#include "factories.h"
#include<bits/stdc++.h>
using namespace std;
//#include "grader.cpp"
#define ll long long
#define pb push_back
#define X first
#define Y second
vector<pair<ll,ll> > v[500005];
ll n,lv[500005],dis[500005][25],par[500005][25],d[500005];
void dfs(ll u,ll p)
{
for(int i=0;i<v[u].size();i++)
{
ll node=v[u][i].X,cost=v[u][i].Y;
if(node==p)continue;
lv[node]=lv[u]+1;
dis[node][0]=cost;
d[node]=d[u]+cost;
par[node][0]=u;
dfs(node,u);
}
}
ll lca(ll a,ll b)
{
if(lv[a]<lv[b])swap(a,b);
for(int i=19;i>=0;i--)
{
if(lv[par[a][i]]>=lv[b])
{
a=par[a][i];
}
}
if(a==b)return a;
for(int i=19;i>=0;i--)
{
if(par[a][i]!=par[b][i])
{
a=par[a][i],b=par[b][i];
}
}
return par[a][0];
}
ll lca_dis(ll a,ll b)
{
return d[a]+d[b]-2*d[lca(a,b)];
}
ll sz[500005],vis[500005],par_cen[500005],opt[500005][25];
ll dfs_sz(ll u,ll p)
{
sz[u]=1;
for(int i=0;i<v[u].size();i++)
{
ll node=v[u][i].X;
if(node==p||vis[node])continue;
sz[u]+=dfs_sz(node,u);
}
return sz[u];
}
ll find_cen(ll u,ll p,ll size)
{
for(int i=0;i<v[u].size();i++)
{
ll node=v[u][i].X;
if(node==p||vis[node])continue;
if(sz[node]>size/2)return find_cen(node,u,size);
}
return u;
}
void centroid(ll u,ll p)
{
dfs_sz(u,u);
ll cen=find_cen(u,u,sz[u]);
vis[cen]=1;
par_cen[cen]=p;
for(int i=0;i<v[cen].size();i++)
{
ll node=v[cen][i].X;
if(node==p||vis[node])continue;
centroid(node,cen);
}
}
ll mn[500005];
void Init(int N, int A[], int B[], int D[])
{
n=N;
for(int i=0;i<n-1;i++)
{
v[A[i]+1].pb({B[i]+1,D[i]});
v[B[i]+1].pb({A[i]+1,D[i]});
}
par[1][0]=1;
dfs(1,1);
for(int i=1;i<=19;i++)
{
for(int j=1;j<=n;j++)
{
dis[j][i]=dis[j][i-1]+dis[par[j][i-1]][i-1];
par[j][i]=par[par[j][i-1]][i-1];
}
}
dfs_sz(1,1);
centroid(1,0);
for(int i=1;i<=n;i++)
{
ll x=i,kk=0;
while(1)
{
opt[i][kk]=lca_dis(x,i);
++kk;
x=par_cen[x];
if(x==0)break;
}
}
for(int i=1;i<=n;i++)mn[i]=1e18;
}
void update(ll num,ll type)
{
ll u=num,kk=0;
while(1)
{
if(type==0)
{
mn[u]=min(mn[u],opt[num][kk]);
}else
{
mn[u]=1e18;
}
u=par_cen[u];
++kk;
if(u==0)break;
}
}
ll query(ll num)
{
ll u=num,val=1e18,kk=0;
while(1)
{
val=min(val,opt[num][kk]+mn[u]);
u=par_cen[u];
++kk;
if(u==0)break;
}
return val;
}
long long Query(int S, int X[], int T, int Y[])
{
for(int i=0;i<S;i++)
{
update(X[i]+1,0);
}
ll ans=1e18;
for(int i=0;i<T;i++)
{
ans=min(ans,query(Y[i]+1));
}
for(int i=0;i<S;i++)
{
update(X[i]+1,1);
}
return ans;
}
Compilation message
factories.cpp: In function 'void dfs(long long int, long long int)':
factories.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
13 | for(int i=0;i<v[u].size();i++)
| ~^~~~~~~~~~~~
factories.cpp: In function 'long long int dfs_sz(long long int, long long int)':
factories.cpp:52:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
52 | for(int i=0;i<v[u].size();i++)
| ~^~~~~~~~~~~~
factories.cpp: In function 'long long int find_cen(long long int, long long int, long long int)':
factories.cpp:62:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
62 | for(int i=0;i<v[u].size();i++)
| ~^~~~~~~~~~~~
factories.cpp: In function 'void centroid(long long int, long long int)':
factories.cpp:76:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
76 | for(int i=0;i<v[cen].size();i++)
| ~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12756 KB |
Output is correct |
| 2 |
Correct |
246 ms |
23900 KB |
Output is correct |
| 3 |
Correct |
286 ms |
23880 KB |
Output is correct |
| 4 |
Correct |
267 ms |
23884 KB |
Output is correct |
| 5 |
Correct |
291 ms |
24308 KB |
Output is correct |
| 6 |
Correct |
206 ms |
24016 KB |
Output is correct |
| 7 |
Correct |
280 ms |
23952 KB |
Output is correct |
| 8 |
Correct |
283 ms |
24028 KB |
Output is correct |
| 9 |
Correct |
283 ms |
24540 KB |
Output is correct |
| 10 |
Correct |
184 ms |
24012 KB |
Output is correct |
| 11 |
Correct |
271 ms |
23968 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
12576 KB |
Output is correct |
| 2 |
Correct |
2738 ms |
367496 KB |
Output is correct |
| 3 |
Correct |
7376 ms |
371340 KB |
Output is correct |
| 4 |
Correct |
947 ms |
365308 KB |
Output is correct |
| 5 |
Execution timed out |
8084 ms |
392924 KB |
Time limit exceeded |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12756 KB |
Output is correct |
| 2 |
Correct |
246 ms |
23900 KB |
Output is correct |
| 3 |
Correct |
286 ms |
23880 KB |
Output is correct |
| 4 |
Correct |
267 ms |
23884 KB |
Output is correct |
| 5 |
Correct |
291 ms |
24308 KB |
Output is correct |
| 6 |
Correct |
206 ms |
24016 KB |
Output is correct |
| 7 |
Correct |
280 ms |
23952 KB |
Output is correct |
| 8 |
Correct |
283 ms |
24028 KB |
Output is correct |
| 9 |
Correct |
283 ms |
24540 KB |
Output is correct |
| 10 |
Correct |
184 ms |
24012 KB |
Output is correct |
| 11 |
Correct |
271 ms |
23968 KB |
Output is correct |
| 12 |
Correct |
8 ms |
12576 KB |
Output is correct |
| 13 |
Correct |
2738 ms |
367496 KB |
Output is correct |
| 14 |
Correct |
7376 ms |
371340 KB |
Output is correct |
| 15 |
Correct |
947 ms |
365308 KB |
Output is correct |
| 16 |
Execution timed out |
8084 ms |
392924 KB |
Time limit exceeded |
| 17 |
Halted |
0 ms |
0 KB |
- |
