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36-valid-sudoku/36-valid-sudoku.c

@@ -0,0 +1,27 @@
+bool isValidSudoku(char** board, int boardSize, int* boardColSize){
+    bool rowFilter[9][9] = {};
+    bool colFilter[9][9] = {};
+    bool boxFilter[9][9] = {};
+    
+    for (int row = 0; row < boardSize; ++row) {
+        for (int col = 0; col < boardColSize[row]; ++col) {
+            int box = ((int) (row / 3)) * 3 + ((int) (col / 3));
+            int val = board[row][col] - '0' - 1;
+            
+            if (val == ('.' - '0' - 1)) {
+                continue;
+            }
+            
+            if (rowFilter[row][val] || colFilter[col][val] || boxFilter[box][val]) {
+                return false;
+            }
+            
+            rowFilter[row][val] = true;
+            colFilter[col][val] = true;
+            boxFilter[box][val] = true;
+            
+        }
+    }
+    
+    return true;
+}