feat: initial commit

2026-01-01 03:40:41 +08:00
commit 631f8ed771
98 changed files with 14776 additions and 0 deletions
@@ -0,0 +1,33 @@
+namespace MaigoLabs.NeedLe.Indexer.Han;
+
+public class UnionFindSet
+{
+    private Dictionary<int, int> Parent { get; set; } = [];
+    private Dictionary<int, int> Rank { get; set; } = [];
+
+    public IEnumerable<int> Keys => Parent.Keys;
+
+    public int Find(int x)
+    {
+        if (!Parent.TryGetValue(x, out var parent)) return Parent[x] = x;
+        else if (x == parent) return x;
+        else return Parent[x] = Find(parent);
+    }
+
+    public void Union(int x, int y)
+    {
+        x = Find(x);
+        y = Find(y);
+        if (x == y) return;
+        int rankX = GetRank(x), rankY = GetRank(y);
+        if (rankX < rankY) Parent[x] = y;
+        else if (rankX > rankY) Parent[y] = x;
+        else
+        {
+            Parent[y] = x;
+            Rank[x] = rankX + 1;
+        }
+    }
+
+    private int GetRank(int x) => !Rank.TryGetValue(x, out var rank) ? 0 : rank;
+}