#include <bits/stdc++.h>
#define fi first
#define se second
#define lo long long
#define inf 1000000000
#define md 1000000007
#define li 200005
#define mp make_pair
#define pb push_back
using namespace std;
int n,k,vis[li],sub[li],mark[li],ans=inf,G[15][2],T[15];
vector< pair<int,int> > v[li],vec;
vector<int> sil;
int calc(int node,int ata=-1){
sub[node]=0;
for(int i=0;i<(int)v[node].size();i++){
int go=v[node][i].fi;
if(vis[go]==0 && go!=ata) calc(go,node);
}
return ++sub[node];
}
int find(int node,int ata,int sz){
for(int i=0;i<(int)v[node].size();i++){
int go=v[node][i].fi;
if(go!=ata && vis[go]==0 && sub[go]>sz/2){
return find(go,node,sz);
}
}
return node;
}
void dfs(int node,int ata,int val,int st){
if(val==k) ans=min(ans,st);
if(val<k){
ans=min(ans,mark[k-val]+st);
vec.pb(mp(val,st));
}
for(int i=0;i<(int)v[node].size();i++){
int go=v[node][i].fi;
if(go!=ata && vis[go]==0) dfs(go,node,val+v[node][i].se,st+1);
}
}
void solve(int cur=1){
printf("*");
int cen=find(cur,-1,calc(cur));
sil.clear();
for(int i=0;i<(int)v[cen].size();i++){
int go=v[cen][i].fi;
if(vis[go]==1) continue;
vec.clear();
dfs(go,cen,v[cen][i].se,1);
for(int j=0;j<(int)vec.size();j++){
mark[vec[j].fi]=min(mark[vec[j].fi],vec[j].se);
sil.pb(vec[j].fi);
}
}
for(int i=0;i<(int)sil.size();i++){
mark[sil[i]]=inf;
}
vis[cen]=1;
//sil.clear();
for(int i=0;i<(int)v[cen].size();i++){
int git=v[cen][i].fi;
if(vis[git]==0) solve(git);
}
}
int best_path(int N,int K,int H[][2],int L[]){
n=N;
k=K;
for(int i=0;i<n-1;i++){
int u=H[i][0]+1;
int vv=H[i][1]+1;
int c=L[i];
v[u].pb(mp(vv,c));
v[vv].pb(mp(u,c));
}
for(int i=0;i<=k;i++) mark[i]=inf;
solve();
if(ans>=inf) ans=-1;
return ans;
}
//~ int main(){
//~ G[0][0]=0,G[0][1]=1;
//~ G[1][0]=1,G[1][1]=2;
//~ G[2][0]=1,G[2][1]=3;
//~ T[0]=1,T[1]=2,T[2]=4;
//~ int ty=best_path(4,3,G,T);
//~ printf("%d\n",ty);
//~ return 0;
//}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
5112 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
5112 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
5112 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
5112 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
