1207. 独一无二的出现次数
题目链接
来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/unique-number-of-occurrences/
题目描述
题目分析
class Solution {
public:
bool uniqueOccurrences(vector<int>& arr) {
int n = arr.size();
unordered_map<int, int> umap;
for(const auto& a : arr){
umap[a]++;
}
unordered_set<int> uset;
for(const auto& u: umap){
uset.insert(u.second);
}
return umap.size() == uset.size();
}
};