add: 220221-CN [csharp]

csharp/Feb22/cn-0221/Program.cs

@@ -1,29 +1,109 @@
 namespace cn_0221;
 
 public class Solution {
-	public static string PushDominoes(string dominoes) {
+	public string PushDominoes(string dominoes) {
 		var q = new Queue<int>();
 
 		var n = dominoes.Length;
+		var result = new int[n];
+		var lastModified = new int[n];
+		
 		for (int i = 0; i < n; ++i) {
 			if ('.' != dominoes[i]) {
 				q.Enqueue(i);
-				q.Enqueue(0);
+				q.Enqueue(1);
+
+				lastModified[i] = 1;
+
+				if (dominoes[i] == 'L') {
+					result[i] = -1;
+				}
+				else { // == 'R'
+					result[i] = 1;
+				}
 			}
 		}
 
-		var result = new int[n];
+		int maxSize = 0, cnt = 0;
-		var lastModified = new int[n];
 		while (q.Count > 0) {
+			++cnt;
+			if (q.Count > maxSize) {
+				maxSize = q.Count;
+			}
+			// every point in queue must be either be altered to L or R
+			// Take one point out of the queue
+			// alter all its affected points
+			// And insert back all affected into queue.
 			var position = q.Dequeue();
 			var timePoint = q.Dequeue();
 
+			if (position > 0 && (lastModified[position - 1] == timePoint + 1 || lastModified[position - 1] == 0) && result[position] < 0) {
+				// L element not affected
+
+				if (lastModified[position - 1] == 0) {
+					q.Enqueue(position - 1);
+					q.Enqueue(timePoint + 1);
 				}
 				
-		return "test";
+				--result[position - 1];
+				lastModified[position - 1] = timePoint + 1;
+			} else if (position < n - 1 && (lastModified[position + 1] == timePoint + 1 || lastModified[position + 1] == 0) && result[position] > 0) {
+
+				if (lastModified[position + 1] == 0) {
+					q.Enqueue(position + 1);
+					q.Enqueue(timePoint + 1);
 				}
 				
+				++result[position + 1];
+				lastModified[position + 1] = timePoint + 1;
+			}
+		}
+
+		string ret = "";
+
+		foreach (int i in result) {
+			if (i < 0)
+				ret += "L";
+			else if (i > 0)
+				ret += "R";
+			else
+				ret += ".";
+		}
+		
+		Console.WriteLine(maxSize);
+		Console.WriteLine(cnt);
+		
+		return ret;
+	}
+}
+
+public class Runner {
 	public static void Main() {
-		// empty
+
+		var r = new Random();
+		
+		string args = "";
+		const int SIZE = 100000;
+		for (int i = 0; i < SIZE; ++i) {
+			switch (r.Next() % 3) {
+				case 0:
+					args += "L";
+					break; 
+				case 1:
+					args += "R";
+					break;
+				case 2:
+					args += ".";
+					break;
+			}
+		}
+		
+		var s = new Solution();
+
+		long start = DateTimeOffset.Now.ToUnixTimeMilliseconds();
+		var ret = s.PushDominoes(args);
+		long end = DateTimeOffset.Now.ToUnixTimeMilliseconds();
+		
+		Console.WriteLine("" + (end - start) + " ms");
 	}
 }