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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct node {
  5.     int val;
  6.     struct node *next;
  7. }Node;
  8.  
  9. Node *head = NULL;
  10.  
  11. Node* createN(int x){
  12.     Node *newnode;
  13.     newnode = (Node *)malloc(sizeof(Node));
  14.     newnode->val = x;
  15.     newnode->next = NULL;
  16.     return newnode;
  17. }
  18.  
  19. void initL(int n){
  20.     int x,i;
  21.     Node *p;
  22.     scanf("%d",&x);
  23.     head = createN(x);
  24.     p = head;
  25.     for(i=1;i<n;i++){
  26.         scanf("%d",&x);
  27.         p->next = createN(x);
  28.         p = p->next;
  29.     }
  30. }
  31.  
  32. void freeL(){
  33.     Node *p;
  34.     while(head!=NULL){
  35.         p = head->next;
  36.         free(head);
  37.         head = p;
  38.     }
  39. }
  40.  
  41. void printL(){
  42.     Node *p = head;
  43.     while(p != NULL){
  44.         printf("%d ",p->val);
  45.         p = p->next;
  46.     }
  47.     printf("\n");
  48. }
  49.  
  50.  
  51. void insMiddle(int n, int x){
  52.     int i;
  53.     Node *p,*q;
  54.     p = head;           // 1
  55.     for(i=1;i<n;i++){   // 2
  56.         p = p->next;    // 2
  57.     }
  58.     q = createN(x);     // 3
  59.     q->next = p->next;  // 4
  60.     p->next = q;        // 5
  61. }
  62.  
  63. void delMiddle(int n){
  64.     int i;
  65.     Node *p,*q;
  66.     p = head;           // 1
  67.     for(i=1;i<n-1;i++){ // 2
  68.         p = p->next;    // 2
  69.     }
  70.     q = p->next;        // 3
  71.     p->next = q->next;  // 4
  72.     free(q);            // 5
  73. }
  74.  
  75.  
  76. int main(void){
  77.     int i,n,y1,x1,y2;
  78.     scanf("%d",&n);
  79.     initL(n);
  80.     printL();
  81.     scanf("%d %d",&y1,&x1);
  82.     insMiddle(y1,x1);
  83.     printL();
  84.     scanf("%d",&y2);
  85.     delMiddle(y2);
  86.     printL();
  87.     freeL();
  88.     return 0;
  89. }
Success #stdin #stdout 0.01s 5296KB
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https://ideone.com/5fykX4
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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