All about coding, algos, puzzles and big data Friday, December 14, Sort a very large text file on limited memory Problem We are given a very large text file of size say 10 GB and we need to sort the file and store it in an output location. Brute-Force Approach Read the input file line by line using BufferedReader and store each line in a TreeSet assume there are no duplicate lines. Once the file is completely read, store the contents of the TreeSet into the output file. For my analysis, I used a MB file containing line items.
These are called scripts. Lines in the file are run as if they were typed at the keyboard. There are a few extra commands that are only useful in scripts: A at the start of any line is a comment -- the line is ignored but! As usual with inputs, extra spaces are ignored. To keep echo on the same line, use the -n option: Parameters not entered can be used, and are "" no letters.
It is all of the inputs, with spaces between them. It is mostly useful to have a for loop later look at all inputs. It can also be useful in loops: It is the only way the script can tell the letter a from the contents of box a.
This can make new words, that are checked in the normal way. You can do some strange tricks with this, such as putting two things together to make a command, or a pathname: It can be useful for assigning variables, and, later, is useful in loops: The else is optional.
Indentation is just to make it look nice. Errors if test stuff. Brackets are a shorthand for the test command but they need spaces around them.
In divide and conquer approach, the problem in hand, is divided into smaller sub-problems and then each problem is solved independently. When we keep on dividing the subproblems into even smaller sub-problems, we may eventually reach a stage where no more division is possible. Linear search is a very simple search algorithm. In this type of search, a sequential search is made over all items one by one. Every item is checked and if a match is found then that particular item is returned, otherwise the search continues till the end of the data collection. 1. Selection sort algorithm sort data by comparing one element to every other element and decide its position. 2. The time complexity of this algorithm is O(n^2).
Many people prefer to combine the if and then using a semicolon. Oddly, then may not have a semi colon after it: An if may be nested inside another if, following the same rules. This checks whether both inputs are files: An if does not need a test command after it.
The if really just runs the next command and checks the "exit status. For examples, test 5 -gt 8 has an exit status of 1 which means false, test -d "WWW" might have an exit status of 0 there is a WWW dir, cat a.Then use a function called selection_sort, when given an array with n elements, the function must sort the array from smallest to largest values.
Write a C program with a separate function which calculates the sine function from the first principles according to the formula below. The code should find the sine value in 5 stages and then. Dynamic Programming 2 Weighted Activity Selection Weighted activity selection problem (generalization of CLR ).
Job requests 1, 2, , N. Job j starts at s j, finishes at f, and has weight w.
Two jobs compatible if they don't overlap. Goal: find maximum weight subset of mutually compatible jobs. Time 0 A C F B D G E THE FALSE ALLURE OF GROUP SELECTION. Human beings live in groups, are affected by the fortunes of their groups, and sometimes make sacrifices that benefit their groups.
1 Answer to Which method runs faster for an array in reverse order, selection sort or insertion sort? - » /*** Below is the complete program and sample output in the end.
I have used my own bitonic array. You can use whichever biotonic array you want. ust change the elements in . Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or .
The OUTREC control statement supports a wide variety of parsing, editing, and reformatting tasks, including. The use of fixed position/length fields or variable position/length fields.
For fixed fields, you specify the starting position and length of the field directly.