Mẹo về Linear search using recursion in python 2022
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Nội dung chính- How do you use recursion in linear search?What is linear recursion in Python?How do you code a linear search in Python?What is linear and binary search in Python?
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Given an unsorted array and an element x, search x in the given array. Write recursive C code for this. If the element is not present, return -1.
Approach : The idea is to compare x with the last element in arr[]. If the element is found the last position, return it. Else recur searchElement() for remaining array and element x.
C++
#include
using namespace std;
int searchElement(int arr[], int size, int x)
size--;
if (size < 0)
return -1;
if (arr[size] == x)
return size;
return searchElement(arr, size, x);
int main()
int arr[] = 17, 15, 11, 8, 13, 19;
int size = sizeof(arr) / sizeof(arr[0]);
int x = 11;
int idx = searchElement(arr, size, x);
if (idx != -1)
cout << "Element " << x << " is present index " < else cout << "Element " << x << " is not present in the array"; return
0; #include int elmntSrch(int arr[], int size, int x) int rec; size--; if (size >= 0) if (arr[size] == x) return size; else rec = elmntSrch(arr, size, x); else return -1; return rec; int
main(void) int arr[] = 12, 34, 54, 2, 3; int size = sizeof(arr) / sizeof(arr[0]); int x = 3; int indx; indx = elmntSrch(arr, size, x); if (indx != -1) printf("Element %d is present index %d", x, indx); else printf("Element %d is not present", x); return 0; class Test
static int arr[] = 12, 34, 54, 2, 3; static int recSearch(int arr[], int l, int r, int x) if (r < l) return -1; if (arr[l] == x) return l; if (arr[r] == x) return r; return
recSearch(arr, l+1, r-1, x); public static void main(String[] args) int x = 3; int index = recSearch(arr, 0, arr.length-1, x); if (index != -1) System.out.println("Element " + x + " is present index " + index); else System.out.println("Element " + x + " is not present");
def recSearch( arr, l, r, x): if r < l: return -1 if arr[l] == x: return l if arr[r] == x: return r return recSearch(arr, l+1, r-1, x) arr =
[12, 34, 54, 2, 3] n = len(arr) x = 3 index = recSearch(arr, 0, n-1, x) if index != -1: print ("Element", x,"is present index %d" %(index)) else: print ("Element %d is not present" %(x)) using System; static class Test static int []arr = 12, 34, 54, 2, 3; static int recSearch(int []arr, int l, int r, int x) if (r < l) return -1; if (arr[l] == x) return l; if (arr[r] == x) return r; return
recSearch(arr, l+1, r-1, x); public static void Main(String[] args) int x = 3; int index = recSearch(arr, 0, arr.Length-1, x); if (index != -1) Console.Write("Element " + x + " is present index " + index); else Console.Write("Element " + x + " is not present"); function recSearch($arr, int $l, int $r, int $x) if ($r < $l) return -1; if ($arr[$l] == $x) return $l; if ($arr[$r] == $x) return $r; return
recSearch($arr, $l+1, $r-1, $x); $arr = array(12, 34, 54, 2, 3); $i; $n = count($arr); $x = 3; $index = recSearch($arr, 0, $n - 1, $x); if ($index != -1) echo "Element"," ", $x," ", "is present index ", $index;
else echo "Element is not present", $x; ?> Output Explanation We iterate through the array from the end by decrementing the size variable and recursively calling the function searchElement(). If the size variable becomes less
than zero it means the element is not present in the array and we return -1. If a match is found, we return the size variable which is the index of the found element. This process is repeated until a value is returned to main(). It is important to note that if there are duplicate elements in the array, the index of the last matched element will be returned since we are (recursively) iterating the array from the end. Time Complexity: O(N), where N is the size of the
given array. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed aboveC
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Auxiliary Space: O(1)
How do you use recursion in linear search?
The program output is also shown below.. /* C Program to implement Linear Search Algorithm recursively */. #include What is linear recursion in Python?
A linear recursive function is a function that only makes a single call to itself each time the function runs (as opposed to one that would call itself multiple times during its execution). The factorial function is a good example of linear recursion.
How do you code a linear search in Python?
Python Program. def linear_Search(list1, n, key):. # Searching list1 sequentially.. for i in range(0, n):. if (list1[i] == key):. return i.. return -1.. list1 = [1 ,3, 5, 4, 7, 9]. key = 7..
What is linear and binary search in Python?
Linear search is a search that finds an element in the list by searching the element sequentially until the element is found in the list. On the other hand, a binary search is a search that finds the middle element in the list recursively until the middle element is matched with a searched element.
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