Minor refactor

Day4/Program.cs

@@ -14,7 +14,7 @@ int FindMas(char[,] grid)
     var rows = grid.GetLength(0);
     var cols = grid.GetLength(1);
 
-    var directions = new[,]
+    var searchDirections = new[,]
     {
         { -1, 1 }, // diagonal up right
         { 1, 1 }, // diagonal down right
@@ -24,13 +24,13 @@ int FindMas(char[,] grid)
 
     List<string> masCenterCoordinates = new();
 
-    for (var r = 0; r < rows; r++)
+    for (var row = 0; row < rows; row++)
     {
-        for (var c = 0; c < cols; c++)
+        for (var column = 0; column < cols; column++)
         {
-            for (var d = 0; d < directions.GetLength(0); d++)
+            for (var direction = 0; direction < searchDirections.GetLength(0); direction++)
             {
-                var masCoordinates = CheckWord(r, c, directions[d, 0], directions[d, 1], grid, "MAS");
+                var masCoordinates = CheckWord(row, column, searchDirections[direction, 0], searchDirections[direction, 1], grid, "MAS");
                 if (masCoordinates != null)
                 {
                     masCenterCoordinates.Add($"{masCoordinates[1][0]},{masCoordinates[1][1]}");
@@ -50,7 +50,7 @@ int FindXmas(char[,] grid)
     var cols = grid.GetLength(1);
     var xmasCount = 0;
 
-    var directions = new[,]
+    var searchDirections = new[,]
     {
         { -1, 0 }, // up
         { 0, 1 }, // right
@@ -62,13 +62,13 @@ int FindXmas(char[,] grid)
         { 1, -1 } // diagonal down left
     };
 
-    for (var r = 0; r < rows; r++)
+    for (var row = 0; row < rows; row++)
     {
-        for (var c = 0; c < cols; c++)
+        for (var column = 0; column < cols; column++)
         {
-            for (var d = 0; d < directions.GetLength(0); d++)
+            for (var direction = 0; direction < searchDirections.GetLength(0); direction++)
             {
-                if (CheckWord(r, c, directions[d, 0], directions[d, 1], grid, "XMAS") != null)
+                if (CheckWord(row, column, searchDirections[direction, 0], searchDirections[direction, 1], grid, "XMAS") != null)
                 {
                     xmasCount++;
                 }
@@ -79,20 +79,20 @@ int FindXmas(char[,] grid)
     return xmasCount;
 }
 
-List<int[]>? CheckWord(int r, int c, int dr, int dc, char[,] grid, string word)
+List<int[]>? CheckWord(int row, int column, int directionRow, int directionColumn, char[,] grid, string word)
 {
     var characterCoordinates = new List<int[]>();
 
     for (var i = 0; i < word.Length; i++)
     {
-        var newR = r + i * dr;
+        var newRow = row + i * directionRow;
-        var newC = c + i * dc;
+        var newColumn = column + i * directionColumn;
-        if (!IsValid(newR, newC, grid) || grid[newR, newC] != word[i]) return null;
+        if (!IsValid(newRow, newColumn, grid) || grid[newRow, newColumn] != word[i]) return null;
 
-        characterCoordinates.Add([newR, newC]);
+        characterCoordinates.Add([newRow, newColumn]);
     }
 
     return characterCoordinates;
 }
 
-bool IsValid(int r, int c, char[,] grid) => r >= 0 && r < grid.GetLength(0) && c >= 0 && c < grid.GetLength(1);
+bool IsValid(int row, int column, char[,] grid) => row >= 0 && row < grid.GetLength(0) && column >= 0 && column < grid.GetLength(1);