g1201_1300.s1222_queens_that_can_attack_the_king

Class Solution

java.lang.Object

g1201_1300.s1222_queens_that_can_attack_the_king.Solution

public class Solution
extends Object

1222 - Queens That Can Attack the King.

Medium

On an 8x8 chessboard, there can be multiple Black Queens and one White King.

Given an array of integer coordinates queens that represents the positions of the Black Queens, and a pair of coordinates king that represent the position of the White King, return the coordinates of all the queens (in any order) that can attack the King.

Example 1:

Input: queens = [[0,1],[1,0],[4,0],[0,4],[3,3],[2,4]], king = [0,0]

Output: 0,1],[1,0],[3,3

Explanation:

The queen at [0,1] can attack the king cause they’re in the same row.

The queen at [1,0] can attack the king cause they’re in the same column.

The queen at [3,3] can attack the king cause they’re in the same diagnal.

The queen at [0,4] can’t attack the king cause it’s blocked by the queen at [0,1].

The queen at [4,0] can’t attack the king cause it’s blocked by the queen at [1,0].

The queen at [2,4] can’t attack the king cause it’s not in the same row/column/diagnal as the king.

Example 2:

Input: queens = [[0,0],[1,1],[2,2],[3,4],[3,5],[4,4],[4,5]], king = [3,3]

Output: 2,2],[3,4],[4,4

Example 3:

Input: queens = [[5,6],[7,7],[2,1],[0,7],[1,6],[5,1],[3,7],[0,3],[4,0],[1,2],[6,3],[5,0],[0,4],[2,2],[1,1],[6,4],[5,4],[0,0],[2,6],[4,5],[5,2],[1,4],[7,5],[2,3],[0,5],[4,2],[1,0],[2,7],[0,1],[4,6],[6,1],[0,6],[4,3],[1,7]], king = [3,4]

Output: 2,3],[1,4],[1,6],[3,7],[4,3],[5,4],[4,5

Constraints:

• 1 <= queens.length <= 63
• queens[i].length == 2
• 0 <= queens[i][j] < 8
• king.length == 2
• 0 <= king[0], king[1] < 8
• At most one piece is allowed in a cell.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
void	dfs(Map<Integer,Set<Integer>> queens, int x, int y, List<List<Integer>> result, String direction)
List<List<Integer>>	queensAttacktheKing(int[][] queens, int[] king)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

queensAttacktheKing

public List<List<Integer>> queensAttacktheKing(int[][] queens,
                                               int[] king)

dfs

public void dfs(Map<Integer,Set<Integer>> queens,
                int x,
                int y,
                List<List<Integer>> result,
                String direction)