If R contains an odd number of items, the extra one is in the first half and goes on the end of the resulting list. Using the mutable rlist abstraction, implement a destructive filter function: Analogously, a hailstone travels up and down in the atmosphere before eventually landing on earth. The max function can take an arbitrary number of arguments. An operation is nondestructive if the state of the input objects is unchanged, and the operation creates entirely new objects to represent its result.

Riffle shuffling combines two sequences by interleaving themalternately including one item from one sequence and one from the next. Therefore, even if c returns False , the function t will be called. In pre-Python 3 days, there was no nonlocal statement. Empty cells that had exactly three occupied neighbors becomes occupied. The number of x’s in each row must be equal. The number n will travel up and down but eventually end at 1 at least for all numbers that have ever been tried — nobody has ever proved that the sequence will terminate. If R contains an odd number of items, the extra one is in the first half and goes on the end of the resulting list.

The answer is short, and doesn’t even need a loop.: Mutable Rlists Rlists cs611a presented so far are immutable. Therefore, even if c returns Falsethe function t will be called. In the second, do everything in one statement with slicing.

An operation is destructive if it sometimes changes the state of some of the input objects, so that a client can’t count on the original input values remaining around except by maintaining copies.

The number of x’s in homeework row must be equal. Use only a single line for himework body of the function. If you are having a hard time identifying how the if statement and if function differ, first try to get them to print out different values. At the beginning of each turn, organisms in occupied cells die and organisms are born into unoccupied cells according to the following rules:.

## 61A Homework 5

In the first one, use only assignments to individual list elements do not use slicing. We choose the operator add or sub based on the sign of b. The resulting list starts with the first item of R, then the middle item, then the second item, then the item after the middle, etc. Variations of the game treat the edges of the board in various ways: Write a function that takes three positive numbers and returns the sum of the squares of the two largest numbers. If R contains an odd number of items, the extra one is in the first half and goes on the end of the resulting list.

Write a function that takes an integer n that is greater than 1 and returns the largest integer that is smaller than n and evenly divides n.

In both cases, do not create any new lists no list displays, generators, applications of listetc. The terms “destructive” and “nondestructive” describe the effects of hoemwork operation on the states of the objects that provide input. As in lecture, an account will be represented as a function:.

## CS61A Homework 05

Write two functions that reverse the contents of a list as a side effect. The Python class Life cs661a the hw5. An operation is nondestructive cw61a the state of the input objects is unchanged, and the operation creates entirely new objects to represent its result. The number n will travel up and down but eventually end at 1 at least for all numbers that have ever been tried — nobody has ever proved that the sequence will terminate.

These are destructive operations Despite the doctests above, this function actually does not do the same thing as an if statement in all cases.

This sequence of values of n is often called a Hailstone sequence, Write a function that takes a single argument with formal parameter name nprints out the hailstone sequence starting at nand returns the number of steps in the sequence:.

So, we can take the max of the sum cw61a squares of all pairs. Iterating from n-1 to 1, we return the first integer that evenly divides n. Using ordinary Python lists, implement c61a nondestructive shuffle.

# Homework 1 Solutions | CS 61A Summer

Other empty cells remain empty. Fill in the blanks in the following function definition for adding a to the absolute value of bwithout calling abs.

With a nondestructive operation, the original input values generally remain intact.

Using the mutable rlist abstraction, implement a destructive filter function:. Consider now an extension of rlist to make it mutable:.

You can grab a template for this homework either by downloading the file from the calendar or by running the following command in terminal on one of the school computers the dot is significant: The max homwwork can take an arbitrary number of arguments.