# 1222. Queens That Can Attack the King 可以攻击国王的皇后

@TOC

## # 题目描述

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. `1 <= queens.length <= 63`
2. `queens[0].length == 2`
3. `0 <= queens[i][j] < 8`
4. `king.length == 2`
5. `0 <= king[0], king[1] < 8`
6. At most one piece is allowed in a cell.

## # 解题方法

### # 遍历

C++代码如下：

``````class Solution {
public:
vector<vector<int>> queensAttacktheKing(vector<vector<int>>& queens, vector<int>& king) {
set<vector<int>> s(queens.begin(), queens.end());
vector<vector<int>> res;
for (auto& dir : dirs) {
vector<int> pos = king;
while (true) {
pos[0] += dir[0];
pos[1] += dir[1];
if (pos[0] < 0 || pos[0] >= 8 || pos[1] < 0 || pos[1] >= 8)
break;
if (s.count(pos)) {
res.push_back(pos);
break;
}
}
}
return res;
}
private:
vector<vector<int>> dirs = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}, {1, 1}, {1, -1}, {-1, 1}, {-1, -1}};
};
``````

## # 日期

2019 年 10 月 13 日 —— 国庆调休，这周末只有这一天假