Submission #740377

#	Time	Username	Problem	Language	Result	Execution time	Memory
740377		GrindMachine	Cave (IOI13_cave)	C++17	0 / 100	230 ms	648 KiB

cave

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "cave.h"

void exploreCave(int n) {
    int s[n], d[n];
    memset(s, 0, sizeof s);
    memset(d, -1, sizeof d);

    rep(door, n) {
        int curr = tryCombination(s);
        assert(curr >= door);

        int l = 0, r = n - 1;
        int pos = -1, typ = -1;

        while (l <= r) {
            int mid = (l + r) >> 1;

            rep(i, mid + 1) {
                if (d[i] == -1) {
                    s[i] ^= 1;
                }
            }

            int res = tryCombination(s);
            if (res == -1) res = n;

            rep(i, mid + 1) {
                if (d[i] == -1) {
                    s[i] ^= 1;
                }
            }

            bool ok = false;

            if (curr == door and res > door) {
                ok = true;
                typ = 0;
            }

            if (curr > door and res == door) {
                ok = true;
                typ = 1;
            }

            if (ok) {
                pos = mid;
                r = mid - 1;
            }
            else {
                l = mid + 1;
            }
        }

        assert(pos != -1);

        if (typ == 0) {
            // door is open after inverting
            s[pos] ^= 1;
        }

        d[pos] = door;
    }

    answer(s, d);
}

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