Rat in the maze | Minimum number of steps
Given a maze with obstacles, find the minimum number of steps the rat needs to take to reach the destination.
Category: Competitive Programming
Rat in the maze
Given a NxN matrix with 0s and 1s. A block with value 1 can be used to travel ahead in the matrix. Now, consider mat[0][0] as the starting point for the rat.
Heap Data structure | Heap Sort in C++
The Heapsort algorithm uses Heap data structure to sort an array in O(nlogn) time complexity. It starts by calling Build-Max-Heap.
Fibonacci Numbers in O(logn) [Matrix Exponentiation]
Matrix multiplication can be performed in O(logn) by using matrix exponentiation. It is one of the most used techniques
Minimum number of moves to equal array elements – LeetCode Solution [Medium]
Given an integer array nums of size n, return the minimum number of moves required to make all array elements equal. In one move, you can increment n – 1 elements of the array by 1.
Number of ways to climb a stair having n steps – LeetCode Solution [Easy]
You are climbing a staircase. It has n steps upto the top. Each time you can either climb 1 step or 2 steps. You’ve to find the number of ways to climb the stair.
Implementing basic Mathematical operations (Euclidean algorithm for GCD)
Given two non-negative integers a and b, you’ve to find the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) of the two numbers. In other words, find the largest number that divides them both. The Euclidean algorithm is one of the oldest numerical algorithms to compute the greatest common divisor (gcd) of two positive integers.
Implementing basic Mathematical operations (Exponential)
Drawback of this method is that it will cause int overflow. This is because pow( ) method will calculate the exponential before taking the modulo.
Find all the occurrences of a substring in a given string in C++
Given a string s1, find the occurrences of string s2 in s1.
Input: s1 = “onlycode”; s2 = “code”
Tower of Babylon Solution – SPOJ.com
Given n different types of blocks. Each one of them may be duplicated as many times as you like. Each type has a height y, a width x and a depth z.