Problems

# Status Problem Level Completes Likes
141

Separate 0’s and 1’s in a given array

Beginner % 0
142

Find three elements in an array that sum to a zero.

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143

Find three elements in an array that sum to a given value

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144

Majority Element – Part 1

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145

Check whether the given number is a perfect square

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146

Check if array is sorted using recursion

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147

Find the Index from which 0 starts

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148

Find the increasing OR decreasing point in an array

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149

Find the only element in array which appears only once

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150

Algorithm to calculate power(k,n).

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151

Find remainder without using modulo operator

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152

Swap two numbers without using extra variable

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153

Number of 1’s in bit representation of a number

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154

Find the right most unset bit OR zero bit of a number

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155

Find the right most set bit of a number

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156

Find the last non repeating character in a given string.

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157

Find the last repeating character in a given string.

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158

Find the first non repeating character in a given string

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159

Find the first repeating character in a given string

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160

Reverse the given Array without using built in function

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161

Implement Stack Using Linked List

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162

Doubly Linked List Complete Implementation

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163

Circular Linked List Complete Implementation

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164

Get the Sum of all left leaves in a Binary tree

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165

Binary Tree-Postorder Traversal - Non Recursive Approach

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166

Binary Tree - Preorder Traversal - Non Recursive Approach

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167

Binary Tree-Inorder Traversal - Non Recursive Approach

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168

Delete the Binary Tree

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169

Search the Element in a binary tree - With and Without Recursion

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170

Tree Traversals

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171

Find the Size of a Binary Tree without Recursion

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172

Find the Kth Smallest/Largest Element in an Array

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173

Priority Queue in Data Structure

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174

Find the Second Largest Element in an Array

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175

Breadth-First Search/Traversal in a Binary Tree

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Separate 0’s and 1’s in a given array

Find three elements in an array that sum to a zero.

Find three elements in an array that sum to a given value

Majority Element – Part 1

Check whether the given number is a perfect square

Check if array is sorted using recursion

Find the Index from which 0 starts

Find the increasing OR decreasing point in an array

Find the only element in array which appears only once

Algorithm to calculate power(k,n).

Find remainder without using modulo operator

Swap two numbers without using extra variable

Number of 1’s in bit representation of a number

Find the right most unset bit OR zero bit of a number

Find the right most set bit of a number

Find the last non repeating character in a given string.

Find the last repeating character in a given string.

Find the first non repeating character in a given string

Find the first repeating character in a given string

Reverse the given Array without using built in function

Implement Stack Using Linked List

Doubly Linked List Complete Implementation

Circular Linked List Complete Implementation

Get the Sum of all left leaves in a Binary tree

Binary Tree-Postorder Traversal - Non Recursive Approach

Binary Tree - Preorder Traversal - Non Recursive Approach

Binary Tree-Inorder Traversal - Non Recursive Approach

Delete the Binary Tree

Search the Element in a binary tree - With and Without Recursion

Tree Traversals

Find the Size of a Binary Tree without Recursion

Find the Kth Smallest/Largest Element in an Array

Priority Queue in Data Structure

Find the Second Largest Element in an Array

Breadth-First Search/Traversal in a Binary Tree