Question 1

Happy Number — blackrock Interview Question

Accepted Answer

"Happy Number" is a easy difficulty problem asked at blackrock interviews. It covers the following topics: Hash Table, Math, Two Pointers. You can practice it on LeetCode: https://leetcode.com/problems/happy-number

Question 2

Valid Parentheses — blackrock Interview Question

Accepted Answer

"Valid Parentheses" is a easy difficulty problem asked at blackrock interviews. It covers the following topics: String, Stack. You can practice it on LeetCode: https://leetcode.com/problems/valid-parentheses

Question 3

Evaluate Division — blackrock Interview Question

Accepted Answer

"Evaluate Division" is a medium difficulty problem asked at blackrock interviews. It covers the following topics: Array, String, Depth-First Search, Breadth-First Search, Union Find, Graph, Shortest Path. You can practice it on LeetCode: https://leetcode.com/problems/evaluate-division

Question 4

Find the Maximum Sum of Node Values — blackrock Interview Question

Accepted Answer

"Find the Maximum Sum of Node Values" is a hard difficulty problem asked at blackrock interviews. It covers the following topics: Array, Dynamic Programming, Greedy, Bit Manipulation, Tree, Sorting. You can practice it on LeetCode: https://leetcode.com/problems/find-the-maximum-sum-of-node-values

Question 5

Pairs of Songs With Total Durations Divisible by 60 — blackrock Interview Question

Accepted Answer

"Pairs of Songs With Total Durations Divisible by 60" is a medium difficulty problem asked at blackrock interviews. It covers the following topics: Array, Hash Table, Counting. You can practice it on LeetCode: https://leetcode.com/problems/pairs-of-songs-with-total-durations-divisible-by-60

Question 6

Maximum Subtree of the Same Color — blackrock Interview Question

Accepted Answer

"Maximum Subtree of the Same Color" is a medium difficulty problem asked at blackrock interviews. It covers the following topics: Array, Dynamic Programming, Tree, Depth-First Search. You can practice it on LeetCode: https://leetcode.com/problems/maximum-subtree-of-the-same-color

#	Question Title	Difficulty	Frequency	Topics
1	Happy Number	EASY	100.0	Hash TableMathTwo Pointers
2	Valid Parentheses	EASY	94.0	StringStack
3	Evaluate Division	MEDIUM	82.3	ArrayStringDepth-First Search+4
4	Find the Maximum Sum of Node Values	HARD	73.2	ArrayDynamic ProgrammingGreedy+3
5	Pairs of Songs With Total Durations Divisible by 60	MEDIUM	71.4	ArrayHash TableCounting
6	Maximum Subtree of the Same Color	MEDIUM	71.4	ArrayDynamic ProgrammingTree+1
7	Group Anagrams	MEDIUM	58.6	ArrayHash TableString+1
8	Best Time to Buy and Sell Stock	EASY	58.6	ArrayDynamic Programming
9	Path with Maximum Probability	MEDIUM	49.2	ArrayGraphHeap (Priority Queue)+1
10	Maximum Profit From Trading Stocks	MEDIUM	49.2	ArrayDynamic Programming

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