QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#166712 | #7103. Red Black Tree | zhoujiu | AC ✓ | 1216ms | 33708kb | C++20 | 2.0kb | 2023-09-06 17:07:15 | 2023-09-06 17:07:16 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=1e5+10;
int T,n,m,q;
vector<pair<int,int>> sons[N];
int cost[N],dist[N];
bool vis[N];
int fa[N][19],depth[N];
void bfs(int root)
{
memset(depth,0x3f,sizeof(depth));
depth[0]=0,depth[root]=1;
queue<int> q;
q.push(root);
while(!q.empty())
{
int u=q.front();
q.pop();
for(auto [k,w]: sons[u])
{
if(depth[k]>depth[u]+1)
{
depth[k]=depth[u]+1;
q.push(k);
fa[k][0]=u;
dist[k]=dist[u]+w;
if(vis[k]) cost[k]=0;
else cost[k]=cost[u]+w;
for(int j=1;j<=18;j++)
fa[k][j]=fa[fa[k][j-1]][j-1];
}
}
}
}
int lca(int a,int b)
{
if(depth[a]<depth[b]) swap(a,b);
for(int k=18;k>=0;k--)
{
if(depth[fa[a][k]]>=depth[b])
a=fa[a][k];
}
if(a==b) return a;
for(int k=18;k>=0;k--)
{
if(fa[a][k]!=fa[b][k])//防止越界
{
a=fa[a][k];
b=fa[b][k];
}
}
return fa[a][0];
}
void solve()
{
cin>>n>>m>>q;
for(int i=1;i<=n;i++)
{
sons[i].clear();
vis[i]=0;
}
for(int i=1;i<=m;i++)
{
int x;
cin>>x;
vis[x]=1;
}
for(int i=1;i<n;i++)
{
int a,b,w;
cin>>a>>b>>w;
sons[a].push_back({b,w});
sons[b].push_back({a,w});
}
bfs(1);
while(q--)
{
int t;
cin>>t;
vector<int> a; while(t--){ int x; cin>>x; a.push_back(x); } a.push_back(1);
sort(a.begin(),a.end(),[&](int a,int b){
return cost[a]>cost[b];
});
int ans=cost[a[1]],anc=a[0];
t=dist[a[0]];
for(int i=1;i<a.size()-1;i++)
{
anc=lca(anc,a[i]);
t=max(t,dist[a[i]]);
ans=min(ans,max(cost[a[i+1]],t-dist[anc]));
}
cout<<ans<<'\n';
}
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cin>>T;
while(T--)
solve();
return 0;
}
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: 4ms
memory: 10904kb
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: 1216ms
memory: 33708kb
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