forked from fuwutu/LeetCode
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathLongest Consecutive Sequence.cpp
More file actions
53 lines (49 loc) · 1.24 KB
/
Copy pathLongest Consecutive Sequence.cpp
File metadata and controls
53 lines (49 loc) · 1.24 KB
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
class Solution
{
public:
int longestConsecutive(vector<int> &num)
{
unordered_set<int> us;
for (auto x : num)
{
us.insert(x);
}
int longest = 0;
for (auto x: num)
{
auto it = us.find(x);
if (it != us.end())
{
us.erase(it);
int small = x - 1;
while (true)
{
it = us.find(small);
if (it == us.end())
{
break;
}
us.erase(it);
small -= 1;
}
int big = x + 1;
while (true)
{
it = us.find(big);
if (it == us.end())
{
break;
}
us.erase(it);
big += 1;
}
int length = big - small - 1;
if (length > longest)
{
longest = length;
}
}
}
return longest;
}
};