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Commitf5bc05b

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valid
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‎hash/IsValidSudoku.java

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packageAlgorithms.hash;
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importjava.util.HashSet;
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publicclassIsValidSudoku {
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publicstaticvoidmain(String[]strs) {
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}
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publicstaticbooleanisValidSudoku(char[][]board) {
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if (board ==null ||board.length !=9 ||
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board[0].length !=9) {
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returnfalse;
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}
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HashSet<Character>set =newHashSet<Character>();
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// check the rows.
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for (inti =0;i <9;i++) {
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// clear the set at every row.
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set.clear();
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for (intj =0;j <9;j++) {
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if (!isValidChar(board[i][j],set)) {
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returnfalse;
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}
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}
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}
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// check the columns.
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for (inti =0;i <9;i++) {
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// clear the set at every column.
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set.clear();
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for (intj =0;j <9;j++) {
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if (!isValidChar(board[j][i],set)) {
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returnfalse;
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}
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}
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}
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// check the blocks.
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for (inti =0;i <3;i++) {
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for (intj =0;j <3;j++) {
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// clear the set at every block.
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set.clear();
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for (intk =0;k <9;k++) {
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if (!isValidChar(board[i +k /3][j +k %3],set)) {
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returnfalse;
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}
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}
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}
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}
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returntrue;
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}
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publicstaticbooleanisValidChar(charc,HashSet<Character>set) {
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if (c =='.') {
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returntrue;
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}
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if (c <'0' ||c >'9') {
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returnfalse;
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}
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// Check if the character exit in the hashset.
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if (set.contains(c)) {
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returnfalse;
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}
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set.add(c);
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returntrue;
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}
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}

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