-
Notifications
You must be signed in to change notification settings - Fork 21
/
Permutations.js
99 lines (88 loc) 路 2.03 KB
/
Permutations.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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
/**
* Given a collection of distinct numbers, return all possible permutations.
*
* For example,
* [1,2,3] have the following permutations:
* [
* [1,2,3],
* [1,3,2],
* [2,1,3],
* [2,3,1],
* [3,1,2],
* [3,2,1]
* ]
*
* Accepted.
*/
/**
* @param {number[]} nums
* @return {number[][]}
*/
let permuteUnique = function (nums) {
let results = [];
if (nums.length === 0) {
return results;
}
if (nums.length === 1) {
results.push([nums[0]]);
return results
}
let ints = nums.slice(0, nums.length - 1);
let set = new Set();
permuteUnique(ints).forEach(function (l) {
for (let i = 0; i <= l.length; i++) {
let tmp = [];
l.forEach(function (element) {
tmp.push(element);
});
tmp.splice(i, 0, nums[nums.length - 1]);
set.add(tmp.join(','));
}
});
set.forEach(function (value, value2, set) {
let tmp = value.split(',');
for (let i = 0; i < tmp.length; i++) {
tmp[i] = parseInt(tmp[i]);
}
results.push(tmp);
});
return results
};
if (permuteUnique([]).length === 0) {
console.log("pass")
} else {
console.error("failed")
}
let list0 = permuteUnique([1]);
if (list0.length === 1) {
console.log("pass")
} else {
console.error("failed")
}
if (new Set(list0).toString() === new Set([[1]]).toString()) {
console.log("pass")
} else {
console.error("failed")
}
let list1 = permuteUnique([1, 2]);
if (list1.length === 2) {
console.log("pass")
} else {
console.error("failed")
}
if (new Set(list1).toString() === new Set([[1, 2], [2, 1]]).toString()) {
console.log("pass")
} else {
console.error("failed")
}
let list2 = permuteUnique([1, 2, 3]);
if (list2.length === 6) {
console.log("pass")
} else {
console.error("failed")
}
if (new Set(list2).toString() === new Set([[1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1]]).toString()) {
console.log("pass")
} else {
console.error("failed")
}