Submission #835323

#	Time	Username	Problem	Language	Result	Execution time	Memory
835323		Liudas	Rail (IOI14_rail)	C++17	100 / 100	52 ms	872 KiB

rail

#include "rail.h"
#include <set>
#include <vector>
#include <numeric>
#include <algorithm>
#include <iostream>
#include <map>
using namespace std;
void findLocation(int N, int first, int location[], int stype[])
{
    int lid = 0, rid = -1;
    vector<int> dist(N);
    for(int i = 0; i < N; i ++){
        if(i == lid)continue;
        int temp = getDistance(lid, i);
        dist[i] = temp;
    }
    vector<int> order(N);
    iota(order.begin(), order.end(), 0);
    sort(order.begin(), order.end(), [&](int a, int b){return dist[a] < dist[b];});
    rid = order[1];
    lid = order[0];
    stype[order[0]] = 1;
    stype[order[1]] = 2;
    location[order[0]] = first;
    location[order[1]] = first + dist[rid];
    map<int, int> at;
    at[location[order[0]]] = order[0];
    at[location[order[1]]] = order[1];
    for(int i : order){
        if(stype[i])continue;
        int t1 = getDistance(i, lid);
        int t2 = getDistance(i, rid);
        int push = (location[lid] + location[rid] + t1 - t2)/2;
        int last = at.find(push) == at.end() ? (push > first ? 1 : 2) : stype[at[push]];
        if(last == 1){
            stype[i] = 2;
            location[i] = location[lid] + t1;
            if(location[i] > location[rid])rid = i;
        }
        else{
            stype[i] = 1;
            location[i] = location[rid] - t2;
            if(location[i] < location[lid])lid = i;
        }
        at[location[i]] = i; 
    }
}

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