2671. 频率跟踪器

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2671. 频率跟踪器

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题目链接：2671. 频率跟踪器

代码如下：

class FrequencyTracker {
public:FrequencyTracker() {}void add(int number) {--freq[cnt[number]];//去掉一个旧的cnt[number]++freq[++cnt[number]];//添加一个新的cnt[number]}void deleteOne(int number) {if(!cnt[number])    return;--freq[cnt[number]];//去掉一个旧的cnt[number]++freq[--cnt[number]];//添加一个新的cnt[number]}bool hasFrequency(int frequency) {return freq[frequency];}private:unordered_map<int,int> cnt;//number出现的次数unordered_map<int,int> freq;//number出现次数的出现次数
};/*** Your FrequencyTracker object will be instantiated and called as such:* FrequencyTracker* obj = new FrequencyTracker();* obj->add(number);* obj->deleteOne(number);* bool param_3 = obj->hasFrequency(frequency);*/

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