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**Content Feed**

Solved

Chain multiplication - 03

Following up the problem in 55305, you found the minimum number of multiplications needed to multiply a chain of matrices. In ...

1 giorno ago

Solved

Chain multiplication - 02

Following up on the problem in 55295, you found the number of multiplications needed to multiply two matrices. Now, you are giv...

1 giorno ago

Solved

Cut the rod

A rod of length n can be cut in different sizes. Different price is associated with different length of cuts. length, len= [1,...

1 giorno ago

Solved

Sort Non-zeros

Consider 0s in a vector creates a break-point. sort all the sub-arrays created by those break points. For example, a = [3, 4, 1...

3 giorni ago

Solved

Chain multiplication - 01

Say, you are given two matrices - A (shape= 3*4) and B(shape = 4*5). If you multiply these two matrices, the resultant matrix w...

3 giorni ago

Solved

Count estrangements

Recently I made a puzzle for my wife that included a cryptogram, which involves an arrangement of the letters A through Z. I use...

8 giorni ago

Solved

Determine whether one vector is a subset of another

While bumbling through a pair of problems in the Number Theory group, I wrote code to determine whether a vector is a subset of ...

16 giorni ago

Solved

Cyclotomic polynomial

Given a Natural number (N), return the corresponding Cyclotomic Polynomial.

16 giorni ago

Solved

Parametric Array

Create a row vector, 1xN (Integer, >1), such that the mean of the vector is M (Real number) and the standard deviation of the ...

16 giorni ago

Solved

List the semiprimes

A semiprime number—or a 2-almost prime—is the product of two prime numbers. The numbers and are semiprimes, but and are not....

17 giorni ago

Solved

Nuemann Polynomials

Return the coefficients of nth (n>=0) Nuemann polynomial, (a sequence in 1/t) as polynomials in alpha. The expected output is a...

23 giorni ago

Solved

Scorer's Function

Evaluate the Scorer's function for a given input. The expected output is Gi(x). Note - The precision will vary for test cases...

30 giorni ago

Solved

B-Zuckerman Numbers

Similar to my last problem (B_Harshad Numbers), B-Zuckerman Numbers are numbers that are divisable by the product of their digit...

circa un mese ago

Solved

B-Harshad Numbers

Determine (and provide as output in decimal form) all the harshad numbers base B (B-Harshad) from a given array of decimal numbe...

circa un mese ago

Solved

Distance walked 1D

Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

circa un mese ago

Solved

Consecutive Pairs of Smooth Numbers from Set of Prime Numbers

Given an input set of prime numbers (p), generate all pairs of consecutive smooth numbers (x) (see Stormer's Theorem). For exam...

circa un mese ago

Solved

Trap a knight

Consider a knight on an infinite chessboard labeled with numbers spiraling outward. A knight starting on the square labeled 1 ca...

circa un mese ago

Solved

Flip the parity of digits in a decimal expansion

The number 349 has the decimal expansion . If we change the even digits from positive to negative, then the number becomes 269 (...

circa un mese ago

Solved

Count the peaceful queens

In a 5x5 chessboard with a queen of one color (white, say) on the perimeter, one can place 12 black queens on the board such tha...

circa 2 mesi ago

Solved

Hyperperfect Numbers

A k-hyperperfect number is a natural number n for which the equality n = 1 + k(σ(n) − n − 1) holds, where σ(n) is the divisor ...

circa 2 mesi ago

Solved

Determine whether a number is practical

A number is practical if all smaller numbers can be written as a sum of the proper divisors of . The number 24 is practical bec...

circa 2 mesi ago

Solved

List odd twin composites

Twin primes, or prime numbers that differ by 2 (e.g., 17 and 19, 59 and 61, or 191 and 193), are the subject of several Cody pro...

2 mesi ago

Solved

Find the length of stream affected by a spill

When a contaminant is spilled into a stream, one might want to know how much of the stream is affected—e.g., the length over whi...

2 mesi ago

Solved

Find the particular dividend

It is known that once you write the sequence 10101...101 long enough, the number will be finally divisible by any odd number if ...

2 mesi ago

Solved

Count the ways to make Scorigami

Regarding the sport known as American football, some people are such rabid fans that they can tell you the statistics of every p...

2 mesi ago

Solved

Solve an ODE: concentrations predicted by the cells-in-series model

One approach for predicting mixing and transport of contaminants in a river is the cells-in-series model. The model divides a ri...

2 mesi ago

Solved

Local Extrema

Given a 2D (m,n>1) matrix, replace an element if it is not a local extrema (minima/maxima), with 0 (zero). The comparison crite...

2 mesi ago

Solved

Spell musical triads

Chords form the basis of harmony in music. The most basic chords are triads, or groups of three notes. They are specified by thr...

2 mesi ago

Solved

Leyland Primes

A Leyland Number is defined as a number of the form - x^y + y^x, or, x^y - y^x (x,y)>1 Given an array of numbers(>1), check...

2 mesi ago

Solved

Compute the period of a pendulum started from a finite initial angle

Cody Problem 49830 asks for the period of a pendulum swinging through a small angle. Here the pendulum started at rest from an ...

2 mesi ago