{"id":509,"date":"2021-07-13T17:39:53","date_gmt":"2021-07-13T17:39:53","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=509"},"modified":"2021-09-13T06:23:08","modified_gmt":"2021-09-13T06:23:08","slug":"delete-all-occurrences-of-a-given-key-in-a-linked-list","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/data-structure\/delete-all-occurrences-of-a-given-key-in-a-linked-list\/","title":{"rendered":"Delete all occurrences of a given key in a linked list ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"delete-all-occurrences-of-a-given-key-in-a-linked-list\" class=\"color-pink\">Delete all occurrences of a given key in a linked list ?<\/h2>\n<\/div>\n<\/div>\n<div class=\"CodeContent\">\n<div class=\"hddn\">\n<ul>\n<li>Given a\u00a0singly linked list, delete all occurrences of a given key in it. For example,<\/li>\n<\/ul>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-markdown code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-markdown code-embed-code\">Input:  2 -> 1 -> 8 -> 2 ->  3 ->  2 -> 7<br\/>       Key to delete = 2<br\/>Output:  1 -> 8 -> 3 -> 7 <\/code><\/pre> <\/div>\n<h2 id=\"sample-code-in-c\" class=\"color-purple\">Sample Code in C<\/h2>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-c code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-c code-embed-code\">#include <stdio.h> <br\/>#include <stdlib.h> <br\/>\/\/ A linked list node <br\/>struct Node <br\/>{ <br\/>    int data; <br\/>    struct Node *next; <br\/>}; <br\/>\/* Given a reference (pointer to pointer) to the head of a list <br\/>   and an int, inserts a new node on the front of the list. *\/<br\/>void push(struct Node** head_ref, int new_data) <br\/>{ <br\/>    struct Node* new_node = (struct Node*) malloc(sizeof(struct Node)); <br\/>    new_node->data  = new_data; <br\/>    new_node->next = (*head_ref); <br\/>    (*head_ref)    = new_node; <br\/>} <br\/>\/* Given a reference (pointer to pointer) to the head of a list and <br\/>   a key, deletes all occurrence of the given key in linked list *\/<br\/>void deleteKey(struct Node **head_ref, int key) <br\/>{ <br\/>    \/\/ Store head node <br\/>    struct Node* temp = *head_ref, *prev; <br\/>    \/\/ If head node itself holds the key or multiple occurrences of key <br\/>    while (temp != NULL && temp->data == key) <br\/>    { <br\/>        *head_ref = temp->next;   \/\/ Changed head <br\/>        free(temp);               \/\/ free old head <br\/>        temp = *head_ref;         \/\/ Change Temp <br\/>    } <br\/>    \/\/ Delete occurrences other than head <br\/>    while (temp != NULL) <br\/>    { <br\/>        \/\/ Search for the key to be deleted, keep track of the <br\/>        \/\/ previous node as we need to change &#039;prev->next&#039; <br\/>        while (temp != NULL && temp->data != key) <br\/>        { <br\/>            prev = temp; <br\/>            temp = temp->next; <br\/>        } <br\/>        \/\/ If key was not present in linked list <br\/>        if (temp == NULL) return; <br\/>        \/\/ Unlink the node from linked list <br\/>        prev->next = temp->next; <br\/>        free(temp);  \/\/ Free memory <br\/>        \/\/Update Temp for next iteration of outer loop <br\/>        temp = prev->next; <br\/>    } <br\/>} <br\/>\/\/ This function prints contents of linked list starting from <br\/>\/\/ the given node <br\/>void printList(struct Node *node) <br\/>{ <br\/>    while (node != NULL) <br\/>    { <br\/>        printf(&quot; %d &quot;, node->data); <br\/>        node = node->next; <br\/>    } <br\/>} <br\/>   \/* Drier program to test above functions*\/<br\/>int main() <br\/>{ <br\/>    \/* Start with the empty list *\/<br\/>    struct Node* head = NULL; <br\/>    push(&head, 7); <br\/>    push(&head, 2); <br\/>    push(&head, 