2946. Matrix Similarity After Cyclic Shifts

2946. Matrix Similarity After Cyclic Shifts/2946. Matrix Similarity After Cyclic Shifts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <RootNamespace>_2946._Matrix_Similarity_After_Cyclic_Shifts</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

2946. Matrix Similarity After Cyclic Shifts/Program.cs

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+var sol = new Solution();
+
+var cases = new (int[][] mat, int k, bool expected)[]
+{
+	(
+		new[]
+		{
+			new[] { 1, 2, 3 },
+			new[] { 4, 5, 6 },
+			new[] { 7, 8, 9 }
+		},
+		4,
+		false
+	),
+	(
+		new[]
+		{
+			new[] { 1, 2, 1, 2 },
+			new[] { 5, 5, 5, 5 },
+			new[] { 6, 3, 6, 3 }
+		},
+		2,
+		true
+	),
+	(
+		new[]
+		{
+			new[] { 2, 2 },
+			new[] { 2, 2 }
+		},
+		3,
+		true
+	)
+};
+
+foreach (var (mat, k, expected) in cases)
+{
+	var actual = sol.AreSimilar(mat, k);
+	Console.WriteLine($"mat = {FormatMatrix(mat)}, k = {k} -> {actual} (expected: {expected})");
+}
+
+static string FormatMatrix(int[][] mat)
+{
+	var rows = mat.Select(row => $"[{string.Join(",", row)}]");
+	return $"[{string.Join(",", rows)}]";
+}

2946. Matrix Similarity After Cyclic Shifts/Solution.cs

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+public class Solution
+{
+    public bool AreSimilar(int[][] mat, int k)
+    {
+        var answer = true;
+        var shift = -k;
+        for (var i = 0; i < mat.Length; i++)
+        {
+            var len = mat[i].Length;
+            for (var j = 0; j < len; j++)
+            {
+                var idx = ((j + shift) % len + len) % len;
+                answer &= mat[i][j] == mat[i][idx];
+            }
+            shift = -shift;
+        }
+        return answer;
+    }
+}