#1009Hard· asked at 5 companies
Maximum Frequency Stack
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What we know
Example 1
Input: ["FreqStack","push","push","push","push","push","push","pop","pop","pop","pop"] [[],[5],[7],[5],[7],[4],[5],[],[],[],[]] Output: [null,null,null,null,null,null,null,5,7,5,4]
Constraints
- •
0 <= val <= 10^9 - •
At most
2 * 10^4calls will be made topushandpop. - •
There is at least one element in the stack before calling
pop.