제출 #656689

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
656689		Hiennoob123	공장들 (JOI14_factories)	C++14	100 / 100	4528 ms	293216 KiB

factories

#include<bits/stdc++.h>
#include "factories.h"
#define ll 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 = 700 ;
vector<pair<int , ll>> T[500005]  ;
vector<ll> Tc[500005] ;
int depth[500005] ;
ll dis[500005] ;
int lg2[1000005] ;
int Left[500005] ;
bool check[500005] ;
ll sz[500005] ;
ll pa[500005] ;
vector<int> euler ;
vector<pair<int , int>> 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) ;
    int k = lg2[v-u+1] ;
    pair<int , ll> x = min(sparse[k][u] , sparse[k][v-(1<<k)+1]) ;
    return x.se ;
}
ll distance(ll u , ll v)
{
    int k = LCA(u , v) ;
    return dis[u]+dis[v]-2*dis[k] ;
}
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) ;
    }
}
ll dfs_cnt(ll v , ll par)
{
    sz[v] = 1 ;
    for(int i = 0 ; i< T[v].size() ; i++)
    {
        if(T[v][i].fi==par||check[T[v][i].fi]) continue ;
        sz[v] += dfs_cnt(T[v][i].fi , v) ;
    }
    return sz[v] ;
}
ll getcent(ll v , ll par , ll siz)
{
    for(int i = 0 ; i< T[v].size() ; i++)
    {
        if(T[v][i].fi==par||check[T[v][i].fi]) continue ;
        if(sz[T[v][i].fi]*2>=siz) return getcent(T[v][i].fi , v , siz) ;
    }
    return v ;
}
void centroid(ll v , ll par)
{
    ll k = getcent(v , -1 , dfs_cnt(v , -1)) ;
    //cout << k << " " << par << "\n" ;
    pa[k] = par ;
    if(par!=-1)
    {
        Tc[par].push_back(v) ;
    }
    check[k] = 1 ;
    for(int i = 0; i< T[k].size() ; i++)
    {
        if(check[T[k][i].fi]) continue ;
        centroid(T[k][i].fi , k) ;
    }
}
ll val[500005] = {} ;
void Init(int N, int A[], int B[], int D[])
{
    n = N ;
    num = 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() ;
    centroid(0 , -1) ;
    for(int i = 0; i<= n;  i++) val[i] = LLONG_MAX ;
}
ll Query(int N, int X[], int M, int Y[])
{
    //cout << -1 ;
    for(int i = 0 ; i< N ; i++)
    {
        ll cur = X[i] ;
        while(cur!=-1)
        {
            //cout << cur << "\n" ;
            val[cur] = min(val[cur] , dis[cur]+dis[X[i]]-2*dis[LCA(cur , X[i])] );
            cur = pa[cur] ;
        }
    }
    ll ans = LLONG_MAX ;
    for(int i = 0; i < M ; i++)
    {
        ll cur = Y[i] ;
        while(cur!=-1)
        {
            //cout << cur << "\n" ;
            if(val[cur]!=LLONG_MAX) ans = min(ans , val[cur]+dis[cur]+dis[Y[i]]-2*dis[LCA(cur , Y[i])]) ;
            cur = pa[cur] ;
        }
    }
    for(int i = 0 ; i< N ; i++)
    {
        ll cur = X[i] ;
        while(cur!=-1)
        {
            val[cur] = LLONG_MAX ;
            cur = pa[cur] ;
        }
    }
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

factories.cpp: In function 'void build()':
factories.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         if((1<<i)>euler.size()) break ;
      |            ~~~~~~^~~~~~~~~~~~~
factories.cpp:35:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |             for(int j = 0 ; j< euler.size() ; j++)
      |                             ~^~~~~~~~~~~~~~
factories.cpp:43:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |             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:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     for(int i = 0 ; i< T[v].size() ; i++)
      |                     ~^~~~~~~~~~~~~
factories.cpp: In function 'long long int dfs_cnt(long long int, long long int)':
factories.cpp:79:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |     for(int i = 0 ; i< T[v].size() ; i++)
      |                     ~^~~~~~~~~~~~~
factories.cpp: In function 'long long int getcent(long long int, long long int, long long int)':
factories.cpp:88:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |     for(int i = 0 ; i< T[v].size() ; i++)
      |                     ~^~~~~~~~~~~~~
factories.cpp: In function 'void centroid(long long int, long long int)':
factories.cpp:105:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |     for(int i = 0; i< T[k].size() ; i++)
      |                    ~^~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 18 / 18
• Subtask 3: 67 / 67