| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 948267 | Lib | Race (IOI11_race) | C++14 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
//#include "race.h"
using namespace std;
vector <vector <pair <int,int> > > adj;
vector <pair <int,int> > TVector;
int SubtreeSize[300003];
int CurParent[300003];
int IteratedAdj[300003];
int Deleted[300003];
int Visited[300003];
int DistFromRoot[300003];
vector <int> CurRoots;
vector <int> Centroids;
long long ans=999999;
int N,Tar;
int cur;
void DFS(){
vector <int> DFStack;
CurRoots.clear();
for(int i=0;i<=N;i++){
CurParent[i]=-1;
IteratedAdj[i]=0;
SubtreeSize[i]=1;
DistFromRoot[i]=0;
}
for(int i=0;i<N;i++){
if(!Deleted[i]&&!Visited[i]){
DFStack.push_back(i);
CurRoots.push_back(i);
Visited[i]=1;
while(!DFStack.empty()){
cur=DFStack.back();
//cout<<cur<<" ";
Visited[cur]=1;
if(adj[cur][IteratedAdj[cur]].first==CurParent[cur]){
IteratedAdj[cur]++;
}
if(IteratedAdj[cur]<adj[cur].size()-1){ //still has children
DFStack.push_back(adj[cur][IteratedAdj[cur]].first);
CurParent[adj[cur][IteratedAdj[cur]].first]=cur;
DistFromRoot[adj[cur][IteratedAdj[cur]].first]=DistFromRoot[cur]+adj[cur][IteratedAdj[cur]].second;
IteratedAdj[cur]++;
}else{ //no more children. Remove from DFStack
SubtreeSize[CurParent[cur]]+=SubtreeSize[cur];
DFStack.pop_back();
}
}
}
}
for(int i=0;i<CurRoots.size();i++){
pr:;
//cout<<"9";
for(int k=0;k<adj[CurRoots[i]].size();k++){
if(SubtreeSize[adj[CurRoots[i]][k].first]>SubtreeSize[CurRoots[i]]/2){
CurRoots[i]=adj[CurRoots[i]][k].first;
goto pr;
}
}
}
}
void Solve(){
}
int main(){
cin>>N>>Tar;
int s,e,w;
for(int i=0;i<=N+1;i++){
adj.push_back(TVector);
Visited[i]=0;
}
for(int i=1;i<N;i++){
cin>>s>>e>>w;
adj[s].push_back({e,w});
adj[e].push_back({s,w});
}
DFS();
cout<<CurRoots[0];
}
int best_path(int n, int k, int H[][2], int L[]){
N=n;
Tar=k;
for(int i=0;i<=N+1;i++){
adj.push_back(TVector);
}
for(int i=1;i<=N-1;i++){
adj[H[i-1][0]].push_back({H[i-1][1],L[i-1]});
adj[H[i-1][1]].push_back({H[i-1][0],L[i-1]});
}
for(int i=0;i<=N;i++){
Deleted[i]=0;
}
Solve;
if(ans==999999){
return -1;
}else{
return ans;
}
}
/*
7 100
0 1 1
0 2 1
2 3 1
2 4 1
3 5 1
2 6 1
*/