Submission #1102129

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102129		alexander707070	Rail (IOI14_rail)	C++14	56 / 100	72 ms	764 KiB

rail

#include<bits/stdc++.h>
#include "rail.h"

#define MAXN 1000007
using namespace std;

int n,pos;
pair<int,int> block[MAXN];
pair<int,int> dist[5007];
int last;

vector<int> clos;
int sum[MAXN];

void findLocation(int N, int first, int location[], int stype[]){
    n=N;
    block[first]={0,0};

    location[0]=first;
    stype[0]=1;

    for(int i=1;i<n;i++){
        dist[i].first=getDistance(0,i);
        dist[i].second=i;
    }

    sort(dist+1,dist+n);

    last=1;
    location[dist[1].second]=first+dist[1].first;
    stype[dist[1].second]=2;
    clos.push_back(1);

    for(int i=2;i<n;i++){
 
        bool ok=true;
        for(int f:clos){
            if(dist[f].first+getDistance(dist[f].second,dist[i].second)==dist[i].first){
                ok=false; break;
            }
        }
 
        if(ok){
            clos.push_back(i);
            last=i;
 
            stype[dist[i].second]=2;
            location[dist[i].second]=first+dist[i].first;
        }
    }

    int special=dist[last].second;
    int fin=location[special];

    for(int i=0;i<n;i++){
        dist[i].first=getDistance(special,i);
        dist[i].second=i;
    }

    sort(dist,dist+n);

    last=1;
    location[dist[1].second]=fin-dist[1].first;
    stype[dist[1].second]=1;
    clos={1};

    for(int i=2;i<n;i++){
        //cout<<"checking "<<dist[i].second<<"\n";

        bool ok=true;
        int curr=getDistance(dist[last].second,dist[i].second);
        int where=location[dist[last].second]+curr;

        int nearest=last;
        for(int f:clos){
            if(location[dist[f].second]<=where and location[dist[f].second]>location[dist[nearest].second])nearest=f;
        }

        if(dist[i].first == dist[nearest].first + (where-location[dist[nearest].second])){
            stype[dist[i].second]=2;
            location[dist[i].second]=where;

            //cout<<"its backward\n";
            continue;
        }

        if(ok){
            //cout<<"new last\n";
            last=i;

            stype[dist[i].second]=1;
            location[dist[i].second]=fin-dist[i].first;
            clos.push_back(i);
        }
    }

    return;
}

/*
3
8
1 0
2 2
1 3
2 5
2 6
1 7
1 8
2 10


*/

• Subtask 1: 8 / 8
• Subtask 2: 22 / 22
• Subtask 3: 26 / 26
• Subtask 4: 0 / 44