#include<bits/stdc++.h>
#include "factories.h"
#define ll long long
#define int long long
#define ld long double
#define cd complex<ld>
#define pll pair<ll,ll>
#define pii pair<int,int>
#define pld pair<ld,ld>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std ;
ll n ;
ll num = 3000 ;
vector<pll> T[500005] ;
ll depth[500005] ;
ll dis[500005] ;
ll lg2[1000005] ;
ll Left[500005] ;
vector<ll> euler ;
vector<pll> sparse[20] ;
void build()
{
for(int i = 0 ; i< 20 ; i++)
{
if((1<<i)>euler.size()) break ;
if(i==0)
{
sparse[0].assign(euler.size() , {0 , 0}) ;
for(int j = 0 ; j< euler.size() ; j++)
{
sparse[0][j] = {depth[euler[j]], euler[j]} ;
}
}
else
{
sparse[i].assign(euler.size()+1-(1<<i) , {0 , 0}) ;
for(int j = 0 ; j< euler.size()-(1<<i)+1 ; j++)
{
sparse[i][j] = min(sparse[i-1][j] , sparse[i-1][j+(1<<(i-1))]) ;
}
}
}
}
ll LCA(ll u , ll v)
{
u = Left[u] , v = Left[v] ;
if(u>v) swap(u , v) ;
ll k = lg2[v-u+1] ;
pll x = min(sparse[k][u] , sparse[k][v-(1<<k)+1]) ;
return x.se ;
}
void dfs(ll v , ll par)
{
Left[v] = euler.size() ;
euler.push_back(v) ;
for(int i = 0 ; i< T[v].size() ; i++)
{
if(T[v][i].fi==par) continue ;
dis[T[v][i].fi] = T[v][i].se+dis[v] ;
depth[T[v][i].fi] = depth[v]+1 ;
dfs(T[v][i].fi , v) ;
euler.push_back(v) ;
}
}
void Init(int N, int A[], int B[], int D[])
{
n = N ;
for(int i = 0 ; i< n-1 ; i++)
{
T[A[i]].push_back(mp(B[i] , D[i])) ;
T[B[i]].push_back(mp(A[i] , D[i])) ;
}
for(int i = 2 ; i<= 1000000 ; i++) lg2[i] = lg2[i/2]+1 ;
dfs(0 , -1);
build() ;
}
ll distance(ll u , ll v)
{
ll k = LCA(u , v) ;
//cout << u << " " << v << " " << k << "\n" ;
//cout << dis[u]+dis[v]-2*dis[k] << "\n" ;
return dis[u]+dis[v]-2*dis[k] ;
}
ll dist[500005] = {} ;
bool check[500005] = {} ;
ll Query(int N, int X[], int M, int Y[])
{
//cout<< N << " " << M << "\n" ;
if(N*M>num)
{
for(int i = 0 ; i<= 500000 ; i++) dist[i] = LLONG_MAX ;
priority_queue<pll , vector<pll> , greater<pll>> q ;
for(int i = 0 ; i< N ;i++)
{
dist[X[i]] = 0 ;
q.push(mp(0 , X[i])) ;
}
while(!q.empty())
{
ll le = q.top().fi , x = q.top().se;
q.pop() ;
if(le!=dist[x]||check[x]) continue ;
check[x] = 1 ;
//cout << T[x][0].fi << "\n" ;
for(int i = 0 ; i< T[x].size() ; i++)
{
if(dist[T[x][i].fi]>T[x][i].se+le)
{
dist[T[x][i].fi] = T[x][i].se+le ;
q.push(mp(dist[T[x][i].fi] , T[x][i].fi)) ;
}
}
}
ll ans = LLONG_MAX ;
for(int i = 0 ; i< M ; i++)
{
ans = min(ans , dist[Y[i]]) ;
}
return ans ;
}
else
{
ll ans = LLONG_MAX ;
for(int i = 0 ; i< N ; i++)
{
for(int j = 0 ; j< M ; j++)
{
ans = min(ans , distance(X[i] , Y[j])) ;
}
}
return ans ;
}
return 0;
}
Compilation message
factories.cpp: In function 'void build()':
factories.cpp:28:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
28 | if((1<<i)>euler.size()) break ;
| ~~~~~~^~~~~~~~~~~~~
factories.cpp:32:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
32 | for(int j = 0 ; j< euler.size() ; j++)
| ~^~~~~~~~~~~~~~
factories.cpp:40:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
40 | for(int j = 0 ; j< euler.size()-(1<<i)+1 ; j++)
| ~^~~~~~~~~~~~~~~~~~~~~~~
factories.cpp: In function 'void dfs(long long int, long long int)':
factories.cpp:59:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
59 | for(int i = 0 ; i< T[v].size() ; i++)
| ~^~~~~~~~~~~~~
factories.cpp: In function 'long long int Query(long long int, long long int*, long long int, long long int*)':
factories.cpp:108:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
108 | for(int i = 0 ; i< T[x].size() ; i++)
| ~^~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccLjgfX9.o: in function `main':
grader.cpp:(.text.startup+0x37d): undefined reference to `Init(int, int*, int*, int*)'
/usr/bin/ld: grader.cpp:(.text.startup+0x412): undefined reference to `Query(int, int*, int, int*)'
collect2: error: ld returned 1 exit status
