1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n, q;
    cin >> n >> q;

    vector<int> tab(n + 1, 0);
    vector<char> results;

    for (int i = 0; i < q; i++) {
        char a;
        cin >> a;

        if (a == '?') {
            int b;
            cin >> b;
            if (tab[b] == 1)
                results.push_back('1');
            else if (tab[b] == 0)
                results.push_back('0');
            else
                results.push_back('?');
        } else if (a == '+') {
            int m, p;
            cin >> m >> p;
            if(m==p)
                tab[m]=1;
            else if (tab[p] == 1) {
                tab[m] = 1;
            } else if (tab[m] == 1) {
                tab[p] = 1;
            } else if (tab[p] == 0 && tab[m] == 0) {
                tab[p] = 2;
                tab[m] = 2;
            }
            else if(tab[p]==2 && tab[m]==2){
                tab[p]=1;
                tab[m]=1;
            }
            else if(tab[p]==0)
                tab[p]=2;
            else if(tab[m]==0)
                tab[m]=2;
        } else if (a == '-') {
            int b;
            cin >> b;
            tab[b] = 0;
        }
    }

    for (char result : results) {
        cout << result;
    }

    return 0;
}