For example, in Pythondjango, users a, b, and c each wrote several diaries. How to call users a, b, and c to sort them by the time they wrote their diaries.
12345678910 class User(object): username=models.CharField() xxx pub_date = models.DateTimeField(auto_now_add=True) class Notes (models.Modle): author = models.ForeignKey(User) title = models.CharField() pub_date = models.DateTimeField(auto_now_add = True) body = models.TextField() Two models, how Call the user who has recently written a diary. For example, users a, b, and c have each written several diaries. How to call users a, b, and c and sort them by the time they wrote their diaries.
GoogleCodeJam2014A,B,D
Question A: Water question, if there is only one number in two columns and the number is output repeatedly, if there are more than one, it is bad, if not, it is cheat Question B: I derived a mathematical formula, y(n) = c / 2 + c / (f + 2) + c /(2 * f + 2) + … + c / ((n – 1) * f + 2) + x / (n * f + 2); Then y(n) – y(n – 1 ) After simplification, the denominator is >0, and the numerator is c * n * f + 2 * c – x * f. It can be seen that the function first monotonically decreases and then monotonically increases, requiring minimum n = (x * f – 2 * c) / (c * f) (the minimum of rounding up and rounding down), and then calculate the answer by doing it again Question D: The fraud game is Use Tian Ji’s method of horse racing, just use the regular method in real games Question C: Minesweeper, I haven’t thought of any good method yet, it feels like a structure, if violence can only be used with small data…
go_[“a”,”a”,”b”,”b”,”c”,”c”,”c"
443. Compressed string // jsJSON. parse() methodJSON.stringify() method // javaint[][] ghosts = JSON.parseObject(cin.nextLine(), int[][].class);// goif errJson2 := json.Unmarshal([]byte(targetInput), &target); errJson2 != nil { println(“errJson2:”, errJson2) return } // pythonjson.loads() methodjson.json() method Gives you a character array chars, please use the following algorithm for compression: Start with an empty string s. For each group of consecutively repeated characters in chars: If the group has length 1, append the characters to s. Otherwise, characters need to be appended to s, followed by the length of the group. The compressed string s should not be returned directly, but needs to be dumped into the character array chars. It should be noted that if the group length is 10 or more, it will be split into multiple characters in the chars array. After modifying the input array, please return the new length of the array. You must design and implement an algorithm that uses only constant extra space to solve this problem. Example 1: Input: chars = [“a”,”a”,”b”,”b”,”c”,” c”,”c”]Output: Return 6, the first 6 characters of the input array should be: [“a”,”2″,”b”,”2″,”c”,”3″ ]Explanation:“aa” is replaced by “a2”. “bb” is replaced by “b2”. “ccc” is replaced by “c3”. Example 2: Input: chars = [“a”]Output: Return…
Javaa, b, c three prime numbers, solve the mathematical problem of abc value
The question is as follows: Idea: 1. a, b, c are three prime numbers within 94; 2. The three prime numbers must meet the conditions in the picture; 3. You only need to calculate the prime numbers within 94, and then output the ones that satisfy the two equations in sequence. The code is as follows: import java .util.ArrayList;import java.util.Scanner;//Input a number n and output a prime number within n public class Test { public static void main(String[] args ) { Scanner scanner=new Scanner(System.in); while (scanner.hasNext()) { int n = scanner.nextInt(); Test.sushu( n); } scanner .close(); } public static void sushu(int n){ ArrayList<Integer> a= new ArrayList<Integer> (); // int count=0; for (int i = 1; i <n ; i++) { boolean flag=true;//A sign of whether it is a prime number for (int j = 2; j <=Math.sqrt(i) ; j++) {//If it can be divided except 1 and itself, it means it is not Prime number if (i%j==0){ flag=false ;//Not a prime number } } if(flag){ //count++;//Count the number of prime numbers // System.out.println(“”+count+”prime number”+i); a.add(i); //Store prime numbers within n into array a } } for ( int i = 0; i < a.size( span>); i++) {//Traverse the a array…
Instructions for using javasubstring(a) and substring(a,b)
Function Overview: Briefly introduce the use of substring(a) and substring(a,b) package com.substring.demo; public class test { /** * About the use of substring(a) and substring(a,b) * * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub String num = “0123456789”; String ab1 = num.substring(2, 6); String ab2 = num.substring(1, 8); String a = num.substring(3); System.out.println(“value of ab1:” + ab1); System.out.println(“value of ab2:” + ab2); System.out.println(“value of a:” + a); } } Output results: The value of ab1: 2345 The value of ab2:1234567 The value of a:3456789 Summary: 1. The subscript of the String element in java starts from 0, and substring(a) is intercepted from the a-th character and includes the a-th character. It can be regarded as [ ) in mathematics, indicating an interval that is closed on the left and open on the right 2.substring(a, b) means to intercept the characters whose subscript starts from a and ends with b, including the a-th character but not the b-th character, which can be regarded as [a, b). Supplementary knowledge: Java uses the charAt() method to count repeated characters in a string CharAt() method introduction The charAt() method is used to return the character at the…
Java inputs three numbers a, b, c and outputs them in order of size.
