Browse LeetCode problems frequently asked by AT&T. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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30 days
3 months
6 months
More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Separate Black and White Balls
MEDIUM
100%
Two PointersStringGreedy
Minimum Operations to Reduce an Integer to 0
MEDIUM
100%
Dynamic ProgrammingGreedyBit Manipulation
Count Univalue Subtrees
MEDIUM
100%
TreeDepth-First SearchBinary Tree
Find the Peaks
EASY
100%
ArrayEnumeration
Two Sum
EASY
100%
ArrayHash Table
Replace the Substring for Balanced String
MEDIUM
100%
StringSliding Window
Fill Missing Data
EASY
100%
Count All Valid Pickup and Delivery Options
HARD
100%
MathDynamic ProgrammingCombinatorics
Game of Life
MEDIUM
100%
ArrayMatrixSimulation
Reformat Phone Number
EASY
100%
String
Check If Digits Are Equal in String After Operations II
HARD
100%
MathStringCombinatoricsNumber Theory
Arithmetic Slices
MEDIUM
100%
ArrayDynamic ProgrammingSliding Window
Parsing A Boolean Expression
HARD
100%
StringStackRecursion
Insert Delete GetRandom O(1)
MEDIUM
100%
ArrayHash TableMathDesignRandomized
Minimum Absolute Difference
EASY
100%
ArraySorting
Eliminate Maximum Number of Monsters
MEDIUM
100%
ArrayGreedySorting
Text Justification
HARD
100%
ArrayStringSimulation
Find the Number of Good Pairs II
MEDIUM
100%
ArrayHash Table
Find the Number of Good Pairs I
EASY
100%
ArrayHash Table
Minimum Array Changes to Make Differences Equal
MEDIUM
100%
ArrayHash TablePrefix Sum
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