Submission #1221161

#	Time	Username	Problem	Language	Result	Execution time	Memory
1221161		FaresSTH	Cave (IOI13_cave)	C++20	0 / 100	40 ms	324 KiB

cave

#include "bits/stdc++.h"
#include "cave.h"
using namespace std;

void exploreCave(int n) {
    vector<bool> v(n, false);
    vector<int> s(n, 0), d(n, 0);

    int in = tryCombination(s.data());  // initial combination score

    for (int i = 0; i < n; i++) {
        int l = 0, r = n - 1;

        while (l < r) {
            int m = (l + r) / 2;
            // Flip bits in s from l to m if not visited
            for (int j = l; j <= m; j++) {
                if (!v[j]) s[j] = 1 - s[j];
            }

            int cur = tryCombination(s.data());

            // Revert flip
            for (int j = l; j <= m; j++) {
                if (!v[j]) s[j] = 1 - s[j];
            }

            if (in != cur) {
                r = m;
            } else {
                l = m + 1;
            }
        }

        // After binary search, flip s[l] if needed
        for (int j = l; j <= l; j++) {
            if (!v[j]) s[j] = 1 - s[j];
        }

        d[i] = l;
        v[l] = true;

        in = tryCombination(s.data());  // update in after flip
    }

    answer(s.data(), d.data());
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24