competitive-programming/(CODEFORCES)web_of_lies.cpp at master · nipolki09/competitive-programming · GitHub

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#include<bits/stdc++.h>

using namespace std;

int die[2001007];

int main() {

    int n, m, q, ans;
    cin >> n >> m;

    ans = n;

    for(int i = 1; i <= m; i++) {
        int a, b;
        cin >> a >> b;

        if(a < b) swap(a, b);
        die[b]++;
        if(die[b] == 1) ans--;
    }

    cin >> q;
    for(int i = 1; i <= q; i++) {
        int a, b, c;
        cin >> a;
        switch(a) {
            case 3 : {
                cout << ans << endl;
                break;
            }
            case 1 : {
                cin >> b >> c;
                if(c > b) {
                    swap(b, c);

                }
                die[c]++;
                    if(die[c] == 1) ans--;
                break;
            }
            case 2 : {
                cin >> b >> c;
                if(c > b) {
                    swap(b, c);

                }
                die[c]--;
                    if(die[c] == 0) ans++;
                break;
            }
        }
    }
    return 0;
}