Submission #311649

#	Time	Username	Problem	Language	Result	Execution time	Memory
311649		saarang123	Cave (IOI13_cave)	C++14	13 / 100	16 ms	512 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"
using namespace std;
using ll = long long;
using ld = long double;

#define all(x) x.begin(), x.end()
#define pb push_back
#define mp make_pair

template<class T> bool remin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool remax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

std::mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
/*
void answer(int s[], int d[]) {
    int n = sizeof(s)/  sizeof(s[0]);
    cout << "Code: ";
    for(int i = 0; i < n; i++) cout << s[i] << " "; cout << endl;
    cout << "Doors: ";
    for(int i = 0; i < n; i++) cout << d[i] << " "; cout << endl;
    cout << "Exit" << endl;
}

int tryCombination(int s[]) {
    size_t n = (2 * sizeof(s) / sizeof(s[0]));
    cout << "Query for doors: " << sizeof(s) << " " << sizeof(s[0]) << endl;
    for(int i = 0; i < n; i++) cout << s[i] << " "; cout << endl;
    int x; cin >> x;
    return x;
}*/

int binsearch(int a[], int k) {
    int n = sizeof(a) / sizeof(a[0]);
    int mn = 0, mx = n - 1;
    while(mn < mx) {
        int mid = (mn + mx) >> 1;
        for(int i = mn; i <= mid; i++)
            a[i] ^= 1;
        int x = tryCombination(a);
        for(int i = mn; i <= mid; i++)
            a[i] ^= 1;
        if(x != k)
            mx = mid;
        else
            mn = mid + 1;
    }
    return mn;
}

void exploreCave(int n) {
    //cout << n << endl;
    int a[n], s[n], d[n];
    for(int i = 0; i < n; i++)
        a[i] = 0, s[i] = 0, d[i] = -1;
    int x = tryCombination(a);
    while(x != -1) {
        int id = binsearch(a, x);
        d[id] = x;
        a[id] ^= 1;
        x = tryCombination(a);
    }
    for(int i = 0; i < n; i++) s[i] = a[i];
    for(int i = 0; i < n; i++) {
        if(d[i] != -1) continue;
        s[i] ^= 1;
        d[i] = tryCombination(s);
        s[i] ^= 1;
    }
    answer(s, d);
}

/*
signed main() {
    std::ios::sync_with_stdio(0);
    std::cout.tie(0);
    std::cin.tie(0);
    int n, i, j;
    cin >> n;
    exploreCave(n);
    return 0;
}*/

Compilation message (stderr)

cave.cpp: In function 'int binsearch(int*, int)':
cave.cpp:34:21: warning: 'sizeof' on array function parameter 'a' will return size of 'int*' [-Wsizeof-array-argument]
   34 |     int n = sizeof(a) / sizeof(a[0]);
      |                     ^
cave.cpp:33:19: note: declared here
   33 | int binsearch(int a[], int k) {
      |               ~~~~^~~

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