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36. Valid Sudoku (java) #100

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Nov 8, 2018
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36. Valid Sudoku (java) #100

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14 changes: 14 additions & 0 deletions solution/0036.Valid Sudoku/Solution.java
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Original file line number Diff line number Diff line change
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class Solution {
public boolean isValidSudoku(char[][] board) {
for(int i = 0; i < 9; i++) {
HashSet<Character> col = new HashSet<>() , row = new HashSet<>() , cube = new HashSet<>();
for(int j = 0; j < 9; j++) {
if(board[i][j] != '.' && !row.add(board[i][j])) return false;
if(board[j][i] != '.' && !col.add(board[j][i])) return false;
int colIndex = i/3*3+j/3 , rowIndex = i%3*3+j%3;
if(board[rowIndex][colIndex] != '.' && !cube.add(board[rowIndex][colIndex])) return false;
}
}
return true;
}
}