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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 |
---|---|---|---|---|---|---|---|---|---|
#198301 | #7103. Red Black Tree | Flamire | WA | 0ms | 12112kb | C++14 | 2.4kb | 2023-10-03 12:35:25 | 2023-10-03 12:35:25 |
Judging History
answer
#include <bits/stdc++.h>
#define N 100011
#define ll long long
using namespace std;
int n,m,q,fa[N][21],dfn[N],siz[N],dep[N],clk,rn[N],rred[N],k[N];bool red[N];ll wdep[N],w[N];
struct edge{int v,w,next;edge(){}edge(int _v,int _w,int _next){v=_v;w=_w;next=_next;}}e[N*2];int head[N],sz;
void init(){memset(head,-1,sizeof(head));sz=0;}void insert(int u,int v,int w){e[++sz]=edge(v,w,head[u]);head[u]=sz;}
void dfs0(int u,int f)
{
fa[u][0]=f;for(int i=1;i<=20;++i)fa[u][i]=fa[fa[u][i-1]][i-1];
for(int i=head[u];~i;i=e[i].next)if(e[i].v^f)dep[e[i].v]=dep[u]+1,wdep[e[i].v]=wdep[u]+e[i].w,dfs0(e[i].v,u);
}
void dfs(int u,int f,int rt)
{
dfn[u]=++clk;siz[u]=1;rred[u]=rt;
for(int i=head[u];~i;i=e[i].next)if(!red[e[i].v]&&e[i].v^f)dfs(e[i].v,u,rt),siz[u]+=siz[e[i].v];
}
struct sgt
{
ll mx[N*4];
void pushup(int x){mx[x]=max(mx[x<<1],mx[x<<1|1]);}
void add(int k,ll p,int L=1,int R=n,int x=1)
{
if(L==R){mx[x]=p;return;}
if(k<=L+R>>1)add(k,p,L,L+R>>1,x<<1);else add(k,p,(L+R>>1)+1,R,x<<1|1);pushup(x);
}
ll query(int l,int r,int L=1,int R=n,int x=1)
{
if(l>r)return 0;
if(l<=L&&R<=r)return mx[x];ll ans=0;
if(l<=L+R>>1)ans=max(ans,query(l,r,L,L+R>>1,x<<1));if(r>L+R>>1)ans=max(ans,query(l,r,(L+R>>1)+1,R,x<<1|1));return ans;
}
}sgt1,sgt2;
pair<ll,ll> solve(int y)
{
ll res1=sgt1.query(dfn[y],dfn[y]+siz[y]-1)-wdep[y];
ll res2=max(sgt2.query(1,dfn[y]-1),sgt2.query(dfn[y]+siz[y],n));
return make_pair(res1,res2);
}
int main()
{
scanf("%d%d%d",&n,&m,&q);init();
for(int i=1;i<=m;++i){int x;scanf("%d",&x);red[x]=1;rn[++rn[0]]=x;}
for(int i=1;i<n;++i){int u,v,w;scanf("%d%d%d",&u,&v,&w);insert(u,v,w);insert(v,u,w);}
dfs0(1,0);
for(int i=1;i<=m;++i)dfs(rn[i],fa[rn[i]][0],rn[i]);
for(int i=1;i<=n;++i)w[i]=wdep[i]-wdep[rred[i]];
while(q--)
{
int kn;scanf("%d",&kn);
for(int i=1;i<=kn;++i)scanf("%d",k+i),sgt1.add(dfn[k[i]],wdep[k[i]]),sgt2.add(dfn[k[i]],w[k[i]]);
int id=0;w[0]=-1e9;
for(int i=1;i<=kn;++i)if(w[k[i]]>w[id])id=k[i];
ll ans=1e18;
int cur=id;
for(int i=20;~i;--i)if(dep[cur]-(1<<i)>dep[rred[id]])
{
int y=fa[cur][i];
auto tmp=solve(y);
if(tmp.first<=tmp.second)cur=y;
}
auto tmp=solve(cur);
ans=min(ans,max(tmp.first,tmp.second));
tmp=solve(fa[cur][0]);
ans=min(ans,max(tmp.first,tmp.second));
printf("%lld\n",ans);
for(int i=1;i<=kn;++i)sgt1.add(dfn[k[i]],0),sgt2.add(dfn[k[i]],0);
}return 0;
}
詳細信息
Test #1:
score: 0
Wrong Answer
time: 0ms
memory: 12112kb
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:
0 0
result:
wrong answer 1st lines differ - expected: '4', found: '0'