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                ```java package ds.impl; import ds.UF; public class DefaultUF implements UF { private int[] parent; private byte[] rank; private int size; public DefaultUF(int n) { if (n < 0) { throw new IllegalArgumentException(); } size = n; parent = new int[n]; rank = new byte[n]; for (int i = 0; i < n; i++) { parent[i] = i; rank[i] = 0; } } @Override public int find(int p) { validate(p, parent.length); while (p != parent[p]) { parent[p] = parent[parent[p]]; p = parent[p]; } return p; } @Override public int size() { return size; } @Override public boolean connected(int p, int q) { return find(p) == find(q); } @Override public void union(int p, int q) { int rootP = find(p); int rootQ = find(q); if (rootP == rootQ) { return; } if (rank[rootP] < rank[rootQ]) { parent[rootP] = rootQ; } else if (rank[rootQ] > rank[rootP]) { parent[rootQ] = rootP; } else { parent[rootQ] = rootP; rank[rootP]++; } size--; } } ```
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