Submission #252326

#	Time	Username	Problem	Language	Result	Execution time	Memory
252326		paradox	Cave (IOI13_cave)	C++17	100 / 100	1309 ms	512 KiB

cave

#include "cave.h"

#include <iostream>
#include <fstream>
#include <vector>
#include <set>
#include <map>
#include <cstring>
#include <string>
#include <cmath>
#include <cassert>
#include <ctime>
#include <algorithm>
#include <sstream>
#include <list>
#include <queue>
#include <deque>
#include <stack>
#include <cstdlib>
#include <cstdio>
#include <iterator>
#include <functional>
#include <unordered_set>
#include <unordered_map>
#include <stdio.h>
#include <bitset>
using namespace std;
 
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define pii pair<int, int>
#define vi vector<int>
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
 
typedef long long ll;
typedef short inth;
 
const int N = 5e3;
const int M = N + 7;
const int MOD = 1e9 + 7;
const ll INF = 1e16 + 17;

bool fx[M];

void fill(int l, int sz, int val, int n, int *sw) {
    for (int i = 0; i < n; ++i) {
        if (fx[i])
            continue;
        sw[i] = val ^ 1;
        if (l == 0 && sz) {
            sw[i] = val;
            --sz;
        } else {
            --l;
        }
    }
}

void exploreCave(int n) {
    int sw[n], door[n];
    for (int i = 0; i < n; ++i)
        sw[i] = door[i] = 0;
    for (int i = 0; i < n; ++i) {
        fill(0, n - i, 0, n, sw);
        int res = tryCombination(sw);

        int appVal = 0;
        if (res == i)
            appVal = 1;

        int l = 0, r = n - i - 1;
        while (l != r) {
            int mid = (l + r) >> 1;
            fill(l, mid - l + 1, appVal, n, sw);
            int res = tryCombination(sw);
            if (res == i) {
                l = mid + 1;
            } else {
                r = mid;
            }
        }

        for (int j = 0; j < n; ++j) {
            if (fx[j])
                continue;
            if (!l) {
                fx[j] = true;
                sw[j] = appVal;
                door[j] = i;
                break;
            }
            --l;
        }
    }
    answer(sw, door);
}

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