Submission #587121

#	Time	Username	Problem	Language	Result	Execution time	Memory
587121		yutabi	Cave (IOI13_cave)	C++14	100 / 100	801 ms	656 KiB

cave

#include "cave.h"




int c[5000];

int d[5000];

int s[5000];




void exploreCave(int N)
{
    for(int i=0;i<N;i++)
    {
        c[i]=-1;
    }

    for(int i=0;i<N;i++)
    {
        for(int j=0;j<N;j++)
        {
            s[j]=c[j];

            if(s[j]==-1)
            {
                s[j]=0;
            }
        }

        int res=tryCombination(s);

        if(res==-1)
        {
            res=N;
        }

        int correct=1;

        if(res>i)
        {
            correct=0;
        }

        int l=0;
        int r=N-1;
        
        while(l!=r)
        {
            int m=(l+r)/2;

            for(int j=0;j<N;j++)
            {
                s[j]=c[j];

                if(s[j]==-1)
                {
                    if(j<=m)
                    {
                        s[j]=correct;
                    }

                    else
                    {
                        s[j]=(correct+1)%2;
                    }
                }
            }

            res=tryCombination(s);

            if(res==-1)
            {
                res=N;
            }

            if(res>i)
            {
                r=m;
            }

            else
            {
                l=m+1;
            }
        }

        c[l]=correct;
        d[l]=i;
    }

    answer(c,d);
}

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24