Category: Oracle

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Graph – Find Cycle in Undirected Graph using Disjoint Set (Union-Find)

Objective: Given a graph, check if the graph contains a cycle using disjoint set. Note: Disjoint-set data structure, also called a union–find data structure or merge–find set. Example: Earlier in Detect Cycle in Undirected Graph using DFS we...

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Graph – Detect Cycle in Undirected Graph using DFS

Objective: Given undirected graph write an algorithm to find out whether graph contains cycle or not. Example: Approach: Earlier we have seen how to find cycles in directed graphs. In this article we will...

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Find the last repeating character in a given string.

Objective: Given a string, write an algorithm to find the last repeating character in it. Example: String input = “horizon tutorials” Output: ‘i’ String input = “algorithms” Output: No repeating character found. Approach: Naive...

11

Dynamic Programming – Longest Common Subsequence

Objective: Given two string sequences, write an algorithm to find the length of longest subsequence present in both of them. These kind of dynamic programming questions are very famous in the interviews like Amazon,...

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Dynamic Programming – Maximum size square sub-matrix with all 1s

Objective: Given a matrix of 0’s and 1’s (binary matrix). Find out Maximum size square sub-matrix with all 1’s. Example: Approach: Base Cases: If only one row is given then cells with 1’s will...

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Backtracking – Search a Word In a Matrix

Objective : Given a 2D matrix of characters. Check whether the word exist in the matrix or not. If it exists then print its path. All movements are allowed (right, left, up, down and...

3

Check if one string is Rotation of another string

Objective: Write an algorithm to check if one string is Rotation of another string. This question has been asked in the Amazon interview. Example: Input Strings : ‘sumitjain’ and ‘tjainsumi’ Output : true Input...