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Commit 3337bf3

Browse files
feat: add php solution to lc problems: No.0036-0040 (doocs#2539)
1 parent ce9f63c commit 3337bf3

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15 files changed

+689
-0
lines changed

15 files changed

+689
-0
lines changed

‎solution/0000-0099/0036.Valid Sudoku/README.md‎

Lines changed: 42 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -240,6 +240,48 @@ var isValidSudoku = function (board) {
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};
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```
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243+
```php
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class Solution {
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/**
246+
* @param string[][] $board
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* @return boolean
248+
*/
249+
250+
function isValidSudoku($board) {
251+
$rows = [];
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$columns = [];
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$boxes = [];
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255+
for ($i = 0; $i < 9; $i++) {
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$rows[$i] = [];
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$columns[$i] = [];
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$boxes[$i] = [];
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}
260+
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for ($row = 0; $row < 9; $row++) {
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for ($column = 0; $column < 9; $column++) {
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$cell = $board[$row][$column];
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if ($cell != '.') {
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if (
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in_array($cell, $rows[$row]) ||
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in_array($cell, $columns[$column]) ||
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in_array($cell, $boxes[floor($row / 3) * 3 + floor($column / 3)])
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) {
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return false;
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}
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$rows[$row][] = $cell;
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$columns[$column][] = $cell;
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$boxes[floor($row / 3) * 3 + floor($column / 3)][] = $cell;
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}
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}
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}
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return true;
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}
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}
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```
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243285
<!-- tabs:end -->
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<!-- end -->

‎solution/0000-0099/0036.Valid Sudoku/README_EN.md‎

Lines changed: 42 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -234,6 +234,48 @@ var isValidSudoku = function (board) {
234234
};
235235
```
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237+
```php
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class Solution {
239+
/**
240+
* @param string[][] $board
241+
* @return boolean
242+
*/
243+
244+
function isValidSudoku($board) {
245+
$rows = [];
246+
$columns = [];
247+
$boxes = [];
248+
249+
for ($i = 0; $i < 9; $i++) {
250+
$rows[$i] = [];
251+
$columns[$i] = [];
252+
$boxes[$i] = [];
253+
}
254+
255+
for ($row = 0; $row < 9; $row++) {
256+
for ($column = 0; $column < 9; $column++) {
257+
$cell = $board[$row][$column];
258+
259+
if ($cell != '.') {
260+
if (
261+
in_array($cell, $rows[$row]) ||
262+
in_array($cell, $columns[$column]) ||
263+
in_array($cell, $boxes[floor($row / 3) * 3 + floor($column / 3)])
264+
) {
265+
return false;
266+
}
267+
268+
$rows[$row][] = $cell;
269+
$columns[$column][] = $cell;
270+
$boxes[floor($row / 3) * 3 + floor($column / 3)][] = $cell;
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}
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}
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}
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return true;
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}
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}
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```
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237279
<!-- tabs:end -->
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239281
<!-- end -->
Lines changed: 35 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,35 @@
1+
class Solution {
2+
/**
3+
* @param string[][] $board
4+
* @return boolean
5+
*/
6+
7+
function isValidSudoku($board) {
8+
$rows = [];
9+
$columns = [];
10+
$boxes = [];
11+
12+
for ($i = 0; $i < 9; $i++) {
13+
$rows[$i] = [];
14+
$columns[$i] = [];
15+
$boxes[$i] = [];
16+
}
17+
18+
for ($row = 0; $row < 9; $row++) {
19+
for ($column = 0; $column < 9; $column++) {
20+
$cell = $board[$row][$column];
21+
22+
if ($cell != '.') {
23+
if (in_array($cell, $rows[$row]) || in_array($cell, $columns[$column]) || in_array($cell, $boxes[floor($row / 3) * 3 + floor($column / 3)])) {
24+
return false;
25+
}
26+
27+
$rows[$row][] = $cell;
28+
$columns[$column][] = $cell;
29+
$boxes[floor($row / 3) * 3 + floor($column / 3)][] = $cell;
30+
}
31+
}
32+
}
33+
return true;
34+
}
35+
}

‎solution/0000-0099/0037.Sudoku Solver/README.md‎

Lines changed: 78 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -356,6 +356,84 @@ public class Solution {
356356
}
357357
```
358358

359+
```php
360+
class Solution {
361+
/**
362+
* @param string[][] $board
363+
* @return bool
364+
*/
365+
366+
public function solveSudoku(&$board) {
367+
if (isSolved($board)) {
368+
return true;
369+
}
370+
371+
$emptyCell = findEmptyCell($board);
372+
$row = $emptyCell[0];
373+
$col = $emptyCell[1];
374+
375+
for ($num = 1; $num <= 9; $num++) {
376+
if (isValid($board, $row, $col, $num)) {
377+
$board[$row][$col] = (string) $num;
378+
if ($this->solveSudoku($board)) {
379+
return true;
380+
}
381+
$board[$row][$col] = '.';
382+
}
383+
}
384+
return false;
385+
}
386+
}
387+
388+
function isSolved($board) {
389+
foreach ($board as $row) {
390+
if (in_array('.', $row)) {
391+
return false;
392+
}
393+
}
394+
return true;
395+
}
396+
397+
function findEmptyCell($board) {
398+
for ($row = 0; $row < 9; $row++) {
399+
for ($col = 0; $col < 9; $col++) {
400+
if ($board[$row][$col] === '.') {
401+
return [$row, $col];
402+
}
403+
}
404+
}
405+
406+
return null;
407+
}
408+
409+
function isValid($board, $row, $col, $num) {
410+
for ($i = 0; $i < 9; $i++) {
411+
if ($board[$row][$i] == $num) {
412+
return false;
413+
}
414+
}
415+
416+
for ($i = 0; $i < 9; $i++) {
417+
if ($board[$i][$col] == $num) {
418+
return false;
419+
}
420+
}
421+
422+
$startRow = floor($row / 3) * 3;
423+
$endCol = floor($col / 3) * 3;
424+
425+
for ($i = 0; $i < 3; $i++) {
426+
for ($j = 0; $j < 3; $j++) {
427+
if ($board[$startRow + $i][$endCol + $j] == $num) {
428+
return false;
429+
}
430+
}
431+
}
432+
433+
return true;
434+
}
435+
```
436+
359437
<!-- tabs:end -->
360438

