Leetcode-5205 Unique Number of Occurrences(独一无二的出现次数)

 1 typedef long long ll;
 2 #define _for(i,a,b) for(int i = (a);i < b;i ++)
 3 #define _rep(i,a,b) for(int i = (a);i > b;i --)
 4 #define INF 0x3f3f3f3f
 5 #define pb push_back
 6 #define maxn 10000
 7 
 8 class Solution
 9 {
10     public:
11         bool uniqueOccurrences(vector<int>& arr)
12         {
13             int Hash[2003];
14             memset(Hash,0,sizeof(Hash));
15             _for(i,0,arr.size())
16                 Hash[arr[i]+1000] ++;
17             
18             _for(i,0,2001)
19             {
20                 _for(j,i+1,2001)
21                 {
22                     if(Hash[i] && Hash[i]==Hash[j])
23                         return false;
24                 }
25             }
26             return true;
27         }
28 };