forked from TonnyL/Windary
-
Notifications
You must be signed in to change notification settings - Fork 0
/
RotateImage.js
83 lines (78 loc) · 1.78 KB
/
RotateImage.js
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
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/**
* You are given an n x n 2D matrix representing an image.
*
* Rotate the image by 90 degrees (clockwise).
*
* Note:
* You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.
*
* Example 1:
*
* Given input matrix =
* [
* [1,2,3],
* [4,5,6],
* [7,8,9]
* ],
*
* rotate the input matrix in-place such that it becomes:
* [
* [7,4,1],
* [8,5,2],
* [9,6,3]
* ]
* Example 2:
*
* Given input matrix =
* [
* [ 5, 1, 9,11],
* [ 2, 4, 8,10],
* [13, 3, 6, 7],
* [15,14,12,16]
* ],
*
* rotate the input matrix in-place such that it becomes:
* [
* [15,13, 2, 5],
* [14, 3, 4, 1],
* [12, 6, 8, 9],
* [16, 7,10,11]
* ]
*
* Accepted.
*/
/**
* @param {number[][]} matrix
* @return {void} Do not return anything, modify matrix in-place instead.
*/
let rotate = function (matrix) {
// Reverse
for (let i = 0; i < parseInt(matrix.length / 2); i++) {
let j = matrix.length - 1 - i;
let cache = matrix[i];
matrix[i] = matrix[j];
matrix[j] = cache;
}
// Transpose
for (let i = 0; i < matrix.length; i++) {
for (let j = i + 1; j < matrix.length; j++) {
let cache = matrix[i][j];
matrix[i][j] = matrix[j][i];
matrix[j][i] = cache;
}
}
};
let ints1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
rotate(ints1);
if (ints1.toString() === [[7, 4, 1], [8, 5, 2], [9, 6, 3]].toString()) {
console.log("pass")
} else {
console.error("failed")
}
let ints2 = [[5, 1, 9, 11], [2, 4, 8, 10], [13, 3, 6, 7], [15, 14, 12, 16]];
rotate(ints2);
if (ints2.toString() === [[15, 13, 2, 5], [14, 3, 4, 1], [12, 6, 8, 9], [16, 7, 10, 11]].toString()) {
console.log("pass")
} else {
console.error("failed")
}