|
1
|
|
|
const visitedPosition = (col, row, result) => { |
|
2
|
|
|
return (result[row] !== undefined && result[row][(col)] !== undefined); |
|
3
|
|
|
} |
|
4
|
|
|
|
|
5
|
|
|
const spiral = (num, val = 1, col = 0, row = 0, horizontal = true, result = [ |
|
6
|
|
|
[] |
|
7
|
|
|
]) => { |
|
8
|
|
|
// put your code here to address problems |
|
9
|
|
|
if (num < 1) { |
|
10
|
|
|
return [ |
|
11
|
|
|
[] |
|
12
|
|
|
]; |
|
13
|
|
|
} |
|
14
|
|
|
|
|
15
|
|
|
if (!result[row]) { |
|
16
|
|
|
result[row] = []; |
|
17
|
|
|
} |
|
18
|
|
|
|
|
19
|
|
|
result[row][col] = val; |
|
20
|
|
|
if (val === Math.pow(num, 2)) { |
|
21
|
|
|
return result; |
|
22
|
|
|
} |
|
23
|
|
|
if (horizontal) { |
|
24
|
|
|
if ((col + 1) < num && !visitedPosition(col + 1, row, result)) { |
|
25
|
|
|
// go right |
|
26
|
|
|
return spiral(num, val + 1, col + 1, row, true, result); |
|
27
|
|
|
} |
|
28
|
|
|
if ((col - 1) >= 0 && !visitedPosition(col - 1, row, result)) { |
|
29
|
|
|
// go left |
|
30
|
|
|
return spiral(num, val + 1, col - 1, row, true, result); |
|
31
|
|
|
} |
|
32
|
|
|
if ((row + 1) < num && !visitedPosition(col, row + 1, result)) { |
|
33
|
|
|
// go down |
|
34
|
|
|
return spiral(num, val + 1, col, row + 1, false, result); |
|
35
|
|
|
} |
|
36
|
|
|
// go up |
|
37
|
|
|
return spiral(num, val + 1, col, row - 1, false, result); |
|
38
|
|
|
|
|
39
|
|
|
} |
|
40
|
|
|
|
|
41
|
|
|
if ((row + 1) < num && !visitedPosition(col, row + 1, result)) { |
|
42
|
|
|
// go down |
|
43
|
|
|
return spiral(num, val + 1, col, row + 1, false, result); |
|
44
|
|
|
} |
|
45
|
|
|
if ((row - 1) >= 0 && !visitedPosition(col, row - 1, result)) { |
|
46
|
|
|
// go up |
|
47
|
|
|
return spiral(num, val + 1, col, row - 1, false, result); |
|
48
|
|
|
} |
|
49
|
|
|
if ((col + 1) < num && !visitedPosition(col + 1, row, result)) { |
|
50
|
|
|
// go right |
|
51
|
|
|
return spiral(num, val + 1, col + 1, row, true, result); |
|
52
|
|
|
} |
|
53
|
|
|
// go left |
|
54
|
|
|
return spiral(num, val + 1, col - 1, row, true, result); |
|
55
|
|
|
} |
|
56
|
|
|
|
|
57
|
|
|
const spiral2 = num => { |
|
58
|
|
|
let result = [], |
|
59
|
|
|
startCol = 0, |
|
60
|
|
|
endCol = num - 1, |
|
61
|
|
|
startRow = 0, |
|
62
|
|
|
endRow = num - 1, |
|
63
|
|
|
counter = 1; |
|
64
|
|
|
if (num < 1) { |
|
65
|
|
|
return [ |
|
66
|
|
|
[] |
|
67
|
|
|
]; |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
|
|
for (let i = 0; i < num; i++) { |
|
71
|
|
|
result.push([]); |
|
72
|
|
|
} |
|
73
|
|
|
|
|
74
|
|
|
while (startCol <= endCol && startRow <= endRow) { |
|
75
|
|
|
// go right |
|
76
|
|
|
for (let i = startCol; i <= endCol; i++) { |
|
77
|
|
|
result[startRow][i] = counter++; |
|
78
|
|
|
} |
|
79
|
|
|
startRow++; |
|
80
|
|
|
//go down |
|
81
|
|
|
for (let i = startRow; i <= endRow; i++) { |
|
82
|
|
|
result[i][endCol] = counter++; |
|
83
|
|
|
} |
|
84
|
|
|
endCol--; |
|
85
|
|
|
//go left |
|
86
|
|
|
for (let i = endCol; i >= startCol; i--) { |
|
87
|
|
|
result[endRow][i] = counter++; |
|
88
|
|
|
} |
|
89
|
|
|
endRow--; |
|
90
|
|
|
// go up |
|
91
|
|
|
for (let i = endRow; i >= startRow; i--) { |
|
92
|
|
|
result[i][startCol] = counter++; |
|
93
|
|
|
} |
|
94
|
|
|
startCol++; |
|
95
|
|
|
} |
|
96
|
|
|
return result; |
|
97
|
|
|
} |
|
98
|
|
|
|
|
99
|
|
|
module.exports = { |
|
100
|
|
|
spiral, |
|
101
|
|
|
spiral2 |
|
102
|
|
|
}; |
thanhnguyennguyen /
cff
