Important Program Collection



C/C++ Greedy Algorithm Programs

C/C++ Backtracking Programs




C/C++ Divide and Conquer Programs:


































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[13 Feb 2020] Check if a given sequence of moves for a robot is circular or not

Check if a given sequence of moves for a robot is circular or not Link:  https://www.youtube.com/watch?v=f7Zd8hEbCz0 Given a sequence of moves for a robot, check if the sequence is circular or not. A sequence of moves is circular if first and last positions of robot are same. A move can be on of the following. G - Go one unit L - Turn left R - Turn right Input: path[] = "GLGLGLG" Output: Given sequence of moves is circular Input: path[] = "GLLG" Output: Given sequence of moves is circular The idea is to consider the starting position as (0, 0) and direction as East (We can pick any values for these). If after the given sequence of moves, we come back to (0, 0), then given sequence is circular, otherwise not. N | | W -------------- E | | S The move ‘G’ changes either x or y according to following rules. a) If current direction is North, then ‘G’ increments y and doesn’t cha...
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Typical Programs in C/C++

  Sum of two large numbers Difficulty Level :   Medium   Last Updated :  04 Jun, 2019 Given two numbers as strings. The numbers may be very large (may not fit in long long int), the task is to find sum of these two numbers. Examples: Input : str1 = "3333311111111111", str2 = "44422222221111" Output : 3377733333332222 Input : str1 = "7777555511111111", str2 = "3332222221111" Output : 7780887733332222 The idea is based on school mathematics. We traverse both strings from end, one by one add digits and keep track of carry. To simplify the process, we do following: 1) Reverse both strings. 2) Keep adding digits one by one from 0’th index (in reversed strings) to end of smaller string, append the sum % 10 to end of result and keep track of carry as sum/10. 3) Finally reverse the result. // C++ program to find sum of two large numbers. #include<bits/stdc++.h> using namespace std;     // Function for finding sum of la...
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Find the most frequent digit without using array/string

Find the most frequent digit without using array/string Last Updated: 20-11-2018 Given an integer, find the most occurring digit in it. If two or more digits occur same number of times, then return the highest of them. Input integer is given as an int variable, not as a string or array. Use of hash or array or string is not allowed. Example: Input: x = 12234 Output: The most frequent digit is 2 Input: x = 1223377 Output: The most frequent digit is 7 Input: x = 5 Output: The most frequent digit is 5 Input: x = 1000 Output: The most frequent digit is 0 We could create a map of size 10 and store count of all digits, but use of any array/string is not allowed. The idea is simple, we write a function that counts occurrences of a given digit in a given integer. Then we count all digits from 0 to 9 in given integer. We keep updating maximum count whenever count becomes more or same as previous count. Below is the implementation. // Finds maximum occurring digit without using any array/...
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