UsualStructure/Structure/自定义并查集模板.cpp

int f[/*size*/];
void init(int n) {
	for (int i = 1; i <= n; i++)
		f[i] = i;
}
int find(int x) {
	return (f[x] == x) ? x : (f[x] = find(f[x]));
}
void merge(int x, int y) {
	int fx = find(x), fy = find(y);
	f[fx] = fy;
}
bool query(int x, int y) {
	return find(x) == find(y);
}