Submission #719148

#	Time	Username	Problem	Language	Result	Execution time	Memory
719148		bin9638	Rail (IOI14_rail)	C++17	100 / 100	117 ms	98900 KiB

rail

#include <bits/stdc++.h>

#ifndef SKY
#include "rail.h"
#endif // SKY

using namespace std;

#define N  5010
#define ll long long
#define fs first
#define sc second
#define ii pair<int,int>
#define pb push_back
#define iii pair<int,pair<int,int>>

int wibu_never_die,dis[N][N],n,location[N],stype[N];

#ifdef SKY
int pos[N],type[N];
int getDistance(int u,int v)
{
    if(pos[u]>pos[v])
        swap(u,v);
    if(u==v)
        return 0;
    int L=-1,R=-1;
    for(int i=0;i<n;i++)
        if(type[i]==0&&pos[i]<=pos[u]&&(L==-1||pos[i]>pos[L]))
            L=i;
    for(int i=0;i<n;i++)
        if(type[i]==1&&pos[i]>=pos[v]&&(R==-1||pos[i]<pos[R]))
            R=i;
    return  pos[R]-pos[L]+(pos[u]-pos[L])+(pos[R]-pos[v]);
}
#endif // SKY

int my_ask(int u,int v)
{
    if(u==v)
        return 0;
    if(dis[u][v]!=-1)
        return dis[u][v];
    dis[u][v]=dis[v][u]=getDistance(u,v);
    return dis[u][v];
}

bool SS(const int&u,const int&v)
{
    return my_ask(u,wibu_never_die)<my_ask(v,wibu_never_die);
}

void solve(vector<int>s,int moc,int val)
{
    if(s.empty())
        return;
    wibu_never_die=moc;
    sort(s.begin(),s.end(),SS);
    vector<int>lis;
    for(auto i:s)
    {
        if(i==s[0])
        {
            lis.pb(i);
            stype[i]=val;
            location[i]=(val==0 ? location[moc]-my_ask(i,moc) : location[moc]+my_ask(i,moc));
            continue;
        }
        if(val==0)
        {
            int length=my_ask(lis.back(),moc)-my_ask(lis.back(),i),vt=-1;
            for(int j=lis.size()-1;j>=0;j--)
                if(vt==-1||my_ask(moc,lis[j])>=length)
                    vt=lis[j];
            length=my_ask(moc,vt)-length;
            if(my_ask(moc,i)==length+my_ask(moc,vt))
            {
                stype[i]=(val^1);
                location[i]=location[vt]+length;
            }else
            {
                 lis.pb(i);
                stype[i]=val;
                location[i]=(val==0 ? location[moc]-my_ask(i,moc) : location[moc]+my_ask(i,moc));
            }
        }else
        {
            int length=my_ask(lis.back(),moc)-my_ask(lis.back(),i),vt=-1;
            for(int j=lis.size()-1;j>=0;j--)
                if(vt==-1||my_ask(moc,lis[j])>=length)
                    vt=lis[j];
            length=my_ask(moc,vt)-length;
            if(my_ask(moc,i)==length+my_ask(moc,vt))
            {
                stype[i]=(val^1);
                location[i]=location[vt]-length;
            }else
            {
                 lis.pb(i);
                stype[i]=val;
                location[i]=(val==0 ? location[moc]-my_ask(i,moc) : location[moc]+my_ask(i,moc));
            }
        }
    }
}

void findLocation(int cc, int first, int location_ans[], int stype_ans[])
{
    n=cc;
    memset(dis,-1,sizeof(dis));
    location[0]=first;
    stype[0]=0;
    int R=-1;
    for(int i=1;i<n;i++)
        if(R==-1||my_ask(i,0)<my_ask(R,0))
            R=i;
    location[R]=location[0]+my_ask(R,0);
    stype[R]=1;
    int L=0;
    vector<int>lis_left,list_right;
    for(int i=0;i<n;i++)
        if(i!=L&&i!=R)
        {
            if(my_ask(L,i)==my_ask(L,R)+my_ask(i,R)&&my_ask(i,R)<=my_ask(L,R))
            {
                location[i]=location[R]-my_ask(i,R);
                stype[i]=0;
                continue;
            }
            if(my_ask(i,L)-my_ask(L,R)==my_ask(i,R))
                lis_left.pb(i);//,cout<<i<<endl;
                    else list_right.pb(i);
        }
    solve(lis_left,R,0);
    solve(list_right,L,1);
    for(int i=0;i<n;i++)
    {
        stype[i]++;
        location_ans[i]=location[i];
        stype_ans[i]=stype[i];
    }
    #ifdef SKY
    for(int i=0;i<n;i++)
        cout<<location[i]<<" "<<stype[i]<<endl;
    #endif // SKY
}

#ifdef SKY
int main()
{
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>pos[i]>>type[i];
    int location[n],stype[n];
    findLocation(n,pos[0],location,stype);
    return 0;
}
#endif

• Subtask 1: 8 / 8
• Subtask 2: 22 / 22
• Subtask 3: 26 / 26
• Subtask 4: 44 / 44