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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#170483 | #7103. Red Black Tree | xianggui# | TL | 0ms | 13920kb | C++20 | 5.9kb | 2023-09-09 15:21:51 | 2023-09-09 15:22:08 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int T;
int n,m,q,k;
int dfn[100010],timee;
int key[100010];
int a[100010<<2],tot,root;
bool red[100010],kk[100010];
vector<pair<int, ll> > ed[100010],eed[100010];
int fa[100010][21],deep[100010];
ll sum[100010][21];
ll cost[100010];
void dfs(int x,int f)
{
dfn[x]=++timee;
for(int i=1;i<=20;i++)
{
fa[x][i]=fa[fa[x][i-1]][i-1];
sum[x][i]=sum[fa[x][i-1]][i-1]+sum[x][i-1];
}
for(auto i:ed[x])
{
int v=i.first;
ll val=i.second;
if(v==f) continue;
deep[v]=deep[x]+1;
fa[v][0]=x;
sum[v][0]=val;
dfs(v, x);
}
}
void dfs1(int x,int f,ll ss)
{
if(red[x]) ss=0;
cost[x]=ss;
for(auto i:ed[x])
{
int v=i.first;
ll val=i.second;
if(v==f) continue;
dfs1(v, x, ss+val);
}
}
int lca(int x,int y)
{
if(deep[x]<deep[y]) swap(x,y);
for(int i=20;i>=0;i--)
{
int xx=fa[x][i];
if(deep[xx]>=deep[y])
{
x=xx;
}
}
if(x==y) return x;
for(int i=20;i>=0;i--)
{
int xx=fa[x][i];
int yy=fa[y][i];
if(xx!=yy)
{
x=xx;
y=yy;
}
}
return fa[x][0];
}
ll getsum(int x,int y)
{
ll res=0;
for(int i=20;i>=0;i--)
{
int xx=fa[x][i];
if(deep[xx]>=deep[y])
{
res+=sum[x][i];
x=xx;
}
}
return res;
}
bool cmp(int x,int y)
{
return dfn[x]<dfn[y];
}
int id;
ll ans;
ll high[100010];
int fff[100010];
bool maxvis[100010];
int sikey[100010];
void DFS(int x)
{
if(x==id) maxvis[x]=1;
if(kk[x]) sikey[x]++;
for(auto i:eed[x])
{
int v=i.first;
ll val=i.second;
fff[v]=x;
DFS(v);
sikey[x]+=sikey[v];
maxvis[x]|=maxvis[v];
high[x]=max(high[x], high[v]+val);
}
}
int lefkey[100010],silef;
void DFS1(int x)
{
for(auto i:eed[x])
{
int v=i.first;
ll val=i.second;
if(maxvis[v])
{
DFS1(v);
if(kk[v]) lefkey[++silef]=v;
break;
}
}
for(auto i:eed[x])
{
int v=i.first;
ll val=i.second;
if(maxvis[v]) continue;
DFS1(v);
if(kk[v]) lefkey[++silef]=v;
}
}
ll backmaxx[100010];
int main()
{
// cin.tie(0);
// ios::sync_with_stdio(false);
// cout.tie(0);
cin>>T;
while(T--)
{
cin>>n>>m>>q;
timee=0;
for(int i=1;i<=n;i++)
{
red[i]=0;
ed[i].clear();
dfn[i]=0;
}
for(int i=1;i<=m;i++)
{
int x;
cin>>x;
red[x]=1;
}
for(int i=1;i<n;i++)
{
int x,y;
ll z;
cin>>x>>y>>z;
ed[x].push_back(make_pair(y, z));
ed[y].push_back(make_pair(x, z));
}
deep[1]=1;
dfs(1,0);
dfs1(1, 0, 0);
while(q--)
{
cin>>k;
// cout<<"cost:\n";
