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Given a number N as input. The goal is to find numbers m upto N that satisfy the following condition. Here N
Given a string str containing a number and a sum total as input. The goal is to find numbers upto str that have sum of digits equal to total.Let us understand with examples.For ExampleInput - N=”110” sum=5Output - Count of numbers smaller than or equal to N with given digit sum are: 7Explanation - The numbers upto 110 that have sum of digits equal to 5 are :-5, 14, 23, 32, 41, 50 and 104.Input - N=”1000” sum=3Output - Count of numbers smaller than or equal to N with given digit sum are: 10Explanation - The numbers upto 1000 that ... Read More
Given a row x col matrix as input. The goal is to find all submatrices within the matrix[row][col] such that the sum of elements of that submatrix is divisible by integer k.If the matrix is mat[3][3] and k is 4 then submatrices will be as shown below:- Let us understand with examples.For ExampleInput - matrix[3][3] = { {1, 1, 1}, {2, 2, 2}, {3, 3, 3} } k=4Output - Count of sub-matrices having sum divisible 'k' are: 4Explanation - The submatrices will be as shown in above.Input - matrix[3][3] = { {1, 1, 1}, {2, 2, 2 }, {3, 3, ... Read More
Given a range of numbers between start and end. The goal is to find the count of numbers that have the first digit equal to the last digit and fall in the range [ first, last ].All single digit numbers will be counted if they lie in the range.Let us understand with examples.For ExampleInput - start = 100, end = 200Output - Count of Numbers in Range where first digit is equal to last digit of the number are: 10Explanation - The numbers will be:101, 121, 131, 141, 151, 161, 171, 181 and 191.Input - start = 1, end = ... Read More
Given a positive number as the number of digits and a sum. The goal is to find all d digit numbers that have sum of digits equal to the input sum. The numbers having leading zeros will not be considered as d digit numbers.The ranges are digits between 1 to 100 and sum between 1 and 500.Let us understand with examples.For ExampleInput - digits = 3, digi_sum = 3Output - Count of n digit numbers whose sum of digits equals to given sum are: 6Explanation - Three digit numbers having sum of digits as 3 are:102, 111, 120, 201, 210, ... Read More
Given a long variable containing a positive number as input. The goal is to find the count of alphabets whose ASCII value digits are present in the digits of the number.Pick any two digits from the number and arrange them in a manner such that they form an ASCII value of English alphabets. ASCII values of A-Z start from 65 to 90 and ASCII values of a-z start from 97 to 122.Total numbers that are to be picked will be 26+26=52.Let us understand with examples.For ExampleInput - N_digits = 163465Output - Count of alphabets whose ASCII values can be formed with ... Read More
Given a positive number N as input. The goal is to find the number of ways in which we can express N as a sum of 1s, 3s and 4s only. For example, if N is 4 then it can be represented as 1+1+1+1, 3+1, 1+3, 4 so the number of ways will be 4.Let us understand with examples.For ExampleInput - N=5Output - Count of different ways to express N as the sum of 1, 3 and 4 are: 6Explanation - 5 can be represented as:1+1+1+1+11+3+13+1+11+1+34+11+4Input - N=6Output - Count of different ways to express N as the sum of ... Read More
Given a matrix [ ][ ] having dimensions as row x col. The goal is to find the count of cells of matrix that meet the given condition:Value of cell matrix [i][j] + no. of adjacent cells to it = a Fibonacci numberNumbers in Fibonacci series:- 0, 1, 1, 2, 3, 5, 8, 13, 21, 43 …..Let us understand with examples.For ExampleInput - matrix[row][col] = {{1, 4, 1}, {2, 0, 1}, {5, 1, 1}Output - Count of cells in a matrix which give a Fibonacci number when the count of adjacent cells is added are: 4Explanation 0 1 ... Read More
Given three numbers 'a', 'b' and 'c' as input. The goal is to find the count/value of 'a', 'b' and 'c' after n seconds such that the rate of reproductions are:-Every a changes to b after every 2 secondsEvery b changes to c after every 5 secondsEvery c changes to 2 a after every 12 seconds.Let us understand with examples.For ExampleInput - n_seconds = 62 a = 1 b = 1 c = 1Output - Count of a after n seconds for given reproduction rate is: 0Count of b after n seconds for given reproduction rate is: 33Count of c after ... Read More
Given two numbers start and end as range variables. The goal is to find the count of numbers that lie in this range [start, end] and have a difference of sum of digits at even and sum of digits at odd positions as Prime.That is (sum of digits at even position)-(sum of digits at odd position) = a Prime numberLet us understand with examples.For ExampleInput - start = 230, end = 270Output - Count of Numbers in Range with difference between Sum of digits at even and odd positions as Prime are: 6Explanation - The number(s) between 230 to 270 ... Read More