Submission #101358

#	Time	Username	Problem	Language	Result	Execution time	Memory
101358		naoai	Cave (IOI13_cave)	C++14	100 / 100	403 ms	640 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;

const int nmax = 5000;

bool viz[nmax + 1];
int v[nmax + 1];
int s[nmax + 1], d[nmax + 1];

void divide (int x, int y, int ind, int lst) {
    if (lst == -1)
        lst = nmax + 1;

    if (x == y) {
        s[x] = (lst > ind ? v[x] : 1 - v[x]);
        d[x] = ind;
        viz[x] = 1;
        return ;
    }

    int mij = (x + y) / 2;
    for (int i = x; i <= mij; ++ i)
        if (viz[i] == 0)
            v[i] ^= 1;

    int val = tryCombination(v);
    if (val == -1)
        val = nmax + 1;

    if ((val > ind && lst <= ind) || (val <= ind && lst > ind)) {
        divide(x, mij, ind, val);
    } else {
        for (int i = x; i <= mij; ++ i)
            if (viz[i] == 0)
                v[i] ^= 1;
        divide(mij + 1, y, ind, lst);
    }
}

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

        divide(0, N - 1, i, tryCombination(v));
    }

    answer(s, d);
}

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