Submission #719109

#	Time	Username	Problem	Language	Result	Execution time	Memory
719109		bin9638	Rail (IOI14_rail)	C++17	56 / 100	364 ms	98960 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 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];
}

void solve(vector<int>s,int moc,int val)
{
    while(!s.empty())
    {
        vector<int>luu;
        int u=-1;
        for(auto i:s)
            if(u==-1||my_ask(i,moc)<my_ask(u,moc))
                u=i;
        if(val==0)
            location[u]=location[moc]-my_ask(u,moc);
                else location[u]=location[moc]+my_ask(u,moc);
        stype[u]=val;
        for(auto i:s)
            if(i!=u)
            {
                if(my_ask(moc,i)==my_ask(moc,u)+my_ask(u,i))
                {
                    location[i]=(val==0 ? location[u]+my_ask(u,i) : location[u]-my_ask(u,i));
                    stype[i]=(val^1);
                }else
                {
                    luu.pb(i);
                }
            }
        s=luu;
    }
}

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=-1;
    for(int i=0;i<n;i++)
        if(i!=R&&(L==-1||my_ask(i,R)<my_ask(L,R)))
            L=i;
    location[L]=location[R]-my_ask(L,R);
    stype[L]=0;
    //cout<<L<<" "<<R<<endl;
    vector<int>lis_left,list_right;
    for(int i=0;i<n;i++)
        if(i!=L&&i!=R)
        {
            if(my_ask(i,L)>my_ask(i,R))
                lis_left.pb(i);
                    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: 0 / 44