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Jan 26, 2010 · Step 2. Increment the start index decrement the end index. Step 3. Iterate Step 1 and Step 2 till start index < end index. For this, the time complexity will be O (n) and the space complexity will be O (1) Sample code for reversing an array in space is like: public static int[] reverseAnArrayInSpace(int[] array) {.
Apr 9, 2011 · The following will reverse in place the array between indexes i and j (to reverse the whole array call reverse(a, 0, a.length - 1)) public void reverse(int[] a, int i , int j) {. int ii = i; int jj = j; while (ii < jj) {. swap(ii, jj); ++ii; --jj; I like this answer because it avoids calling the .length method inside the loop and doesn't ...
Nov 20, 2012 · Store these values in an array and print the array. Then reverse the array elements so that the first element becomes the last element, the second element becomes the second to last element, and so on, with the old last element now first. Do not just reverse the order in which they are printed; actually change the way they are stored in the array.
1) How to apply recursive call for this method. for the original, the method is : reverse(int[] a). so, after first step, you should create array b from a[2] --> a[n-1]. and using reverse (int [] b)`. 2) after reverse b, what should we do to reverse a ? Assign values of b again back to a.
Apr 3, 2012 · 2. you can do it without needing a temp array. loop from the beginning (or end doesn't matter) to the middle of the array. swap element with element at (last element - index) (so 0 and size - 1, 1 and size - 2 etc) you'll do something like this to swap: temp = a[i]; a[i] = a[end-i]; a[end-i] = temp; repeat.
Sep 10, 2017 · System.out.println("Reverse Stream as String : "+ reverseString); return reverseString; } Using a Traditional for Loop. If you want to reverse the string then we need to follow these steps. Convert String into an Array of Characters. Iterate over an array in reverse order, append each Character to temporary string variable until the last character.
Apr 7, 2011 · The first thing is that the code is not followed the standards of JAVA language. Class name should always starts with UPPER case, and sort() of Arrays should not take primitive list of values as a parameter. change the 'char' to 'Character' and then use Arrays.sort method
Nov 7, 2014 · To reverse the array you only have to iterate half of the array and start swapping the element from start with end. swap element (position from start) with element (end position - position from start) String temp = reverse[i]; reverse[i] = reverse[reverse.length - 1 - i]; reverse[reverse.length - 1 - i] = temp;
May 26, 2012 · One can modify the list in place, create a copy in reverse order, or create a view in reversed order. The simplest way, intuitively speaking, is Collections.reverse: Collections.reverse(myList); This method modifies the list in place. That is, Collections.reverse takes the list and overwrites its elements, leaving no unreversed copy behind.
import java.util.Collections; import java.util.List; public void reverseTest(List<Integer> sampleCollection) { Collections.reverse(sampleCollection); // remember this reverses the elements in the list, so if you want the original input collection to remain untouched clone it first.