for(int i=1;i<=k;i++)
{
cin>>key[i];
kk[key[i]]=1;
// cout<<cost[key[i]]<<" ";
}
// puts("");
tot=0;
sort(key+1,key+k+1,cmp);
for(int i=1;i<k;i++)
{
int tem=lca(key[i],key[i+1]);
a[++tot]=key[i];
a[++tot]=tem;
}
a[++tot]=key[k];
sort(a+1,a+1+tot,cmp);
tot=unique(a+1,a+1+tot)-(a+1);
// cout<<"vt:\n";
for(int i=1;i<=tot;i++)
{
// cout<<a[i]<<" ";
eed[a[i]].clear();
fff[a[i]]=0;
maxvis[a[i]]=0;
high[a[i]]=0;
sikey[a[i]]=0;
}
// puts("");
// puts("");
root=a[1];
// cout<<"bt:\n";
for(int i=1;i<tot;i++)
{
int tem=lca(a[i],a[i+1]);
ll val=getsum(a[i+1], tem);
// cout<<tem<<" "<<a[i+1]<<endl;
eed[tem].push_back(make_pair(a[i+1], val));
}
id=0;
ans=0;
// cout<<"!\n";
for(int i=1;i<=k;i++)
{
// cout<<key[i]<<" "<<cost[key[i]]<<endl;
if(cost[key[i]]>ans)
{
ans=cost[key[i]];
id=key[i];
}
}
// cout<<id<<endl;
// cout<<ans<<endl;
silef=0;
DFS(root);
DFS1(root);
backmaxx[silef+1]=0;
// for(int i=1;i<=silef;i++)
// {
// cout<<lefkey[i]<<" ";
// }
// puts("");
// puts("");
for(int i=silef;i>=1;i--)
{
backmaxx[i]=max(backmaxx[i+1], cost[lefkey[i]]);
}
while(id!=0)
{
if(!red[id])
{
int nowsi=sikey[id];
ll backmax=backmaxx[nowsi+1];
// cout<<id<<endl;
// cout<<backmax<<" "<<high[id]<<endl;
ans=min(ans, max(backmax, high[id]));
}
id=fff[id];
}
for(int i=1;i<=k;i++) kk[key[i]]=0;
cout<<ans<<'\n';
}
}
return 0;
}
/*
2
12 2 4
1 9
1 2 1
2 3 4
3 4 3
3 5 2
2 6 2
6 7 1
6 8 2
2 9 5
9 10 2
9 11 3
1 12 10
3 3 7 8
4 4 5 7 8
4 7 8 10 11
3 4 5 12
3 2 3
1 2
1 2 1
1 3 1
1 1
2 1 2
3 1 2 3
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 13920kb
input:
2 12 2 4 1 9 1 2 1 2 3 4 3 4 3 3 5 2 2 6 2 6 7 1 6 8 2 2 9 5 9 10 2 9 11 3 1 12 10 3 3 7 8 4 4 5 7 8 4 7 8 10 11 3 4 5 12 3 2 3 1 2 1 2 1 1 3 1 1 1 2 1 2 3 1 2 3
output:
4 5 3 8 0 0 0
result:
ok 7 lines
Test #2:
score: -100
Time Limit Exceeded
input:
522 26 1 3 1 1 4 276455 18 6 49344056 18 25 58172365 19 9 12014251 2 1 15079181 17 1 50011746 8 9 2413085 23 24 23767115 22 2 26151339 26 21 50183935 17 14 16892041 9 26 53389093 1 20 62299200 24 18 56114328 11 2 50160143 6 26 14430542 16 7 32574577 3 16 59227555 3 15 8795685 4 12 5801074 5 20 57457...
output:
148616264 148616264 66903787 319801028 319801028 255904892 317070839 1265145897 1265145897 1072765445 667742619 455103436 285643094 285643094 285643094 317919339 57081624 785245841 691421476 605409472 479058444 371688030 303203698 493383271 919185207 910180170 919185207 121535083 181713164 181713164...