Topic: Input 3 numbers a, b, c, and output them in order of size. Code: import java.util.Scanner; public class lianxi34 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.println(“Please enter 3 integers:”); int a = s.nextInt(); int b = s.nextInt(); int c = s.nextInt(); if(a <b) { int t = a; a = b; b = t; } if(a <c) { int t = a; a = c; c = t; } if(b <c) { int t = b; b = c; c = t; } System.out.println("Output in order from largest to smallest:"); System.out.println(a + " " + b + " " + c); } } The above example of inputting 3 numbers a, b, c in java and outputting them in order of size is all the content shared by the editor. I hope it can give you a reference and I hope you will support it.
The Ruby equivalent of Javascript’s ‘console.log(a,b)’
In Javascript, console.log works as follows: $ node > console.log(1,2) ; console.log(3,4) 1 2 3 4 In Ruby, I want to output the value a, followed by a space, then the value, then the b newline. None of this is satisfactory: $ irb 2.4.1 :001 > print 1,2 ; print 3,4 1234 => nil 2.4.1 :002 > puts 1,2 ; puts 3,4 1 2 3 4 => nil Am I unlucky because I don’t have my own luck? 1> Ursus..: According to the documentation you have to override the field separator and record separator. $, = ” ” # field separator $\ = “\n” # record separator print 3, 5 3 5 nil
Javaa, b, c three prime numbers, solve the mathematical problem of abc value
The question is as follows: Idea: 1. a, b, c are three prime numbers within 94; 2. The three prime numbers must meet the conditions in the picture; 3. You only need to calculate the prime numbers within 94, and then output the ones that satisfy the two equations in sequence. The code is as follows: import java .util.ArrayList;import java.util.Scanner;//Input a number n and output a prime number within n public class Test { public static void main(String[] args ) { Scanner scanner=new Scanner(System.in); while (scanner.hasNext()) { int n = scanner.nextInt(); Test.sushu( n); } scanner .close(); } public static void sushu(int n){ ArrayList<Integer> a= new ArrayList<Integer> (); // int count=0; for (int i = 1; i <n ; i++) { boolean flag=true;//A sign of whether it is a prime number for (int j = 2; j <=Math.sqrt(i) ; j++) {//If it can be divided except 1 and itself, it means it is not Prime number if (i%j==0){ flag=false ;//Not a prime number } } if(flag){ //count++;//Count the number of prime numbers // System.out.println(“”+count+”prime number”+i); a.add(i); //Store prime numbers within n into array a } } for ( int i = 0; i < a.size( span>); i++) {//Traverse the a array…
How to input 3 numbers a, b, c in java and output them in order of size
The editor will share with you how to input three numbers a, b, c in java and output them in order of size. I hope everyone will gain something after reading this article. Let’s discuss it together. Bar! Title: Input 3 numbers a, b, c, and output them in order of size. Code: import java.util.Scanner; public class lianxi34 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.println(“Please enter 3 integers:”); int a = s.nextInt(); int b = s.nextInt(); int c = s.nextInt(); if(a < b) { int t = a; a = b; b = t; } if(a < c) { int t = a; a = c; c = t; } if(b < c) { int t = b; b = c; c = t; } System.out.println("Output in order from largest to smallest:"); System.out.println(a + " " + b + " " + c); } } After reading this article, I believe you have a certain understanding of “How to input 3 numbers a, b, c in java and output them in order of size”. If you want to know more For more related knowledge, welcome to pay attention to the programming notes industry information…
Java defines an array of String type with a length of 4, whose values are {a, b, c, d} and outputs and displays each element.
java defines an array of String type with a length of 4, whose values are {a, b, c, d} and all its elements are output and displayed The code is as follows: public class A04 { public static void main(String args[]) { String[]strings= new String[]{“a”,”b”,”c”,”d”}; for (String string : strings) { System.out.println(string ); } }} How to randomly output a number of length four in java Use an example to illustrate: double d = 345.678; String s = “hello!”; int i = 1234; // “%” means formatted output, and the content after “%” is the definition of the format. System.out.printf(“%f”,d);//”f” means formatted output floating point number. System.out.printf(“%9.2f”,d); //The 9 in “9.2” represents the length of the output, and the 2 represents the number of digits after the decimal point. System.out.printf(“%+9.2f”,d);//”+” means the output number has a positive or negative sign. System.out.printf(“%-9.4f”,d); //”-” means the output number is left-aligned (default is right-aligned). System.out.printf(“%+-9.3f”,d);//”+-” means that the output number is signed and left-aligned. System.out.printf(“%d”,i);//”d” means output decimal integer. System.out.printf(“%o”,i);//”o” means output octal integer. System.out.printf(“%x”,i);//”d” means outputting a hexadecimal integer. System.out.printf(“%#x”,i);//”d” means outputting an integer with a hexadecimal flag. System.out.printf(“%s”,s); //”d” represents the output string. System.out.printf(“Output a floating point number: %f, an integer:…
