Submission #15779

#	Time	Username	Problem	Language	Result	Execution time	Memory
15779		gs13068	Rail (IOI14_rail)	C++98	100 / 100	232 ms	844 KiB

rail

#include "rail.h"
#include<algorithm>

std::pair<int,int> a[5555];
int c[5555];
int d[5555];

void findLocation(int n,int fir,int loc[],int stp[])
{
	int i,j,k,l,sec,le,ri,t;
    loc[0]=fir;
    stp[0]=1;
    fir=0;
	for(i=1;i<n;i++)
	{
        c[i]=getDistance(fir,i);
        a[i].first=c[i];
        a[i].second=i;
	}
	sec=std::min_element(a+1,a+n)->second;
    loc[sec]=loc[fir]+c[sec];
    stp[sec]=2;
    for(i=1;i<n;i++)
	{
        d[i]=getDistance(sec,i);
        a[i].first=std::min(c[i],d[i]);
	}
	std::sort(a+1,a+n);
	le=fir;
	ri=sec;
	for(i=2;i<n;i++)
	{
		j=a[i].second;
        if(c[j]==d[j]+c[sec])
		{
            t=getDistance(le,j);
            l=-1;
            for(k=0;k<i;k++)if(stp[a[k].second]==1&&loc[a[k].second]<loc[le]+t&&(l==-1||loc[a[k].second]>loc[l]))l=a[k].second;
            if(l>=0&&d[j]==loc[sec]-loc[l]+loc[le]+t-loc[l])
			{
                loc[j]=loc[le]+t;
                stp[j]=2;
			}
			else
			{
				loc[j]=loc[sec]-d[j];
                stp[j]=1;
                if(loc[j]<loc[le])le=j;
			}
		}
		else
		{
            t=getDistance(ri,j);
            l=-1;
            for(k=0;k<i;k++)if(stp[a[k].second]==2&&loc[a[k].second]>loc[ri]-t&&(l==-1||loc[a[k].second]<loc[l]))l=a[k].second;
            if(l>=0&&c[j]==loc[l]-loc[fir]+loc[l]-loc[ri]+t)
			{
                loc[j]=loc[ri]-t;
                stp[j]=1;
			}
			else
			{
				loc[j]=loc[fir]+c[j];
                stp[j]=2;
                if(loc[j]>loc[ri])ri=j;
			}
		}
	}
}

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