Submission #339751

#	Time	Username	Problem	Language	Result	Execution time	Memory
339751		Bill_00	Factories (JOI14_factories)	C++14	33 / 100	8079 ms	279704 KiB

factories

#include <stdio.h>
#include <stdlib.h>
#include <bits/stdc++.h>
#define MAX_N          500000
#define MAX_Q          100000
#define MAX_SUM_ST    1000000
#define MAX_VALUE  1000000000
#define ff first
#define ss second
#define pb push_back
#include "factories.h"
#define mp make_pair
typedef long long ll; 
using namespace std;
ll n,a[1000001],b[1000001],d[1000001],distnce[1000001],euler[5000000],k=0,first[1000001],belong[25][1000001],sz[1000001],centroid,nearest[1000001],o=0,p[1000001];
bool vis[1000001];
vector<int>vec;
ll st[25][2000001];
vector<pair<ll,ll> >adj[1000001];
void dfs(ll node,ll par,ll dis){
  distnce[node]=dis;
  for(int i=0;i<adj[node].size();i++){
    if(adj[node][i].ff!=par){
      dfs(adj[node][i].ff,node,dis+adj[node][i].ss);
    }
  }
}
void build(ll node,ll par){
  k++;
  euler[k]=distnce[node];
  first[node]=k;
  for(int i=0;i<adj[node].size();i++){
    if(adj[node][i].ff!=par){
      build(adj[node][i].ff,node);
      k++;
      euler[k]=distnce[node];
    }
  }
}
void dfs1(ll node,ll par){
  sz[node]=1;
  for(int i=0;i<adj[node].size();i++){
    if(adj[node][i].ff!=par && vis[adj[node][i].ff]==0){
      dfs1(adj[node][i].ff,node);
      sz[node]+=sz[adj[node][i].ff];
    }
  }
}
void solve(ll node,ll par,ll level,ll parent){
	// cout << node << '\n';
  o++;
  dfs1(node,par);
  ll cent=node;
  while(1){
    bool f=true;
    for(int i=0;i<adj[cent].size();i++){
      if(sz[adj[cent][i].ff]<sz[cent] && vis[adj[cent][i].ff]==0 && sz[adj[cent][i].ff]*2>sz[node]){
        f=false;
        cent=adj[cent][i].ff;
        break;
      }
    }
    if(f) break;
  }
  centroid=cent;
  // cout << cent << ' ' << level << '\n';
  p[cent]=parent;
  vis[cent]=1;
  for(int i=0;i<adj[cent].size();i++){
    if(vis[adj[cent][i].ff]==0){
      solve(adj[cent][i].ff,-1,level+1,cent);
    }
  }
}
void Init(int N, int A[], int B[], int D[]) {
  n=(ll)N;
  for(int i=0;i<(N-1);i++){
    a[i]=(ll)A[i];
    b[i]=(ll)B[i];
    d[i]=(ll)D[i];
    adj[a[i]].pb(mp(b[i],d[i]));
    adj[b[i]].pb(mp(a[i],d[i]));
  }
  dfs(0,-1,0);
  build(0,-1);
  for(int i=1;i<=k;i++){
    st[0][i]=euler[i];
  }
  int l=log2(k);
  for(int i=1;i<=l;i++){
    for(int j=1;j<=(k-(1<<i)+1);j++){
      st[i][j]=min(st[i-1][j],st[i-1][j+(1<<(i-1))]);
    }
  }
  solve(0,-1,1,-1);
  for(int i=0;i<n;i++){
    nearest[i]=1e18;
  }
}
ll dist(int x,int y){
  int xx=min(first[x],first[y]);
  int yy=max(first[x],first[y]);
  // cout << xx << ' ' << yy << '\n';
  int z=log2(yy-xx+1);
  ll mn=(min(st[z][xx],st[z][yy-(1<<z)+1]));
  return distnce[x]+distnce[y]-2*mn;
}
void add(int node,int cent){
  if(cent==-1) return;
  nearest[cent]=min(nearest[cent],dist(node,cent));
  // cout << node << ' ' << cent << ' ' << nearest[cent] << '\n';
  vec.pb(cent);
  add(node,p[cent]);
}
ll query(int node,int cent){
  if(cent==-1) return 2e18;
  return min(nearest[cent]+dist(node,cent),query(node,p[cent]));
}
long long Query(int S, int X[], int T, int Y[]) {
  for(int i=0;i<S;i++){
    add(X[i],X[i]);
  }
  ll ans=2e18;
  for(int i=0;i<T;i++){
    ans=min(ans,query(Y[i],Y[i]));
  }
  for(int i=0;i<vec.size();i++){
  	nearest[vec[i]]=1e18;
  }
  vec.clear();
  return ans;
}

Compilation message (stderr)

factories.cpp: In function 'void dfs(ll, ll, ll)':
factories.cpp:22:16: 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]
   22 |   for(int i=0;i<adj[node].size();i++){
      |               ~^~~~~~~~~~~~~~~~~
factories.cpp: In function 'void build(ll, ll)':
factories.cpp:32:16: 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]
   32 |   for(int i=0;i<adj[node].size();i++){
      |               ~^~~~~~~~~~~~~~~~~
factories.cpp: In function 'void dfs1(ll, ll)':
factories.cpp:42:16: 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]
   42 |   for(int i=0;i<adj[node].size();i++){
      |               ~^~~~~~~~~~~~~~~~~
factories.cpp: In function 'void solve(ll, ll, ll, ll)':
factories.cpp:56:18: 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]
   56 |     for(int i=0;i<adj[cent].size();i++){
      |                 ~^~~~~~~~~~~~~~~~~
factories.cpp:69:16: 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]
   69 |   for(int i=0;i<adj[cent].size();i++){
      |               ~^~~~~~~~~~~~~~~~~
factories.cpp: In function 'long long int Query(int, int*, int, int*)':
factories.cpp:127:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  127 |   for(int i=0;i<vec.size();i++){
      |               ~^~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 18 / 18
• Subtask 3: 0 / 67