Need to implement set and get operations.
Be aware that one cell may depend on other cells, e.g. cells[1, 2] = cells[1, 1] + cell[1, 3] * 2
yrxwin
@yrxwin
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Design excel table

Maximum length of zero sum subarray
Given an array with positive and negative integers, find the max length subarray having sum = 0.

Russian doll envelopes
You have a set of envelopes of different widths and heights. One envelope can fit into another if and only if both the width and height of one envelope is greater than the width and height of the other envelope.
What is the maximum number of envelopes can you Russian doll? (put one inside other) 
Sort transformed array
Given a sorted array of integers and integer values a, b and c, apply a function of the form f(x) = ax^2+bx+c to each element x in the array.
The returned array should be sorted.
Example:
Given x = [4 , 2 , 2 , 4] , a=1 , b=3 , c=5, output should be [3, 9, 15, 33].
Given x = [4 , 2 , 2 , 4] , a=1 , b=3 , c=5, output should be [23, 5, 1, 7].Expected time complexity : O(n);

Word Box
Given a set of words, find whether they form word box.
A list of words can form a valid word box, when arranged horizontally forms same words if you read vertically.
Ex: BASS, AUTO, STAR, SORE
BASS
AUTO
STAR
SORE 
RE: Change array inplace
@1337c0d3r My understanding is that there is no duplicate, just 0 to n1 every number appear once.

Group numbers via digits frequency
A list of numbers are given. We need to find the total number of groups in which the digits of each number have same frequency.
For example if numbers are:
1
10
303
330There are 3 groups:
G1={1}has one 1.
G2={10} has one 1 and one 0.
G3={330, 303} has one 0 and two 3s. 
RE: Change array inplace
@1337c0d3r I though should do inplace, otherwise too simple.