generator-vview hview

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Graphs: Dijkstra's Algorithm ccc

https://www.youtube.com/watch?v=8Ls1RqHCOPw


http://www.cemc.uwaterloo.ca/contests/past_contests.html

java-sort

source :

http://mathbits.com/MathBits/Java/arrays/SelectionSort.htm

Array at beginning:	84	69	76	86	94	91
After Pass #1:	84	91	76	86	94	69
After Pass #2:	84	91	94	86	76	69
After Pass #3:	86	91	94	84	76	69
After Pass #4:	94	91	86	84	76	69
After Pass #5 (done):	94	91	86	84	76	69

While being an easy sort to program, the selection sort is one of the least efficient.  The algorithm offers no way to end the sort early, even if it begins with an already sorted list.   // Selection Sort Method for Descending Orderpublic static void SelectionSort ( int [ ] num ) {      int i, j, first, temp;       for ( i = num.length - 1; i > 0; i - - )       {           first = 0;   //initialize to subscript of first element           for(j = 1; j <= i; j ++)   //locate smallest element between positions 1 and i.           {                if( num[ j ] < num[ first ] )                           first = j;           }           temp = num[ first ];   //swap smallest found with element in position i.           num[ first ] = num[ i ];           num[ i ] = temp;       }           }

 

Programing

Java Selection

Selection Sort

Java Repetition

recursion

Graph Search Implementation graph search wiki

Scanner in = new Scanner(System.in); int next = in.nextInt();

Convert int[] into ArrayList

*****************************************
* String Array to Array List ******************
*****************************************

http://www.tutorialspoint.com/java/util/arrays_aslist.htm

Example

The following example shows the usage of java.util.Arrays.asList() method.

package com.tutorialspoint;

import java.util.Arrays;
import java.util.List;

public class ArrayDemo1 {
   public static void main (String args[]) {

   // create an array of strings
   String a[] = new String[]{"abc","klm","xyz","pqr"};
   
   List list1 = Arrays.asList(a);

   // printing the list
   System.out.println("The list is:" + list1);
   }
}

Let us compile and run the above program, this will produce the following result:

The list is:[abc, klm, xyz, pqr]

http://stackoverflow.com/questions/10530353/convert-string-array-to-arraylist

import java.util.Arrays;  
import java.util.List;  
import java.util.ArrayList;  
public class StringArrayTest  
{  
   public static void main(String[] args)  
   {  
      String[] words = {"ace", "boom", "crew", "dog", "eon"};  

      List<String> wordList = Arrays.asList(words);  

      for (String e : wordList)  
      {  
         System.out.println(e);  
      }  
   }  
}

**********************************
* Array List to string array ************
**********************************

List<String> stockList = new ArrayList<String>();
stockList.add("stock1");
stockList.add("stock2");

String[] stockArr = new String[stockList.size()];
stockArr = stockList.toArray(stockArr);

for(String s : stockArr)
    System.out.println(s);

****************************************************************
************** Array List to Integer * *******************************
****************************************************************

http://www.tutorialspoint.com/java/util/arraylist_get.htm

Example

The following example shows the usage of java.util.ArrayList.get() method.

package com.tutorialspoint;

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String[] args) {
      
   // create an empty array list with an initial capacity
   ArrayList<Integer> arrlist = new ArrayList<Integer>(5);

   // use add() method to add elements in the list
   arrlist.add(15);
   arrlist.add(22);
   arrlist.add(30);
   arrlist.add(40);

   // let us print all the elements available in list
   for (Integer number : arrlist) {
   System.out.println("Number = " + number);
   } 
 
   // retrieves element at 4th postion
   int retval=arrlist.get(3);
   System.out.println("Retrieved element is = " + retval);    
   }
}   

Let us compile and run the above program, this will produce the following result:

Number = 15
Number = 22
Number = 30
Number = 40
Retrieved element is = 40

***********************************************************
*  int list to int[] *********************************************
***********************************************************
https://www.blogger.com/blogger.g?blogID=5452307390516932808#editor/target=post;postID=4395252080140059040

private int[] buildIntArray(List<Integer> integers) {
    int[] ints = new int[integers.size()];
    int i = 0;
    for (Integer n : integers) {
        ints[i++] = n;
    }
    return ints;
}

http://stackoverflow.com/questions/10269300/convert-int-into-arraylist

List<Integer> list = Arrays.asList(1, 2, 3);

So something along the lines of:

int[] array = { 1, 2, 3 };
ArrayList<Integer> list = new ArrayList<Integer>(array.length);
for (int i = 0; i < array.length; i++)
  list.add(Integer.valueOf(array[i]));