Leetcode Problem 895. Maximum Frequency Stack

895. Maximum Frequency Stack

Leetcode Solutions

Stack of Stacks Approach

Initialize freq, group, and maxfreq.
For push(val): Increment freq[val]. Update maxfreq if freq[val] is greater than maxfreq. Push val onto group[freq[val]].
For pop(): Pop an element from group[maxfreq]. Decrement freq[val] of the popped element. If group[maxfreq] is empty, decrement maxfreq. Return the popped element.

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