct |
11 ms |
5760 KB |
Output is correct |
27 |
Correct |
11 ms |
5760 KB |
Output is correct |
28 |
Correct |
10 ms |
5760 KB |
Output is correct |
29 |
Correct |
10 ms |
5760 KB |
Output is correct |
30 |
Correct |
10 ms |
5760 KB |
Output is correct |
31 |
Correct |
11 ms |
6144 KB |
Output is correct |
32 |
Correct |
50 ms |
8720 KB |
Output is correct |
33 |
Correct |
40 ms |
8824 KB |
Output is correct |
34 |
Correct |
50 ms |
8696 KB |
Output is correct |
35 |
Correct |
236 ms |
19960 KB |
Output is correct |
36 |
Correct |
244 ms |
19932 KB |
Output is correct |
37 |
Correct |
215 ms |
19964 KB |
Output is correct |
38 |
Correct |
170 ms |
20324 KB |
Output is correct |
39 |
Correct |
157 ms |
19512 KB |
Output is correct |
40 |
Correct |
185 ms |
20400 KB |
Output is correct |
41 |
Correct |
229 ms |
25424 KB |
Output is correct |