Category: Google Interview

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Convert Postfix to Prefix Expression

Objective: Given a Postfix expression, write an algorithm to convert it into prefix expression. Example: Input: Postfix expression:  A B +  Output: Prefix expression- + A B Input: Postfix expression:  ABC/-AK/L-* Output: Infix expression:...

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Convert Postfix to Infix Expression

Objective: Given a Postfix expression, write an algorithm to convert it into Infix expression. Example: Input: Postfix expression:  A B +  Output: Infix expression- (A + B) Input: Postfix expression:  ABC/-AK/L-* Output: Infix expression:...

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Longest substring with at most two unique characters

Objective: Given a string, write an algorithm to find the longest substring with at most two characters. Example: Input: aabbccddc Output: ccddc, length: 5 Input: aabacbeeeebeaabb Output: beeeebe, length 7 Input: aaaaaa Output: Only...

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Convert Prefix to Infix Expression

Objective: Given a Prefix expression, write an algorithm to convert it into Infix expression. Example: Input: Prefix expression: + A B Output: Infix expression- (A + B) Input: Prefix expression: *-A/BC-/AKL Output: Infix expression:...

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Convert Infix to Prefix Expression

Objective: Given an Infix expression, write an algorithm to convert it into Prefix expression. Example: Input: Infix expression – A + B Output: Prefix expression- +AB Input: Infix expression – A+B*(C^D-E) Output: Prefix expression-...

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Max Flow Problem – Ford-Fulkerson Algorithm

Objective: Given a directed graph that represents a flow network involving source(S) vertex and Sink (T) vertex.  Each edge in the graph has an individual capacity which is the maximum flow that edge allows....

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Evaluation of Infix expressions

Infix notation is commonly used in arithmetic formula or statements, the operators are written in-between their operands. Let’s assume the below Operands are real numbers. Permitted operators: +,-, *, /, ^(exponentiation) Blanks are permitted...

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Merge K sorted Linked List – Using Priority Queue

Objective: Given, K sorted linked list, Write an algorithm to merge all the linked list into one linked list which will be also be sorted. Example: List 1: –>1–>5 List 2: –>4–>8 List 3:...

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Find the nearest building which has bike | Find nearest specific vertex from source in a graph.

Objective: Given a matrix (NxN) which represents the buildings in community. You are in a building and you need a bike to travel.  There are few buildings in community which has bikes which you...

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Find Number of reverse pairs in an array

Objective: Given an array of integers A[],find no of reverse pairs means no of (i, j) pairs where i < j and A[i]>A[j]. Example: A[] = {10, 3, 4, 2, 5, 7, 9, 11}...

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Check if Given Number is power of 2.

Objective: Given a number, write a program to find if number is power of two. Example: N = 5 Output: false. N = 8 Output: true (23) N = 512 Output: true (29) Approach:...

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Find no of reverse pairs in an array which is sorted in two parts in O(N)

Objective: Given an array of integers A[] which is sorted in two parts (both parts are individually sorted), find no of reverse pairs means no of (i, j) pairs where i belongs to the...

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Check if two Strings are equal without using built-in function – Java

Objective– Given two strings, find out if they are equal or not without using any built-in function (without using equals() function in java). Example: String x=’tutorial’ and String y=’tutorial’ are equal – true String...

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Replace all vowels with next consonant in a given string

Objective: Given a string, write an algorithm to replace all the vowels with next consonant, and if last alphabet is vowel, remove it. Example: String input: “abcdefg” Output: “bbcdffg” String input: “aaaabccceee” Output: “bbbbbccc”...

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