#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define maxn 1010
#define pii pair<int,int>
vector<pii> L[maxn];
int dp[2][2][maxn];
int get(int hat,int need,int vx,int p=-1){
// fprintf(stderr,"%d %d %d\n",need,vx,p);
int &r = dp[hat][need][vx];
if(r+1) return r;
r = 0;
int l = L[vx].size();
if(need == 0){
if(hat) {
int stot= 0;
vector<int> ss;
for(int k=0;k<l;k++){
int to = L[vx][k].first; // fprintf(stderr,"to %d\n",to);
if(to != p)stot += max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][k].second),
ss.pb(max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][k].second));
}
for(int i=0;i<l;i++)for(int j=i+1;j<l;j++){
int A = L[vx][i].first, B = L[vx][j].first;
if(A == p || B == p) continue;
int s = max (L[vx][i].second + L[vx][j].second + get(0,0,A,vx) + get(1,0,B,vx),
L[vx][i].second + L[vx][j].second + get(1,0,A,vx) + get(0,0,B,vx));
/* for(int k=0;k<l;k++){
int to = L[vx][k].first; // fprintf(stderr,"to %d\n",to);
if(to != A && to != B && to != p) s += max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][k].second);
}*/
s += stot - ss[i] - ss[j];
r = max(r,s);
}
}
int no = 0;
for(int spec=0;spec<l;spec++){
no=0;
for(int k=0;k<l;k++){
int to = L[vx][k].first;
int hh = (hat && (spec==k));
if(to != p) no += max(get(hh,0,to,vx), get(hh,1,to,vx) + L[vx][k].second);
}
r = max(r,no);
}
r = max(r,no);
// fprintf(stderr,"dp[%d][%d]=%d\n",need,vx,r);
return r;
}
if(L[vx].size()==1){
r = -1e7;
return r;
}
for(int i=0;i<L[vx].size();i++){
int s = 0;
if(L[vx][i].first == p) continue;
s = L[vx][i].second + get(hat,0,L[vx][i].first,vx);
for(int j=0;j<L[vx].size();j++){
int to = L[vx][j].first;
if(to == p || i == j) continue;
s += max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][j].second);
}
r = max(r,s);
}
return r;
}
int main() {
int n;
scanf("%d",&n);
for(int i=0;i<n-1;i++){
int a,b,c;
scanf("%d%d%d",&a,&b,&c), a--, b--;
L[a].pb(pii(b,c));
L[b].pb(pii(a,c));
}
memset(dp,-1,sizeof(dp));
printf("%d\n",get(1,0,0));
//printf("%d\n",get(0,0,1));
}
Compilation message
beads.cpp: In function 'int get(int, int, int, int)':
beads.cpp:65:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<L[vx].size();i++){
~^~~~~~~~~~~~~
beads.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<L[vx].size();j++){
~^~~~~~~~~~~~~
beads.cpp: In function 'int main()':
beads.cpp:83:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
beads.cpp:86:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d",&a,&b,&c), a--, b--;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