3); <br\/>    push(&head, 2); <br\/>    push(&head, 8); <br\/>    push(&head, 1); <br\/>    push(&head, 2); <br\/>    push(&head, 2); <br\/>    int key = 2; \/\/ key to delete <br\/>    puts(&quot;Created Linked List: &quot;); <br\/>    printList(head); <br\/>    deleteKey(&head, key); <br\/>    puts(&quot;\\nLinked List after Deletion: &quot;); <br\/>    printList(head); <br\/>    return 0; <br\/>}<\/code><\/pre> <\/div>\n<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"output\" class=\"color-purple\">Output<\/h2>\n<\/div>\n<\/div>\n<div class=\"Output\">\n<div class=\"hddn\">\n<figure class=\"highlight\">\n<pre><code class=\"hljs\" data-lang=\"\"><span class=\"nt\">Created Linked List:\r\n 2  2  1  8  2  3  2  7\r\nLinked List after Deletion:\r\n 1  8  3  7 <\/span><\/code><\/pre>\n<\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : Given a singly linked list, delete all occurrences&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3028],"tags":[195,971,491,221,368,3494,203,199,214,198,363,3057,3601,3290,3292,3496,3289,3603,3602,3503,3286,205,3604,222,484,3054,196,212,207,366,204,3605,15925,206,972,200,3055,197,968,3056,3600,3606,3599,285,969],"class_list":["post-509","post","type-post","status-publish","format-standard","hentry","category-data-structure","tag-accenture-interview-questions-and-answers","tag-altimetrik-india-pvt-ltd-interview-questions-and-answers","tag-applied-materials-interview-questions-and-answers","tag-bharti-airtel-interview-questions-and-answers","tag-bmc-software-interview-questions-and-answers","tag-c-program-to-delete-first-node-in-linked-list","tag-capgemini-interview-questions-and-answers","tag-casting-networks-india-pvt-limited-interview-questions-and-answers","tag-cgi-group-inc-interview-questions-and-answers","tag-chetu-interview-questions-and-answers","tag-ciena-corporation-interview-questions-and-answers","tag-collabera-te-interview-questions-and-answers","tag-delete-a-specific-node-in-linked-list-java","tag-delete-all-nodes-in-doubly-linked-list-c","tag-delete-at-position-in-a-doubly-linked-list","tag-delete-first-node-in-linked-list-c","tag-delete-last-node-in-doubly-linked-list-in-c","tag-delete-last-node-in-linked-list-c","tag-delete-last-node-in-linked-list-in-c","tag-delete-node-at-given-position-in-a-linked-list-in-c","tag-delete-node-from-doubly-linked-list-java","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-doubly-linked-list-geeksforgeeks","tag-flipkart-interview-questions-and-answers","tag-genpact-interview-questions-and-answers","tag-globallogic-india-pvt-ltd-interview-questions-and-answers","tag-ibm-interview-questions-and-answers","tag-indecomm-global-services-interview-questions-and-answers","tag-mphasis-interview-questions-and-answers","tag-netapp-interview-questions-and-answers","tag-oracle-corporation-interview-questions-and-answers","tag-remove-element-from-doubly-linked-list-c","tag-samsung-interview-questions-and-answers","tag-sap-labs-india-pvt-ltd-interview-questions-and-answers","tag-sapient-consulting-pvt-ltd-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-tracxn-technologies-pvt-ltd-interview-questions-and-answers","tag-unitedhealth-group-interview-questions-and-answers","tag-wipro-infotech-interview-questions-and-answers","tag-wm-global-technology-services-india-pvt-ltd-limited-wmgts-interview-questions-and-answers","tag-write-a-program-to-delete-a-node-from-linked-list-in-c","tag-write-ac-program-to-delete-a-particular-element-in-the-doubly-linked-list","tag-write-an-algorithm-to-delete-duplicate-elements-in-a-singly-linked-list","tag-xoriant-solutions-pvt-ltd-interview-questions-and-answers","tag-yodlee-infotech-pvt-ltd-interview-questions-and-answers"],"yoast_head":"<!-- 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