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36.java
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36.java
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__________________________________________________________________________________________________
1ms
class Solution {
public boolean isValidSudoku(char[][] board) {
for (int i = 0; i < 9; i++) {
if (!isValidRow(board, i) || !isValidCol(board, i)) {
return false;
}
}
for (int i = 0; i < 9; i += 3) {
for (int j = 0; j < 9; j += 3) {
if (!isValidSubBox(board, i, j)) {
return false;
}
}
}
return true;
}
public boolean isValidRow(char[][] board, int row) {
boolean[] seenNums = new boolean[10];
for (int i = 0; i < 9; i++) {
char cellVal = board[row][i];
if (cellVal != '.') {
if (seenNums[cellVal - '0']) {
return false;
}
seenNums[cellVal - '0'] = true;
}
}
return true;
}
public boolean isValidCol(char[][] board, int col) {
boolean[] seenNums = new boolean[10];
for (int i = 0; i < 9; i++) {
char cellVal = board[i][col];
if (cellVal != '.') {
if (seenNums[cellVal - '0']) {
return false;
}
seenNums[cellVal - '0'] = true;
}
}
return true;
}
public boolean isValidSubBox(char[][] board, int row, int col) {
boolean[] seenNums = new boolean[10];
for (int i = row; i < row + 3; i++) {
for (int j = col; j < col + 3; j++) {
char cellVal = board[i][j];
if (cellVal != '.') {
if (seenNums[cellVal - '0']) {
return false;
}
seenNums[cellVal - '0'] = true;
}
}
}
return true;
}
}
__________________________________________________________________________________________________
2ms
class Solution {
public boolean isValidSudoku(char[][] board) {
int[] digits = new int[10];
for (char[] b: board) {
digits = new int[10];
for (char ch: b) {
if (ch != '.') {
if (ch < '0' || ch > '9' || digits[ch-'0'] > 0) return false;
digits[ch-'0']++;
}
}
}
for (int c = 0; c < 9; c++) {
digits = new int[10];
for (int r = 0; r < 9; r++) {
if (board[r][c] != '.') {
if (board[r][c] < '0' || board[r][c] > '9' || digits[board[r][c]-'0'] > 0) return false;
digits[board[r][c]-'0']++;
}
}
}
for (int r = 0; r < 9; r+=3) {
for (int c = 0; c < 9; c+=3) {
digits = new int[10];
for (int s1 = r; s1 < r+3; s1++) {
for (int s2 = c; s2 < c+3; s2++) {
if (board[s1][s2] != '.') {
if (board[s1][s2] < '0' || board[s1][s2] > '9' || digits[board[s1][s2]-'0'] > 0) return false;
digits[board[s1][s2]-'0']++;
}
}
}
}
}
return true;
}
}
__________________________________________________________________________________________________
3ms
class Solution {
public boolean isValidSudoku(char[][] board) {
Set<Character> set = null;
Set<Character> set2 = null;
Set<Character> set3 = null;
for(int i = 0; i < 9; i++){
set = new HashSet<>();
set2 = new HashSet<>();
for(int j = 0; j < 9; j++){
if(board[i][j] != '.' && !set.add(board[i][j])){
return false;
}
if(board[j][i] != '.' && !set2.add(board[j][i])){
return false;
}
}
}
for(int i = 0; i < 9; i += 3){
for(int j = 0; j < 9; j += 3){
set3 = new HashSet<>();
if(board[i][j] != '.' && !set3.add(board[i][j])){
return false;
}
if(board[i+1][j] != '.' && !set3.add(board[i+1][j])){
return false;
}
if(board[i+2][j] != '.' && !set3.add(board[i+2][j])){
return false;
}
if(board[i][j+1] != '.' && !set3.add(board[i][j+1])){
return false;
}
if(board[i+1][j+1] != '.' && !set3.add(board[i+1][j+1])){
return false;
}
if(board[i+2][j+1] != '.' && !set3.add(board[i+2][j+1])){
return false;
}
if(board[i][j+2] != '.' && !set3.add(board[i][j+2])){
return false;
}
if(board[i+1][j+2] != '.' && !set3.add(board[i+1][j+2])){
return false;
}
if(board[i+2][j+2] != '.' && !set3.add(board[i+2][j+2])){
return false;
}
}
}
return true;
}
}
__________________________________________________________________________________________________
36820 kb
class Solution {
public boolean isValidSudoku(char[][] board) {
if(board == null || board.length != 9 || board[0].length != 9)
return false;
Set<String> setSeen = new HashSet<>();
for(int i = 0; i<9; i++){
for(int j = 0; j<9; j++){
if(board[i][j] != '.'){
if(!setSeen.add(new String(board[i][j] +"in row" + i))||
!setSeen.add(new String(board[i][j] +"in col" + j))||
!setSeen.add(new String(board[i][j] +"in cube" + i/3 + "and" +j/3))){
return false;
}
}
}
}
return true;
}
}
__________________________________________________________________________________________________
37336 kb
class Solution {
public boolean isValidSudoku(char[][] board) {
Set seen = new HashSet();
for (int i=0; i<9; ++i) {
for (int j=0; j<9; ++j) {
char number = board[i][j];
if (number != '.')
if (!seen.add(number + " in row " + i) ||
!seen.add(number + " in column " + j) ||
!seen.add(number + " in block " + i/3 + "-" + j/3))
return false;
}
}
return true;
}
}
__________________________________________________________________________________________________