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Articles by Arnab Chakraborty
Page 166 of 377
Program to find number of subsequences with i, j and k number of x, y, z letters in Python
Suppose we have a string s with "x", "y" and "z"s, we have to find the number of subsequences that have i number of "x" characters, followed by j number of "y" characters and followed by k number of "z" characters where i, j, k ≥ 1.So, if the input is like s = "xxyz", then the output will be 3, as we can make two "xyz" and one "xxyz"To solve this, we will follow these steps:n := size of sx := 0, y := 0, z := 0for i in range 0 to n, docount := 0if s[i] is ...
Read MoreProgram to find next board position after sliding the given direction once in Python
Suppose we have a 2048 game board representing the initial board and a string direction representing the swipe direction, we have to find the next board state. As we know in the 2048 game, we are given a 4 x 4 board of numbers (some of them are empty, represented in here with 0) which we can swipe in any of the 4 directions ("U", "D", "L", or "R"). When we swipe, all the numbers move in that direction as far as possible and identical adjacent numbers are added up exactly once.So, if the input is likedirection = "L", then ...
Read MoreProgram to check whether given list is in valid state or not in Python
Suppose we have a list of numbers called nums, we have to check whether every number can be grouped using one of the following rules: 1. Contiguous pairs (a, a) 2. Contiguous triplets (a, a, a) 3. Contiguous triplets (a, a + 1, a + 2)So, if the input is like nums = [7, 7, 3, 4, 5], then the output will be True, as We can group [7, 7] together and [3, 4, 5] together.To solve this, we will follow these steps −n := size of numsdp := a list of size n+1, first value is True, others are ...
Read MoreProgram to find all upside down numbers of length n in Python
Suppose we have a value n. We have to find all upside down numbers of length n. As we knot the upside down number is one that appears the same when flipped 180 degrees.So, if the input is like n = 2, then the output will be ['11', '69', '88', '96'].To solve this, we will follow these steps −Define a function middle() . This will take xif x is 0, thenreturn list of a blank stringif x is same as 1, thenreturn a new list of elements 0, 1, 8ret := a new listmid := middle(x − 2)for each m ...
Read MoreProgram to check all values in the tree are same or not in Python
Suppose we have a binary tree, we have to check whether all nodes in the tree have the same values or not.So, if the input is likethen the output will be TrueTo solve this, we will follow these steps −Define a function solve() . This will take root, and valif root is null, thenreturn Trueif val is not defined, thenval := value of rootreturn true when value of root is same as val and solve(left of root, val) and solve(right of root, val) are also trueLet us see the following implementation to get better understanding −Example Live Democlass TreeNode: def ...
Read MoreProgram to check occurrences of every value is unique or not in Python
Suppose we have a list of numbers nums (positive or negative), we have to check whether the number of occurrences of every value in the array is unique or not.So, if the input is like nums = [6, 4, 2, 9, 4, 2, 2, 9, 9, 9], then the output will be True, as there is 1 occurrence of 6, 2 occurrences of 4, 3 occurrences of 2, and 4 occurrences of 9. So all number of occurrences are unique.To solve this, we will follow these steps −num_counts := a new map where all values and number of occurrences of ...
Read MoreProgram to check whether we can pick up and drop every passenger in given list in Python
Suppose we have a matrix called requested_trips where each row containing [start_x, end_x, num_passengers], and we also have a capacity value. Now each requested trip asks to pick up num_passengers passenger at start_x and drop them off at end_x. We also have a car with the capacity that is given, and start at position x = 0. We want to to pick up every passenger and can only move right side, we have to check whether we can pick up and drop off everyone.So, if the input is like trips = [[1, 25, 2], [3, 4, 3], [5, 12, 3]] ...
Read MoreProgram to find the sum of the lengths of two nonoverlapping sublists whose sum is given in Python
Suppose we have a list of numbers called nums and another value k, we have to find two nonoverlapping sublists in nums whose sum is k, and we have to find the sum of their lengths. When there are more than two possible sublists, we have to find the sum of the lengths of the two smallest sublists. If we cannot find the answer, return −1.So, if the input is like nums = [7, 10, −2, −1, 4, 3] k = 7, then the output will be 3, as we pick the sublists like [7] and [4, 3]. We did ...
Read MoreProgram to check two trees are exactly same based on their structure and values in Python
Suppose we have two binary trees, we have to check whether they are exactly same in terms of their structures and values or not. We can say them as twin trees.So, if the input is likethen the output will be True for the first pair, false for the second pair and third pair as for second and third items are different and the structures are different respectively.To solve this, we will follow these steps −Define a method solve(), this will take two rootsif root0 is null and root1 is null, thenreturn Trueif root0 is null or root1 is null, thenreturn ...
Read MoreProgram to find possible number of palindromes we can make by trimming string in Python
Suppose we have a string s, we have to find the number of ways we can obtain a palindrome by trimming the left and right sides of s.So, if the input is like s = "momo", then the output will be 6, as You can get ["mom", "omo", "o", "o", "m", "m", "o")To solve this, we will follow these steps −Define a function expand() . This will take i, j, sc := 0while i >= 0 and j < size of s and s[i] is same as s[j], doi := i − 1, j := j + 1c := c ...
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