Submission #395354

#	Time	Username	Problem	Language	Result	Execution time	Memory
395354		jjang36524	Rail (IOI14_rail)	C++14	30 / 100	109 ms	644 KiB

rail

#include "rail.h"
#include <bits/stdc++.h>
#define int long long
using namespace std;
int zero[3001];
int one[3001];
int op;
void findLocation(signed N, signed first, signed location[], signed stype[])
{
    int i;
    pair<int,int>mi={1LL<<60,1};
    for(i=1;i<N;i++)
    {
        zero[i]=getDistance(0,i);
        mi=min(mi,make_pair(zero[i],i));
    }
    stype[0]=1;
    location[mi.second]=mi.first;
    stype[mi.second]=2;
    one[0]=mi.first;
    vector<pair<int,int>>le;
    vector<pair<int,int>>re;
    for(i=0;i<N;i++)
    {
        if(i==mi.second||i==0)
            continue;
        one[i]=getDistance(mi.second,i);
        if(zero[i]==one[i]+mi.first)
            le.push_back({one[i],i});
        else
            re.push_back({zero[i],i});
    }
    sort(le.begin(),le.end());
    sort(re.begin(),re.end());
    for(i=0;i<le.size();i++)
    {
        stype[le[i].second]=1;
        location[le[i].second]=mi.first-le[i].first;
        int firstdis=0;
        int firstp=0;
        int j;
        for(j=i-1;j>=0;j--)
        {
            if(stype[le[j].second]==1)
            {
                    firstdis=getDistance(le[i].second,le[j].second);
                    firstp=location[le[j].second];
                    break;
            }
        }
        if(firstdis==0)
        {
            firstdis=getDistance(le[i].second,0);
            firstp=0;
        }
        for(j=0;j<i;j++)
        {
            if(stype[le[j].second]==1)
            {
                if(firstdis-location[le[j].second]+firstp+one[le[j].second]==one[le[i].second])
                {
                    stype[le[i].second]=2;
                    location[le[i].second]=firstp+firstdis;
                    break;
                }

            }
        }
    }
    for(i=0;i<re.size();i++)
    {
        stype[re[i].second]=2;
        location[re[i].second]=re[i].first;
        int firstdis=0;
        int firstp=0;
        int j;
        for(j=i-1;j>=0;j--)
        {
            if(stype[re[j].second]==2)
            {
                firstdis=getDistance(re[i].second,re[j].second);
                firstp=location[re[j].second];
                break;
            }
        }
        if(firstdis==0)
        {
            firstdis=getDistance(re[i].second,mi.second);
            firstp=location[mi.second];
        }
        for(j=0;j<i;j++)
        {
            if(stype[re[j].second]==2)
            {

                if(firstdis+location[re[j].second]-firstp+zero[re[j].second]==zero[re[i].second])
                {
                    stype[re[i].second]=1;
                    location[re[i].second]=firstp-firstdis;
                    break;
                }

            }
        }
    }
    for(i=0;i<N;i++)
        location[i]+=first;

}

Compilation message (stderr)

rail.cpp: In function 'void findLocation(int, int, int*, int*)':
rail.cpp:35:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     for(i=0;i<le.size();i++)
      |             ~^~~~~~~~~~
rail.cpp:70:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |     for(i=0;i<re.size();i++)
      |             ~^~~~~~~~~~

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