Binary tree

input/code.cpp: In function 'int main()':
input/code.cpp:61:13: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if (k == 2)
             ^~

#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    int n, m, d, g, k;
    cin >> n >> m;
    long long a, b, D[n], L, R, M, MOD=1000000007;
    vector <long long> A;
    set <long long> Se;
    for (int i = 0; i < m; i++)
    {
        cin >> a;
        if (a <= 3)
        {
            cout << 0;
            return 0;
        }
        A.push_back(a);
    }
    sort(A.begin(),A.end());
    D[0] = 1;
    for (int i = 1; i < n; i++)
    {
        D[i] = D[i-1] * 2;
    }
    L = D[n-2];
    R = D[n-2];
    for (int i = 0; i < m; i++)
    {
        a = A[i];
        b = A[i];
        d = n;
        g = 1;
        while (b > 0)
        {
            if (b == 2)
            {
                k = 2;
            }
            else if (b == 3)
            {
                k = 3;
            }
            b /= 2;
            d--;
        }
        while (g == 1 && a > 0)
        {
            a /= 2;
            if (Se.find(a) != Se.end())
            {
                g = 0;
            }
        }
        if (g == 1)
        {
            Se.insert(A[i]);
            if (k == 2)
            {
                L -= D[d];
            }
            else
            {
                R -= D[d];
            }
        }
    }
    L %= MOD;
    R %= MOD;
    M = (((L*R) % MOD) * 2) % MOD;
    cout << M;
    return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 1

Verdict: ACCEPTED

Test 8

Group: 1

Verdict: ACCEPTED

Test 9

Group: 1

Verdict: ACCEPTED

Test 10

Group: 1

Verdict: ACCEPTED

Test 11

Group: 1

Verdict: ACCEPTED

Test 12

Group: 1

Verdict: ACCEPTED

Test 13

Group: 1

Verdict: ACCEPTED

Test 14

Group: 1

Verdict: ACCEPTED

Test 15

Group: 1

Verdict: ACCEPTED

Test 16

Group: 1

Verdict: ACCEPTED

Test 17

Group: 1

Verdict: ACCEPTED

Test 18

Group: 1

Verdict: ACCEPTED

Test 19

Group: 1

Verdict: ACCEPTED

Test 20

Group: 1

Verdict: ACCEPTED

Test 21

Group: 1

Verdict: ACCEPTED

Test 22

Group: 1

Verdict: ACCEPTED

Test 23

Group: 1

Verdict: ACCEPTED

Test 24

Group: 1

Verdict: ACCEPTED

Test 25

Group: 1

Verdict: ACCEPTED

Test 26

Group: 1

Verdict: ACCEPTED

Test 27

Group: 1

Verdict: ACCEPTED

Test 28

Group: 1

Verdict: ACCEPTED

Test 29

Group: 1

Verdict: ACCEPTED

Test 30

Group: 1

Verdict: ACCEPTED

Test 31

Group: 1

Verdict: ACCEPTED

Test 32

Group: 1

Verdict: ACCEPTED

Test 33

Group: 1

Verdict: ACCEPTED

Test 34

Group: 1

Verdict: ACCEPTED

Test 35

Group: 1

Verdict: ACCEPTED

Test 36

Group: 2

Verdict: ACCEPTED

Test 37

Group: 2

Verdict: ACCEPTED

Test 38

Group: 2

Verdict: ACCEPTED

Test 39

Group: 2

Verdict: ACCEPTED

Test 40

Group: 2

Verdict: ACCEPTED

Test 41

Group: 2

Verdict: ACCEPTED

Test 42

Group: 2

Verdict: ACCEPTED

Test 43

Group: 2

Verdict: ACCEPTED

Test 44

Group: 2

Verdict: ACCEPTED

Test 45

Group: 2

Verdict: ACCEPTED

Test 46

Group: 3

Verdict: ACCEPTED

Test 47

Group: 3

Verdict: ACCEPTED

Test 48

Group: 3

Verdict: ACCEPTED

Test 49

Group: 3

Verdict: ACCEPTED

Test 50

Group: 3

Verdict: ACCEPTED

Test 51

Group: 3

Verdict: ACCEPTED

Test 52

Group: 3

Verdict: ACCEPTED

Test 53

Group: 3

Verdict: ACCEPTED

Test 54

Group: 3

Verdict: ACCEPTED

Test 55

Group: 3

Verdict: ACCEPTED

Test 56

Group: 3

Verdict: ACCEPTED

Test 57

Group: 3

Verdict: ACCEPTED

Test 58

Group: 3

Verdict: ACCEPTED

Test 59

Group: 3

Verdict: ACCEPTED

Test 60

Group: 3

Verdict: ACCEPTED

Test 61

Group: 3

Verdict: ACCEPTED

Test 62

Group: 3

Verdict: ACCEPTED

Test 63

Group: 3

Verdict: ACCEPTED

Test 64

Group: 3

Verdict: ACCEPTED

Test 65

Group: 3

Verdict: ACCEPTED

Test 66

Group: 3

Verdict: ACCEPTED

Test 67

Group: 3

Verdict: ACCEPTED

Test 68

Group: 3

Verdict: ACCEPTED

Test 69

Group: 3

Verdict: ACCEPTED

Test 70

Group: 3

Verdict: ACCEPTED

Test 71

Group: 3

Verdict: ACCEPTED

Test 72

Group: 3

Verdict: ACCEPTED

Test 73

Group: 3

Verdict: ACCEPTED

Test 74

Group: 3

Verdict: ACCEPTED

Test 75

Group: 3

Verdict: ACCEPTED

Test 76

Group: 3

Verdict: ACCEPTED

Test 77

Group: 3

Verdict: ACCEPTED