FilesExpand file tree

 master

/

NQueensII.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

35 lines (31 loc) · 779 Bytes

 master

/

NQueensII.java

Copy path

Top

File metadata and controls

• Code
• Blame

35 lines (31 loc) · 779 Bytes

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

public class NQueensII {

private int total;

public int totalNQueens(int n) {

int[] f = new int[n];

dfs(f, 0);

return total;

}

private void dfs(int[] f, int row) {

if (row == f.length) {

total++;

return;

}

for (int j = 0; j < f.length; j++) {

if (isValid(f, row, j)) {

f[row] = j;

dfs(f, row + 1);

}

}

}

private boolean isValid(int[] f, int row, int col) {

for (int i = 0; i < row; i++) {

if (f[i] == col) {

return false;

}

if (Math.abs(i - row) == Math.abs(f[i] - col)) {

return false;

}

}

return true;

}

}