# Status Problem Level Completes Likes
71

Collatz Conjecture - Steps to transform Number to 1

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72

String to Integer (AtoI - ASCII to Integer)

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Find all Prime Numbers less than equal to N | Set 1

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Find third largest element in a given array

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Find duplicates Characters in the given String

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Sum of all Unique elements in a given array

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77

Java program to find the largest element in array

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Find three smallest elements in a given array

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79

Stack Java Class - Explained

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Infix, Postfix and Prefix Notations/Expressions

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Count Set bits in a given Number

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Check if array contains all unique or distinct numbers.

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83

Product of all Unique elements in a given array.

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84

Reverse a given number – Java Code

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85

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

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Find first three largest elements in a given array

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Selection Sort – Java Implementation

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Valid Brackets – Part 2 | Stack Method

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90

Find the roots of Quadratic Equation – Java Program

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91

Given two strings validate the output string

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92

Find two smallest elements in a given array

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93

Front and Back Search in an Array

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95

Multiply with power of 2 without using pow() or * operator

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Find first two largest elements in a given array

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Calculate Logn base r – Java Implementation

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98

Java Program to find Sum the elements of an Array

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Insertion Sort – Java Implementation

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100

Find Largest and Smallest word in a given String

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101

Check if Given Number is power of 2.

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102

Rotate the given array in cycles

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104

Find the Area and Perimeter of Rectangle – Java Program

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105

Stack Data Structure – Introduction and Implementation

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Collatz Conjecture - Steps to transform Number to 1

String to Integer (AtoI - ASCII to Integer)

Find all Prime Numbers less than equal to N | Set 1

Find third largest element in a given array

Find duplicates Characters in the given String

Sum of all Unique elements in a given array

Java program to find the largest element in array

Find three smallest elements in a given array

Stack Java Class - Explained

Infix, Postfix and Prefix Notations/Expressions

Count Set bits in a given Number

Check if array contains all unique or distinct numbers.

Product of all Unique elements in a given array.

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

Selection Sort – Java Implementation

Valid Brackets – Part 2 | Stack Method

Find the roots of Quadratic Equation – Java Program

Given two strings validate the output string

Find two smallest elements in a given array

Front and Back Search in an Array

Multiply with power of 2 without using pow() or * operator

Find first two largest elements in a given array

Calculate Logn base r – Java Implementation

Java Program to find Sum the elements of an Array

Insertion Sort – Java Implementation

Find Largest and Smallest word in a given String

Check if Given Number is power of 2.

Rotate the given array in cycles

Find the Area and Perimeter of Rectangle – Java Program

Stack Data Structure – Introduction and Implementation