Problems

# Status Problem Level Completes Likes
1

Find the number of pairs with odd XOR

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2

Compare two version numbers of a software

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3

Given an array, count the number of pairs with a given sum.

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4

Two Sum Problem

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5

Given an array, find three-element sum closest to Zero

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6

Find the sum of overlapping elements in two sets

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7

Check if the given binary tree is Full or not.

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9

Evaluation of Prefix Expressions (Polish Notation) | Set 1

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10

Find the maximum number present in a String

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11

Convert Prefix to Postfix Expression

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12

Convert Roman Number to Integer

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13

Convert Postfix to Prefix Expression

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14

Convert Postfix to Infix Expression

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15

String to Integer (AtoI - ASCII to Integer)

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16

Longest substring with at most two unique characters

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17

Find duplicates Characters in the given String

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18

Max Flow Problem - Ford-Fulkerson Algorithm

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19

Convert Infix to Postfix Expression

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20

Find three smallest elements in a given array

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21

Convert Prefix to Infix Expression

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22

Check if array contains all unique or distinct numbers.

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23

Reverse a given number – Java Code

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24

Check if given number is perfect square - O(√N) Solution

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25

Find first three largest elements in a given array

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26

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

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27

Find two smallest elements in a given array

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29

Find first two largest elements in a given array

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30

Calculate Logn base r – Java Implementation

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31

Dijkstra Algorithm Implementation – TreeSet and Pair Class

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32

Check if Given Number is power of 2.

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33

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

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35

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

Beginner % 0

Find the number of pairs with odd XOR

Compare two version numbers of a software

Given an array, count the number of pairs with a given sum.

Two Sum Problem

Given an array, find three-element sum closest to Zero

Find the sum of overlapping elements in two sets

Check if the given binary tree is Full or not.

Evaluation of Prefix Expressions (Polish Notation) | Set 1

Find the maximum number present in a String

Convert Prefix to Postfix Expression

Convert Roman Number to Integer

Convert Postfix to Prefix Expression

Convert Postfix to Infix Expression

String to Integer (AtoI - ASCII to Integer)

Longest substring with at most two unique characters

Find duplicates Characters in the given String

Max Flow Problem - Ford-Fulkerson Algorithm

Convert Infix to Postfix Expression

Find three smallest elements in a given array

Convert Prefix to Infix Expression

Check if array contains all unique or distinct numbers.

Reverse a given number – Java Code

Check if given number is perfect square - O(√N) Solution

Find first three largest elements in a given array

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

Find two smallest elements in a given array

Find first two largest elements in a given array

Calculate Logn base r – Java Implementation

Dijkstra Algorithm Implementation – TreeSet and Pair Class

Check if Given Number is power of 2.

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

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