Russian Doll Envelopes
You are given a 2D array of integers envelopes where envelopes[i] = [wi, hi] represents the width and height of an envelope. Return the maximum number of envelopes you can Russian doll (i.e., put one inside other).
Russian Doll Envelopes

You are given a 2D array of integers envelopes where envelopes[i] = [wi, hi] represents the width and height of an envelope. Return the maximum number of envelopes you can Russian doll (i.e., put one inside other).

Example 1:
Input: {"envelopes":[[5,4],[6,4],[6,7],[2,3]]}
Output: 3
Input
arr ={"envelopes":[[5,4],[6,4],[6,7],[2,3]]}

Given 4 envelopes

Envelopes [width, height]

[5, 4]

w×h

[6, 4]

w×h

[6, 7]

w×h

[2, 3]

w×h
Total: 4
Variables
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