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Commit2d279dc

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sudoku
1 parentf5bc05b commit2d279dc

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‎hash/SolveSudoku.java

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packageAlgorithms.hash;
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publicclassSolveSudoku {
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publicvoidsolveSudoku(char[][]board) {
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dfs(board,0,0);
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}
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publicbooleandfs(char[][]board,intx,inty) {
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// go to next row.
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if (y ==9) {
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y =0;
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x++;
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}
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// done
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if (x >=9) {
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returntrue;
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}
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// Skip the solved point.
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if (board[x][y] !='.') {
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returndfs(board,x,y +1);
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}
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// Go throught all the possibilities.
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for (intk =0;k <9;k++) {
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board[x][y] = (char)('1' +k);
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// SHOULD RETURN HERE IF INVALID.
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if (isValid(board,x,y) &&dfs(board,x,y +1)) {
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returntrue;
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}
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board[x][y] ='.';
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}
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// because all the possibility is impossiable.
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returnfalse;
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}
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publicbooleanisValid(char[][]board,intx,inty) {
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// Judge the column.
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for (inti =0;i <9;i++) {
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if (i !=x &&board[i][y] ==board[x][y]) {
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returnfalse;
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}
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}
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// Judge the row.
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for (inti =0;i <9;i++) {
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if (i !=y &&board[x][i] ==board[x][y]) {
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returnfalse;
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}
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}
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// Judge the block.
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inti =x /3 *3;
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intj =y /3 *3;
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for (intk =0;k <9;k++) {
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intxIndex =i +k /3;
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intyIndex =j +k %3;
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if (xIndex ==x &&yIndex ==y) {
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continue;
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}
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if (board[xIndex][yIndex] ==board[x][y]) {
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returnfalse;
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}
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}
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returntrue;
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}
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}

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