Matching Brackets
You will be given a sequence of opening and closing brackets of different types ((, ), [, ], {, and ...
Neat Brackets
Given a sequence of opening and closing parentheses ("(" and ")") you will have to determine if it i...
Exists or Not Exists
You will be given some numbers. Then there will contain some queries. In every query there will be g...
XOR Tree
You are given a tree with N vertices. A tree is a connected undirected graph without cycles. The tre...
Counting Friends
Johnny uses a social network called Supernova. Unlike the other social networks, Supernova does not ...
Count the Chaos
Imagine, you have an array of integers of size N. At each index of this array is a unique integer fr...
Laser Light
A 2D grid consists of a lot of special lights bulbs, which turns on upon the incidence of a laser li...
Set Union
Given two sets of integers, print the set containing the union of the two input sets. For example, g...
Holy Tree
What is a tree? A tree is a bidirectional connected graph with no cycle. In a tree, we can create ...
Cut the Rope
Fahim is a rope seller. He has a special tool for cutting ropes. But recently this tool is behaving ...
Village Fair 2
There are N houses in a village far away from here. They are numbered from 1 to N. For this problem ...
Distinctness
A substring of string S is another string S' which occurs in string S. For example: S = aaba and one...
Mario and Princess Peach
The world of Mario can be imagined as 2D grid of $N$ rows and $M$ columns--containing a total of $N ...
Final Days of Goldfinger
We see agent Bond once again being called in time of a great need. The vile criminal Auric Goldfinge...
Smart Query Handler
Bit operators perform bit-wise operations between two binary numbers. Wikipedia says, binary operati...
Distinct Dishting
You are given an array of N integers. Then there will be Q commands of the following type: Change ...
Primary Key
"Clarity-Lon" is the new awesome e-commerce based startup that went to the top of the chart within f...
Earthquake!
Most houses are not as safe as they could be. Earthquake engineering is an interdisciplinary branch ...
Expandable ListView
Minas is working on his new language. He want to add a feature call expandable listview. Here he exp...
Rio and Inversion
One day Rio was returning home from his university and unfortunately lost his phone on the way. He a...
New Year Couple
The new year 2017 is here. To celebrate the 31st night, Mr Rio has thrown a big party at his house. ...
Subarray Sum
You are given an array having N integers. You have to select at most K positions in the array and re...
Sofdor Ali and Bracket Sequence
Sofdor Ali has invented a new game. He asked his assistant Jong Bahadur ( who happens to be a monkey...
Smallest Subarray
You are given an array A of N integers A1, A2, A3, ..., AN . If we select two indices (1 ≤ i ≤ j ≤ N...
Special Pair
Mr. X is an “array pagla” person. He loves doing different types of things with arrays. Today Mr. X ...
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