#include<bits/stdc++.h>
using namespace std;
const int inf=1e9;
vector<pair<int,int>>g[200005];
int dp[200005][4];
void dfs(int nod,int t)
{
dp[nod][0]=dp[nod][1]=0;
dp[nod][2]=dp[nod][3]=-inf;
for(auto it:g[nod]){
if (it.first!=t){
dfs(it.first,nod);
int a,b,c,d;
a=max(dp[nod][0]+max(dp[it.first][1],dp[it.first][2]+it.second),dp[nod][1]+dp[it.first][3]+it.second);
a=max(a,max(dp[nod][2]+max(dp[it.first][0],dp[it.first][1]),dp[nod][3]+dp[it.first][1])+it.second);
a=max(a,dp[nod][1]+max(dp[it.first][0],dp[it.first][1]));
b=dp[nod][1]+max(dp[it.first][1],dp[it.first][2]+it.second);
c=max(dp[nod][2]+max(dp[it.first][2]+it.second,dp[it.first][1]),dp[nod][1]+dp[it.first][1]+it.second);
d=max(dp[nod][3]+max(dp[it.first][2]+it.second,dp[it.first][1]),dp[nod][1]+max(dp[it.first][0],dp[it.first][1])+it.second);
dp[nod][0]=a;
dp[nod][1]=b;
dp[nod][2]=c;
dp[nod][3]=d;
}
}
}
int main()
{
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
int n,i,a,b,c;
scanf("%d",&n);
for(i=1;i<n;i++){
scanf("%d%d%d",&a,&b,&c);
g[a].push_back({b,c});
g[b].push_back({a,c});
}
dfs(1,0);
printf("%d\n",max(dp[1][0],dp[1][1]));
return 0;
}
Compilation message
beads.cpp: In function 'int main()':
beads.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
32 | scanf("%d",&n);
| ~~~~~^~~~~~~~~
beads.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
34 | scanf("%d%d%d",&a,&b,&c);
| ~~~~~^~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
5120 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
4 ms |
4972 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
5120 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 23 |
Correct |
6 ms |
5356 KB |
Output is correct |
| 24 |
Correct |
5 ms |
5356 KB |
Output is correct |
| 25 |
Correct |
5 ms |
5356 KB |
Output is correct |
| 26 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 27 |
Correct |
12 ms |
5888 KB |
Output is correct |
| 28 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 29 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 30 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 31 |
Correct |
8 ms |
5996 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
5120 KB |
Output is correct |
| 18 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 23 |
Correct |
6 ms |
5356 KB |
Output is correct |
| 24 |
Correct |
5 ms |
5356 KB |
Output is correct |
| 25 |
Correct |
5 ms |
5356 KB |
Output is correct |
| 26 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 27 |
Correct |
12 ms |
5888 KB |
Output is correct |
| 28 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 29 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 30 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 31 |
Correct |
8 ms |
5996 KB |
Output is correct |
| 32 |
Correct |
30 ms |
8428 KB |
Output is correct |
| 33 |
Correct |
33 ms |
8428 KB |
Output is correct |
| 34 |
Correct |
32 ms |
8428 KB |
Output is correct |
| 35 |
Correct |
228 ms |
19180 KB |
Output is correct |
| 36 |
Correct |
191 ms |
19184 KB |
Output is correct |
| 37 |
Correct |
194 ms |
19180 KB |
Output is correct |
| 38 |
Correct |
129 ms |
19548 KB |
Output is correct |
| 39 |
Correct |
137 ms |
19520 KB |
Output is correct |
| 40 |
Correct |
141 ms |
19412 KB |
Output is correct |
| 41 |
Correct |
166 ms |
23172 KB |
Output is correct |
