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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#162841 | #7103. Red Black Tree | ucup-team198 | AC ✓ | 1148ms | 42596kb | C++23 | 2.5kb | 2023-09-03 17:07:40 | 2023-09-03 17:07:41 |
Judging History
answer
#include <algorithm>
#include <array>
#include <cassert>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <tuple>
#include <vector>
using namespace std;
#define endl '\n'
using LL=long long;
constexpr int N=1e5+10,M=__lg(N);
int fa[N][M+1],dep[N];
LL cost[N],dis[N][M+1];
vector<pair<int,LL>> adj[N];
void lca_init(int u,int p) {
dep[u]=dep[p]+1;
for(auto [v,w]:adj[u]) {
if(v==p) continue;
fa[v][0]=u;
dis[v][0]=w;
for(int i=1;i<=M;i++) {
fa[v][i]=fa[fa[v][i-1]][i-1];
dis[v][i]=dis[fa[v][i-1]][i-1]+dis[v][i-1];
}
lca_init(v,u);
}
}
int lca(int u,int v) {
if(dep[u]<dep[v]) swap(u,v);
for(int k=M;~k;k--)
if(dep[fa[u][k]]>=dep[v])
u=fa[u][k];
if(u==v) return u;
for(int k=M;~k;k--)
if(fa[u][k]!=fa[v][k])
u=fa[u][k],v=fa[v][k];
return fa[u][0];
}
LL get_len(int u,int p) {
LL res=0;
if(dep[u]<dep[p]) swap(u,p);
for(int k=M;~k;k--)
if(dep[fa[u][k]]>=dep[p])
res+=dis[u][k],u=fa[u][k];
return res;
}
bool red[N];
void init_cost(int u,int fa,LL up) {
if(red[u]) up=0;
cost[u]=up;
for(auto [v,w]:adj[u]) {
if(v!=fa) {
init_cost(v, u, up+w);
}
}
}
void solve() {
int n,m,q;
cin>>n>>m>>q;
for(int i=1;i<=n;i++) adj[i].clear();
memset(red, 0, sizeof(bool)*(n+1));
for(int i=1,in;i<=m;i++) cin>>in,red[in]=1;
for(int i=1;i<n;i++) {
int u,v,w;
cin>>u>>v>>w;
adj[u].emplace_back(v,w);
adj[v].emplace_back(u,w);
}
init_cost(1, 0, 0);
lca_init(1, 0);
while(q--) {
int k;
cin>>k;
vector<pair<LL,int>> key(k);
for(auto &[cos,u]:key) cin>>u,cos=cost[u];
sort(key.begin(),key.end(),greater<>());
key.emplace_back(0,0);
auto [ans,p]=key.front();
LL max_len=0;
for(int i=0;i<k;i++) {
int u=key[i].second;
int lc=lca(p,u);
max_len=max(max_len+get_len(p, lc),get_len(u, lc));
ans=min(ans,max(max_len,key[i+1].first));
p=lc;
}
cout<<ans<<endl;
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin>>t;
while(t--) solve();
return 0;
}
这程序好像有点Bug,我给组数据试试?
Details
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Test #1:
score: 100
Accepted
time: 2ms
memory: 12044kb
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: 1148ms
memory: 42596kb
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