Submission #883548

#	Time	Username	Problem	Language	Result	Execution time	Memory
883548		nghiaaa	Harbingers (CEOI09_harbingers)	C++14	20 / 100	120 ms	37904 KiB

harbingers

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define db double
#define ii pair<int,int>
#define f first
#define s second
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define all(v) v.begin(),v.end()
#define BIT(i) ((ll)1<<(i))
#define endl "\n"
#define debug(x) for (auto p: x) cout<<p<<' ';cout<<endl
#define forw(i,j,z) for(int i=(int)j;i<=(int)z;i++)
#define forw2(i,j,z,k) for(int i=(int)j;i<=(int)z;i+=k)
#define ford(i,j,z) for (int i=(int)j;i>=(int)z;i--)
#define ford2(i,j,z,k) for (int i=(int)j;i>=(int)z;i-=k)
#define sz(a) (int)a.size()
const int N=1e5;
const ll inf=LLONG_MAX;
const int smallinf=1e9+1;
struct Line{
    ll a,b;
    Line(){}
    Line(ll a1,ll b1):a(a1),b(b1){}
    ll operator ()(const ll x) const{
        return a*x+b;
    }
};
int timeDFS=0,n,prepare[N+1],velocity[N+1];
vector<ii> adj[N+1];
ll dp[N+1],h[N+1];
struct seg{
    int id=1;
    seg *L=NULL,*R=NULL;
}; seg *BIGTREE=new seg;
vector<pair<bool,int> > changes[N+1];
vector<Line> origin(N+1);
void update(int u,int l=1,int r=smallinf,seg *tree=BIGTREE,bool ready=false)
{
    if (u==1||(ready&&tree->id==1)) return ;
    if (l+1==r){
        if (origin[tree->id](l) > origin[u](l))
            tree->id=u;
    }
    else{
        int mid=(l+r)>>1;
        if (origin[tree->id].a>origin[u].a){
             swap(tree->id,u);
        }
        if (origin[tree->id](mid)<origin[u](mid))
        {
            if (tree->L==NULL) tree->L=new seg;
            changes[timeDFS].push_back(mp(0,tree->L->id));
            update(u,l,mid,tree->L);
        }
        else{
            swap(tree->id,u);
            if (tree->R==NULL) tree->R=new seg;
            changes[timeDFS].push_back(mp(1,tree->R->id));
            update(u,mid,r,tree->R,1);
        }
    }
}
ll query(ll x,int l=1,int r=smallinf,seg *tree=BIGTREE)
{
    if (tree==NULL) return origin[1](x);
    if (l+1==r) return origin[tree->id](x);
    int mid=(l+r)>>1;
    if (x<mid) return min(origin[tree->id](x),query(x,l,mid,tree->L));
    else return min(origin[tree->id](x),query(x,mid,r,tree->R));
}
void dfs(int u,int dad)
{
    int now=++timeDFS;
    if (u>1){
        dp[u]=query(velocity[u])+h[u]*velocity[u]+prepare[u];
        origin[now]=Line(-h[u],dp[u]);
        changes[now].push_back(mp(0,BIGTREE->id));
        update(now);
    }
    forw(i,0,sz(adj[u])-1) if (adj[u][i].f!=dad)
    {
        int v=adj[u][i].f,d=adj[u][i].s;
        h[v]=h[u]+d;
        dfs(v,u);
    }
    if (u>1){
        seg *tree=BIGTREE;
        tree->id=changes[now][0].s;
        forw(i,1,sz(changes[now])-1)
        {
            if (!changes[now][i].f) tree=tree->L;
            else tree=tree->R;
            tree->id=changes[now][i].s;
        }
        changes[now].clear();
    }
}
void solve()
{
    origin[1]=Line(0,0);
    update(1,smallinf,1);
    cin>>n;
    forw(i,2,n)
    {
        int u,v,d;
        cin>>u>>v>>d;
        adj[u].push_back(mp(v,d));
        adj[v].push_back(mp(u,d));
    }
    forw(i,2,n) cin>>prepare[i]>>velocity[i];
    dfs(1,1);
    forw(i,2,n) cout<<dp[i]<<' ';
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    //cout<<setprecision(6)<<fixed;
    //time_t TIME_TU=clock();
    int t=1;
    //cin>>t;
    while(t--)
        solve();
    //time_t TIME_TV=clock();
    //cerr<<(db)(TIME_TV-TIME_TU)/CLOCKS_PER_SEC<<endl;
    return 0;
}

• Subtask 1: 20 / 100