Submission #7528

#	Time	Username	Problem	Language	Result	Execution time	Memory
7528		baneling100	Cave (IOI13_cave)	C++98	100 / 100	440 ms	640 KiB

cave

#include "cave.h"
#include <vector>

using namespace std;

vector <int> A;
int S[5000], D[5000], Check[5000];

void exploreCave(int N)
{
    int i, j, Left, Mid, Right, Value, Temp;

    for(i=0 ; i<N ; i++)
    {
        A.clear();
        for(j=0 ; j<N ; j++)
            if(!Check[j])
                A.push_back(j);
        Left=0;
        Right=A.size()-1;
        Value=tryCombination(S);
        while(Left<Right)
        {
            Mid=(Left+Right)/2;
            for(j=Left ; j<=Mid ; j++)
                S[A[j]]=1-S[A[j]];
            Temp=tryCombination(S);
            for(j=Left ; j<=Mid ; j++)
                S[A[j]]=1-S[A[j]];
            if(Value==i)
            {
                if(Temp>i || Temp==-1)
                    Right=Mid;
                else
                    Left=Mid+1;
            }
            else
            {
                if(Temp==i)
                    Right=Mid;
                else
                    Left=Mid+1;
            }
        }
        if(Value==i)
            S[A[Left]]=1-S[A[Left]];
        D[A[Left]]=i;
        Check[A[Left]]=1;
    }
    answer(S,D);
}

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