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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#184554 | #7103. Red Black Tree | zxzxzxq | AC ✓ | 530ms | 60428kb | C++14 | 2.9kb | 2023-09-20 21:04:03 | 2023-09-20 21:04:05 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int maxn=200200;
//const int maxn=200;
int n,m,s1ze,rt[maxn],f[21][maxn];
int vis[maxn],T,q,bl[maxn],lg[maxn];
int dis[maxn],tmp[maxn],k,ans,dep[maxn];
int d0[maxn];
struct mmm{
int lca,depth,from;
bool operator <(mmm &b)
{
return depth<b.depth;
}
}tst[maxn];
int getf(int x)
{
if(x==bl[x]) return x;
return bl[x]=getf(bl[x]);
}
void merrr(int x,int y)
{
bl[getf(x)]=bl[getf(y)];
return ;
}
struct graph{
int head[maxn];
struct edge{
int next,to,dis;
}e[maxn*2];
void addedge(int next,int to,int dis)
{
e[++s1ze].to=to;
e[s1ze].next=head[next];
e[s1ze].dis=dis;
head[next]=s1ze;
}
}G;
void init()
{
// memset(f,0,sizeof(f));
for(int i=1;i<=n;i++)
{
bl[i]=i;
vis[i]=0;
dis[i]=0;
dep[i]=0;
rt[i]=0;
s1ze=0;
G.head[i]=0;
}
for(int i=1;i<=n;i++)
for(int j=0;j<=20;j++)
f[j][i]=0;
for(int i=1;i<=n*2;i++)
G.e[i].next=0;
}
void dfs(int t,int fat)
{
dep[t]=dep[fat]+1;
vis[t]=1;
// f[0][t]=fat;
for(int i=1;i<=20;i++)
f[i][t]=f[i-1][f[i-1][t]];
for(int i=G.head[t];i;i=G.e[i].next)
{
int j=G.e[i].to;
if(rt[j]&&j!=fat&&!vis[j])
{
dfs(j,j);
continue;
}
if(j==fat) continue;
if(vis[j]) continue;
merrr(t,j);
dis[j]=dis[t]+G.e[i].dis;
f[0][j]=t;
dfs(j,t);
}
}
int lca(int x,int y)
{
if(dep[x]<dep[y]) swap(x,y);
int tot=0;
while(dep[x]>dep[y])
{
// tot++;
x=f[lg[dep[x]-dep[y]]][x];
// if(tot==30) break;
}
if(x==y) return x;
for(int i=lg[dep[x]];i>=0;i--)
{
if(f[i][x]==f[i][y]) continue;
x=f[i][x],y=f[i][y];
}
return f[0][x];
}
void check(int x)
{
int cnt=0;
int b0ans=0;
for(int i=1;i<=k;i++)
{
int y=tmp[i];
if(getf(x)!=getf(y))
{
b0ans=max(b0ans,dis[y]);
continue;
}
else
{
int lcaa=lca(x,y);
if(rt[lcaa])
{
b0ans=max(b0ans,dis[y]);
continue;
}
tst[++cnt].depth=dep[lcaa];
tst[cnt].lca=lcaa;
tst[cnt].from=y;
}
}
sort(tst+1,tst+cnt+1);
int nowmmxdis=0;
for(int i=1;i<=cnt;i++)
{
ans=min(ans,max(b0ans,max(dis[x]-dis[tst[i].lca],nowmmxdis)));
nowmmxdis=max(nowmmxdis,dis[tst[i].from]);
}
cout<<ans<<"\n";
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>T;
for(int i=2;i<=maxn-1;i++) lg[i]=lg[i>>1]+1;
while(T--)
{
cin>>n>>m>>q;
init();
for(int i=1;i<=n;i++)
{
f[0][i]=0;
rt[i]=0;
}
for(int i=1;i<=m;i++)
{
int tmp;
cin>>tmp;
rt[tmp]=1;
}
for(int i=1;i<n;i++)
{
int t1,t2,t3;
cin>>t1>>t2>>t3;
G.addedge(t1,t2,t3);
G.addedge(t2,t1,t3);
}
dfs(1,1);
for(int i=1;i<=q;i++)
{
ans=0;
cin>>k;
int dmmx=0;
for(int j=1;j<=k;j++)
{
cin>>tmp[j];
if(dis[tmp[j]]>dis[dmmx]) dmmx=tmp[j];
}
ans=dis[dmmx];
check(dmmx);
}
}
}
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: 0ms
memory: 49460kb
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: 530ms
memory: 60428kb
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