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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#244999 | #7103. Red Black Tree | Sylvialline | WA | 499ms | 15044kb | C++23 | 2.3kb | 2023-11-09 17:47:18 | 2023-11-09 17:47:20 |
Judging History
answer
#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
using ll=long long;
void solve();
int main(){
cin.tie(nullptr)->ios::sync_with_stdio(false);
cout.tie(nullptr);
int t=1;
cin>>t;
while(t--)solve();
}
const int N=1e5+3,M=2e5+3;
int to[M],nxt[M],val[M],lst[N],tt;
ll cst[N],dis[N];
int dfn[N],nfd[N],ti;
void add(int u,int v,int w){
to[++tt]=v;
val[tt]=w;
nxt[tt]=lst[u];
lst[u]=tt;
}
bool isr[N];
int dep[N],fa[N],sz[N],ch[N];
void dfsp(int u){
dfn[u]=++ti;
if(isr[u])cst[u]=0;
sz[u]=1;
for(int i=lst[u];i;i=nxt[i]){
int v=to[i];
if(v!=fa[u]){
dis[v]=dis[u]+val[i];
cst[v]=cst[u]+val[i];
fa[v]=u;
dep[v]=dep[u]+1;
dfsp(v);
sz[u]+=sz[v];
if(sz[ch[u]]<sz[v])ch[u]=v;
}
}
nfd[u]=ti;
}
int top[N];
void dfsc(int u){
if(!top[u])top[u]=u;
if(ch[u])top[ch[u]]=top[u];
for(int i=lst[u];i;i=nxt[i]){
int v=to[i];
if(v!=fa[u])dfsc(v);
}
}
int glca(int x,int y){
for(;top[x]!=top[y];x=fa[top[x]])if(dep[top[x]]<dep[top[y]])swap(x,y);
return dep[x]<dep[y]?x:y;
}
struct BIT{
int b[N],n;
vector<pair<int,int>>V;
void modify(int l,int r){
V.emplace_back(l,r);
mdf(l,r+1,1);
}
void mdf(int l,int r,int d){
for(;l<r;l+=l&-l)b[l]+=d;
l=min(l,n+1);
for(;r<l;r+=r&-r)b[r]-=d;
}
int query(int x){
int ans=0;
for(;x;x&=x-1)ans+=b[x];
return ans;
}
void clear(){
while(V.size()){
auto [l,r]=V.back();
mdf(l,r+1,-1);
V.pop_back();
}
}
}B;
void clear(int n){
for(int i=1;i<=n;i++)lst[i]=ch[i]=isr[i]=top[i]=0;
ti=tt=0;
}
void solve(){
int n,m,q;
cin>>n>>m>>q;
B.n=n;
clear(n);
for(int i=1;i<=m;i++){
int x;cin>>x;
isr[x]=1;
}
for(int i=1;i<n;i++){
int u,v,w;
cin>>u>>v>>w;
add(u,v,w);add(v,u,w);
}
dfsp(1);dfsc(1);
for(int i=1;i<=q;i++){
int k;cin>>k;
vector<int>V(k);
for(auto &p:V)cin>>p;
if(k==1){
cout<<0<<endl;
continue;
}
sort(V.begin(),V.end(),[](int x,int y){
return cst[x]>cst[y];
});
int lca=V[0];
B.modify(dfn[V[0]],nfd[V[0]]);
ll ans=cst[V[1]];
for(int j=1;j<k;j++){
if(B.query(dfn[V[j]]))break;
B.modify(dfn[V[j]],nfd[V[j]]);
lca=glca(lca,V[j]);
if(j+1==k||dis[V[0]]-dis[lca]>=cst[V[j+1]]){
ans=min(ans,dis[V[0]]-dis[lca]);
break;
}
ans=min(ans,cst[V[j+1]]);
}
B.clear();
cout<<ans<<endl;
}
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 7536kb
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
Wrong Answer
time: 499ms
memory: 15044kb
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:
wrong answer 691st lines differ - expected: '549790714', found: '374667774'