并查集一定要初始化自己为自己爹吗

好像不初始化判断是否为0也可以啊？还是初始化会对其他题有什么帮助？

#include <iostream>

using namespace std;
int father[10010];
int n, m;

int getf(int x)
{
    if (father[x]) return father[x] = getf(father[x]);
    return x;
}

void merge(int x, int y)
{
    int fx, fy;
    fx = getf(x); fy = getf(y);
    if (fx == fy) return;
    father[fy] = fx;
}

int main()
{
    cin >> n >> m;

    for (int i = 1; i <= m; i++) {
        int z, x, y;
        cin >> z >> x >> y;
        if (z == 1) merge(x, y);
        else {
            if (getf(x) == getf(y)) cout << 'Y' << endl;
            else cout << 'N' << endl;
        }
    }
}