Submission #954451

#	Time	Username	Problem	Language	Result	Execution time	Memory
954451		__Davit__	Cave (IOI13_cave)	C++17	13 / 100	24 ms	604 KiB

cave

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

using namespace std;

namespace {
}

void exploreCave(int N) {
    int a[N];
    for (int i = 0; i < N; i++)a[i] = 0;
    int x = tryCombination(a);
    while (x != -1) {
        int ina = 0, inb = N - 1, ans;
        while (ina <= inb) {
            int mid = (ina + inb) >> 1;
            for (int i = 0; i <= mid; i++)a[i] ^= 1;
            int y = tryCombination(a);
            if (x != y) {
                inb = mid - 1;
                ans = mid;
            } else {
                ina = mid + 1;
            }
            for (int i = 0; i <= mid; i++)a[i] ^= 1;
        }
        a[ans] ^= 1;
        x = tryCombination(a);
    }


    int b[N];
    for (int i = 0; i < N; i++) {
        a[i] ^= 1;
        int x = tryCombination(a);
        a[i] ^= 1;
        b[i] = x;
    }
    answer(a, b);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:27:16: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |         a[ans] ^= 1;
      |         ~~~~~~~^~~~

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