-
-
Notifications
You must be signed in to change notification settings - Fork 297
/
Copy path47.cpp
135 lines (129 loc) · 4.09 KB
/
47.cpp
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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
__________________________________________________________________________________________________
20ms
class Solution {
public:
vector<vector<int>> permuteUnique(vector<int>& nums) {
vector<vector<int>> result;
vector<int> tmp = nums;
sort(nums.begin(), nums.end());
do{
std::copy(nums.begin(), nums.end(), tmp.begin());
result.push_back(tmp);
}while(next_permutation(nums.begin(), nums.end()));
return result;
}
};
__________________________________________________________________________________________________
24ms
class Solution {
public:
vector<vector<int>> permuteUnique(vector<int>& nums) {
vector<vector<int>> res;
vector<int> out, visited(nums.size(), 0);
sort(nums.begin(), nums.end());
permuteUniqueDFS(nums, 0, visited, out, res);
return res;
}
void permuteUniqueDFS(vector<int>& nums, int level, vector<int>& visited, vector<int>& out, vector<vector<int>>& res) {
if (level >= nums.size()) {res.push_back(out); return;}
for (int i = 0; i < nums.size(); ++i) {
if (visited[i] == 1) continue;
if (i > 0 && nums[i] == nums[i - 1] && visited[i - 1] == 0) continue;
visited[i] = 1;
out.push_back(nums[i]);
permuteUniqueDFS(nums, level + 1, visited, out, res);
out.pop_back();
visited[i] = 0;
}
}
};
__________________________________________________________________________________________________
28ms
class Solution {
private:
void perm(vector<int>& nums, vector<vector<int>>& result, int begin)
{
if(begin >=nums.size())
{
result.push_back(nums);
return;
}
unordered_set<int> myset;
perm(nums, result, begin + 1);
myset.insert(nums[begin]);
for(int i = begin + 1;i<nums.size();i++)
{
if(myset.count(nums[i] )== 0)
{
swap(nums[begin], nums[i]);
perm(nums, result, begin + 1);
swap(nums[begin], nums[i]);
myset.insert(nums[i]);
}
}
}
public:
vector<vector<int>> permuteUnique(vector<int>& nums) {
vector<vector<int>> result;
perm(nums, result, 0);
return result;
}
};
__________________________________________________________________________________________________
9596 kb
class Solution {
public:
vector<vector<int>> permuteUnique(vector<int>& nums)
{
vector< vector<int> > v;
sort(nums.begin(), nums.end());
do {
v.push_back(nums);
} while(next_permutation(nums.begin(), nums.end()));
return v;
}
};
__________________________________________________________________________________________________
9652 kb
class Solution {
public:
void print_vector(vector<int> &nums) {
for (size_t i = 0 ; i < nums.size(); i++) {
cout<<nums[i]<<",";
}
cout<<endl;
}
void next_perm(vector<int> &nums) {
int pivot = nums.size()-1;
while(pivot >=1 && nums[pivot-1] >= nums[pivot]) {
pivot--;
}
if (pivot == 0) {
sort(nums.begin(), nums.end());
return ;
}
int swap_point = pivot-1;
for(int j = pivot; j<nums.size() ; j++) {
if (nums[j]>nums[pivot-1]) {
swap_point = j;
}
}
cout<<swap_point<<pivot;
print_vector(nums);
swap(nums[pivot -1], nums[swap_point]);
reverse(nums.begin() + pivot, nums.end());
print_vector(nums);
return;
}
vector<vector<int>> permuteUnique(vector<int>& nums) {
vector<vector<int>> solution;
sort(nums.begin(), nums.end());
vector<int> new_nums (nums);
do{
solution.push_back(new_nums);
next_perm(new_nums);
}while(new_nums!=nums);
return solution;
}
};
__________________________________________________________________________________________________