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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#156724 | #7103. Red Black Tree | ucup-team1321# | AC ✓ | 1510ms | 25528kb | C++23 | 2.5kb | 2023-09-02 14:07:36 | 2023-09-02 14:52:10 |
Judging History
answer
#include<iostream>
#include<cstdio>
#include<vector>
using namespace std;
const int N=100005;
int n,m,q;
int r[N];
int c[N];
vector<pair<int,int>>G[N];
long long dis[N];
int pre[N];
int mi[20][N];
int dfn[N],Index;
int lg2[N];
void init(int n=100000)
{
lg2[0]=-1;
for(int i=1;i<=n;i++)
lg2[i]=lg2[i/2]+1;
return;
}
int dmin(int x,int y){return dfn[x]<dfn[y]?x:y;}
void dfs(int u,int father)
{
if(c[u]) pre[u]=u;
else pre[u]=pre[father];
dfn[u]=++Index;
mi[0][dfn[u]]=father;
for(auto [v,w]:G[u])
{
if(v==father) continue;
dis[v]=dis[u]+w;
dfs(v,u);
}
return;
}
int lca(int u,int v)
{
if(u==v) return u;
u=dfn[u],v=dfn[v];
if(u>v) swap(u,v);
int d=lg2[v-u];
return dmin(mi[d][u+1],mi[d][v-(1<<d)+1]);
}
int p[N],k;
void solve()
{
scanf("%d%d%d",&n,&m,&q);
for(int i=1;i<=m;i++)
scanf("%d",&r[i]);
for(int i=1;i<=n;i++)
G[i].clear();
long long sum=0;
for(int i=1;i<n;i++)
{
int x,y,z;
scanf("%d%d%d",&x,&y,&z);
G[x].emplace_back(y,z);
G[y].emplace_back(x,z);
sum+=z;
}
for(int i=1;i<=n;i++)
c[i]=0;
for(int i=1;i<=m;i++)
c[r[i]]=1;
dis[1]=0;
Index=0;
dfs(1,0);
for(int i=1;(1<<i)<=n;i++)
for(int j=1;j+(1<<i)-1<=n;j++)
mi[i][j]=dmin(mi[i-1][j],mi[i-1][j+(1<<(i-1))]);
while(q--)
{
scanf("%d",&k);
for(int i=1;i<=k;i++)
scanf("%d",&p[i]);
auto check=[=](long long x)
{
vector<int>pos;
for(int i=1;i<=k;i++)
if(dis[p[i]]-dis[pre[p[i]]]>x) pos.emplace_back(p[i]);
if(pos.empty()) return true;
int l=pos[0];
for(int i=1;i<(int)pos.size();i++)
l=lca(l,pos[i]);
for(int u:pos)
if(dis[u]-dis[l]>x) return false;
return true;
};
long long l=0,r=sum,ans=0;
while(l<=r)
{
long long mid=(l+r)/2;
if(check(mid)) ans=mid,r=mid-1;
else l=mid+1;
}
printf("%lld\n",ans);
}
return;
}
int main()
{
init();
int T;
scanf("%d",&T);
while(T--)
solve();
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
*/
这程序好像有点Bug,我给组数据试试?
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 2ms
memory: 10328kb
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: 0
Accepted
time: 1510ms
memory: 25528kb
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 0 319801028 319801028 255904892 317070839 1265145897 1265145897 1072765445 667742619 455103436 285643094 285643094 285643094 317919339 0 785245841 691421476 605409472 479058444 371688030 303203698 493383271 919185207 910180170 919185207 121535083 181713164 181713164 181713164 181...
result:
ok 577632 lines
Extra Test:
score: 0
Extra Test Passed