361439
<!-- end -->

‎solution/0000-0099/0037.Sudoku Solver/README_EN.md‎

Lines changed: 78 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -346,6 +346,84 @@ public class Solution {
346346
}
347347
```
348348

349+
```php
350+
class Solution {
351+
/**
352+
* @param string[][] $board
353+
* @return bool
354+
*/
355+
356+
public function solveSudoku(&$board) {
357+
if (isSolved($board)) {
358+
return true;
359+
}
360+
361+
$emptyCell = findEmptyCell($board);
362+
$row = $emptyCell[0];
363+
$col = $emptyCell[1];
364+
365+
for ($num = 1; $num <= 9; $num++) {
366+
if (isValid($board, $row, $col, $num)) {
367+
$board[$row][$col] = (string) $num;
368+
if ($this->solveSudoku($board)) {
369+
return true;
370+
}
371+
$board[$row][$col] = '.';
372+
}
373+
}
374+
return false;
375+
}
376+
}
377+
378+
function isSolved($board) {
379+
foreach ($board as $row) {
380+
if (in_array('.', $row)) {
381+
return false;
382+
}
383+
}
384+
return true;
385+
}
386+
387+
function findEmptyCell($board) {
388+
for ($row = 0; $row < 9; $row++) {
389+
for ($col = 0; $col < 9; $col++) {
390+
if ($board[$row][$col] === '.') {
391+
return [$row, $col];
392+
}
393+
}
394+
}
395+
396+
return null;
397+
}
398+
399+
function isValid($board, $row, $col, $num) {
400+
for ($i = 0; $i < 9; $i++) {
401+
if ($board[$row][$i] == $num) {
402+
return false;
403+
}
404+
}
405+
406+
for ($i = 0; $i < 9; $i++) {
407+
if ($board[$i][$col] == $num) {
408+
return false;
409+
}
410+
}
411+
412+
$startRow = floor($row / 3) * 3;
413+
$endCol = floor($col / 3) * 3;
414+
415+
for ($i = 0; $i < 3; $i++) {
416+
for ($j = 0; $j < 3; $j++) {
417+
if ($board[$startRow + $i][$endCol + $j] == $num) {
418+
return false;
419+
}
420+
}
421+
}
422+
423+
return true;
424+
}
425+
```
426+
349427
<!-- tabs:end -->
350428

351429
<!-- end -->
Lines changed: 75 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,75 @@
1+
class Solution {
2+
/**
3+
* @param string[][] $board
4+
* @return bool
5+
*/
6+
7+
public function solveSudoku(&$board) {
8+
if (isSolved($board)) {
9+
return true;
10+
}
11+
12+
$emptyCell = findEmptyCell($board);
13+
$row = $emptyCell[0];
14+
$col = $emptyCell[1];
15+
16+
for ($num = 1; $num <= 9; $num++) {
17+
if (isValid($board, $row, $col, $num)) {
18+
$board[$row][$col] = (string) $num;
19+
if ($this->solveSudoku($board)) {
20+
return true;
21+
}
22+
$board[$row][$col] = '.';
23+
}
24+
}
25+
return false;
26+
}
27+
}
28+
29+
function isSolved($board) {
30+
foreach ($board as $row) {
31+
if (in_array('.', $row)) {
32+
return false;
33+
}
34+
}
35+
return true;
36+
}
37+
38+
function findEmptyCell($board) {
39+
for ($row = 0; $row < 9; $row++) {
40+
for ($col = 0; $col < 9; $col++) {
41+
if ($board[$row][$col] === '.') {
42+
return [$row, $col];
43+
}
44+
}
45+
}
46+
47+
return null;
48+
}
49+
50+
function isValid($board, $row, $col, $num) {
51+
for ($i = 0; $i < 9; $i++) {
52+
if ($board[$row][$i] == $num) {
53+
return false;
54+
}
55+
}
56+
57+
for ($i = 0; $i < 9; $i++) {
58+
if ($board[$i][$col] == $num) {
59+
return false;
60+
}
61+
}
62+
63+
$startRow = floor($row / 3) * 3;
64+
$endCol = floor($col / 3) * 3;
65+
66+
for ($i = 0; $i < 3; $i++) {
67+
for ($j = 0; $j < 3; $j++) {
68+
if ($board[$startRow + $i][$endCol + $j] == $num) {
69+
return false;
70+
}
71+
}
72+
}
73+
74+
return true;
75+
}

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