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Refactor: Change loop variable type from int to char for clarity

Updated the loop variable in the DFS function from `int k` to `char k` to improve clarity and maintain consistency with the Sudoku board's data type. This change avoids implicit type conversions and ensures that the code directly represents the intended operations on character data ('1' to '9').

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DFS/037.Sudoku-Solver
- 037.Sudoku-Solver.cpp

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`‎DFS/037.Sudoku-Solver/037.Sudoku-Solver.cpp‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -11,7 +11,7 @@ class Solution {`
`11`	`11`	`if (j==9) return DFS(board, i+1, 0);`
`12`	`12`	`if (board[i][j]!='.') return DFS(board, i, j+1);`
`13`	`13`
`14`		`- for (int k='1'; k<='9'; k++)`
	`14`	`+ for (char k='1'; k<='9'; k++)`
`15`	`15`	`{`
`16`	`16`	`if (!isValid(board, i, j, k)) continue;`
`17`	`17`	`board[i][j]=k;`

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Commit eb61567

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`‎DFS/037.Sudoku-Solver/037.Sudoku-Solver.cpp‎`

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