# Status Problem video Level Completes Likes
525

Find the number of pairs with odd XOR

Beginner % 2
499

Compare two version numbers of a software

Medium % 1
473

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

Beginner % 0
471

Two Sum Problem

Beginner % 0
459

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

Medium % 1
451

Find the sum of overlapping elements in two sets

Beginner % 0
425

Check if the given binary tree is Full or not

Beginner % 1
410

Evaluation of Prefix Expressions (Polish Notation) | Set 1

Medium % 0
394

Find the maximum number present in a String

Beginner % 0
390

Convert Prefix to Postfix Expression

Medium % 0
389

Convert Roman Number to Integer

Beginner % 0
387

Convert Postfix to Prefix Expression

Medium % 0
377

Convert Postfix to Infix Expression

Medium % 0
375

String to Integer (AtoI - ASCII to Integer)

Beginner % 1
373

Longest substring with at most two unique characters

Medium % 0
369

Find duplicates Characters in the given String

Beginner % 0
368

Max Flow Problem - Ford-Fulkerson Algorithm

Hard % 0
365

Convert Infix to Postfix Expression

Medium % 0
364

Find three smallest elements in a given array

Beginner % 0
361

Convert Prefix to Infix Expression

Medium % 0
356

Check if array contains all unique or distinct numbers

Beginner % 0
353

Reverse a given number

Beginner % 1
352

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

Beginner % 0
350

Find first three largest elements in a given array

Beginner % 0
347

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

Hard % 0
342

Find two smallest elements in a given array

Beginner % 0
337

Find first two largest elements in a given array

Beginner % 0
336

Calculate Logn base r – Java Implementation

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334

Dijkstra Algorithm Implementation – TreeSet

Hard % 0
330

Check if Given Number is power of 2

Beginner % 1
325

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

Medium % 1
313

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

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

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

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