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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 |
---|---|---|---|---|---|---|---|---|---|
#240802 | #7103. Red Black Tree | ucup-team2307# | AC ✓ | 994ms | 41140kb | C++20 | 3.6kb | 2023-11-05 19:24:25 | 2023-11-05 19:24:25 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
const int N=1e5+100,L=20,INF=1e18;
bool r[N];
vector<pair<int,int>> g[N];
int where[N];
int par[N][L];
int dep[N],sum[N];
int timer,tin[N],tout[N];
void dfs(int v,int p,int wh,int d,int s)
{
if(r[v])
wh=v,
s=0;
where[v]=wh;
dep[v]=d;
sum[v]=s;
par[v][0]=p;
for(int i=1;i<L;i++)
par[v][i]=par[par[v][i-1]][i-1];
timer++;
tin[v]=timer;
for(auto[to,w]:g[v])
if(to!=p)
dfs(to,v,wh,d+1,s+w);
tout[v]=timer;
}
int lca(int u,int v)
{
if(dep[u]>dep[v])
swap(u,v);
for(int i=L-1;i>=0;i--)
if(dep[v]-dep[u]>=(1<<i))
v=par[v][i];
if(u==v)
return u;
for(int i=L-1;i>=0;i--)
if(par[v][i]!=par[u][i])
v=par[v][i],
u=par[u][i];
return par[v][0];
}
struct SegTree {
int n;
vector<int> tree;
SegTree(int N) : n(N), tree(2*n,-INF) {}
void upd(int pos, int val) {
for(tree[pos += n] = val; pos /= 2;)
tree[pos] = max(tree[2 * pos], tree[2 * pos + 1]);
}
int query(int l, int r) {
r++;
int res = 0;
for(l += n, r += n; l < r; l>>=1,r>>=1) {
if(l & 1) res = max(res,tree[l++]);
if(r & 1) res = max(res,tree[--r]);
}
return res;
}
} seg(N);
int solve(vector<int>&vers)
{
// return 123;
sort(vers.begin(),vers.end(),[](int u,int v){return tin[u]<tin[v];});
for(int v:vers) {
seg.upd(tin[v], sum[v]);
}
int ans=seg.query(0,N-1);
auto process=[&](int l)
{
int cur= max({
seg.query(0,tin[l]-1),
seg.query(tin[l],tout[l])-sum[l],
seg.query(tout[l]+1,N-1),
});
ans=min(ans,cur);
};
for(int l:vers)
process(l);
for(int i=0;i+1<vers.size();i++)
{
int l=lca(vers[i],vers[i+1]);
process(l);
}
for(int v:vers)
seg.upd(tin[v],-INF);
return ans;
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
mt19937 rng;
map<int,vector<int>> query;
int T=10;
cin>>T;
while(T--)
{
int n=1e5,m=1,q=2e5;
cin>>n>>m>>q;
for(int i=1;i<=n;i++)
g[i].clear(),
r[i]=false;
for(int i=1;i<=m;i++)
{
int x=1;
cin>>x;
r[x]=true;
}
for(int i=2;i<=n;i++)
{
// int u=rng()%(i-1)+1,v=i,w=rng()%1000000000+1;
int u,v,w;
cin>>u>>v>>w;
g[u].emplace_back(v,w);
g[v].emplace_back(u,w);
}
timer=0;
dfs(1,0,0,0,0);
while(q--)
{
int k=1;
cin>>k;
query.clear();
while(k--)
{
// int x=rng()%n+1;
int x;
cin>>x;
query[where[x]].push_back(x);
}
pair<int,int> first(0,0);
pair<int,int> second(0,0);
for(auto&[red,vec]:query)
{
int mx=0;
for(int v:vec)
mx=max(mx,sum[v]);
pair<int,int> cur(mx,red);
second=max(second,cur);
if(first<second)
swap(first,second);
}
cout<<max(solve(query[first.second]),second.first)<<"\n";
}
}
}
这程序好像有点Bug,我给组数据试试?
详细
Test #1:
score: 100
Accepted
time: 2ms
memory: 9852kb
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: 994ms
memory: 41140kb
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