在乙個 8 x 8 的棋盤上,有乙個白色車(rook)。也可能有空方塊,白色的象(bishop)和黑色的卒(pawn)。它們分別以字元 「r」,「.」,「b」 和 「p」 給出。大寫字元表示白棋,小寫字元表示黑棋。
車按西洋棋中的規則移動:它選擇四個基本方向中的乙個(北,東,西和南),然後朝那個方向移動,直到它選擇停止、到達棋盤的邊緣或移動到同一方格來捕獲該方格上顏色相反的卒。另外,車不能與其他友方(白色)象進入同乙個方格。
返回車能夠在一次移動中捕獲到的卒的數量。
示例 1:
輸入:
[
[".",".",".",".",".",".",".","."],
[".",".",".","p",".",".",".","."],
[".",".",".","r",".",".",".","p"],
[".",".",".",".",".",".",".","."],
[".",".",".",".",".",".",".","."],
[".",".",".","p",".",".",".","."],
[".",".",".",".",".",".",".","."],
[".",".",".",".",".",".",".","."]
]
輸出:3
解釋:在本例中,車能夠捕獲所有的卒。
示例 2:
輸入:
[
[".",".",".",".",".",".",".","."],
[".","p","p","p","p","p",".","."],
[".","p","p","b","p","p",".","."],
[".","p","b","r","b","p",".","."],
[".","p","p","b","p","p",".","."],
[".","p","p","p","p","p",".","."],
[".",".",".",".",".",".",".","."],
[".",".",".",".",".",".",".","."]
]
輸出:0
解釋:象阻止了車捕獲任何卒。
board.length == board[i].length == 8
board[i][j] 可以是 'r','.','b' 或 'p'
只有乙個格仔上存在 board[i][j] == 'r'
四種元素,r(車),b(象),p(卒),.(空)
數量,車1個,其他大於等於0個
在車的豎直或水平方向上,對沒被象擋住的卒進行求和
建立8x8矩陣,定位r座標,掃瞄r的縱軸和橫軸,返回可以直接進行r-p的座標的數量
class solution }}
// 提取r_i行和r_j列
for (int i = r_i - 1; i > -1; --i) else if (board[i][r_j] == '.') else
}for (int i = r_i + 1; i < 8; ++i) else if (board[i][r_j] == '.') else
}for (int j = r_j - 1; j > -1; --j) else if (board[r_i][j] == '.') else
}for (int j = r_j + 1; j < 8; ++j) else if (board[r_i][j] == '.') else
}return count;}};
測試**:
#include #include using namespace std;
class solution }}
// 提取r_i行和r_j列
for (int i = r_i - 1; i > -1; --i) else if (board[i][r_j] == '.') else
}for (int i = r_i + 1; i < 8; ++i) else if (board[i][r_j] == '.') else
}for (int j = r_j - 1; j > -1; --j) else if (board[r_i][j] == '.') else
}for (int j = r_j + 1; j < 8; ++j) else if (board[r_i][j] == '.') else
}return count;
}};int main() ,,,
,,,,
};solution b;
printf("%d\n", b.numrookcaptures(board));
return 0;
}
class solution ; // x軸和y軸的方向陣列控制
int dy[4] = ;
for (int i = 0; i < 8; ++i) }}
// 圈擴散
for (int i = 0; i < 4; ++i) }}
return cnt;}}
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