union find in c++

UnionFind.cpp

class UnionFind {
    public:
    vector<int> parent;
    int getParent(int v) {
        if (parent[v]==v) return v;
        return getParent(parent[v]);
    }
    void unionn(int v, int w) {
        int vp=getParent(v);
        int wp=getParent(w);
        parent[vp]=wp;
    }
    UnionFind(int N) {
        for (int i=0; i<=N; i++) this->parent.push_back(i);
    }
};