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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 printN(Node *a){
  42.     if(a == NULL) printf("NULL\n");
  43.     else printf("%d\n",a->val);
  44. }
  45.  
  46. void printL(){
  47.     Node *p = head;
  48.     while(p != NULL){
  49.         printf("%d ",p->val);
  50.         p = p->next;
  51.     }
  52.     printf("\n");
  53. }
  54.  
  55. Node* getN(int n){
  56.     int i;
  57.     Node *p;
  58.     p = head;
  59.     for(i=1;i<n;i++) p = p->next;
  60.     return p;
  61. }
  62.  
  63. int countL(){
  64.     int ret = 0;
  65.     Node *p = head;
  66.     while(p!=NULL){
  67.         p = p->next;
  68.         ret++;
  69.     }
  70.     return ret;
  71. }
  72.  
  73. Node* searchX(int x){
  74.     Node *p;
  75.     for(p=head; p!=NULL; p=p->next){
  76.         if(p->val == x) break;
  77.     }
  78.     return p;
  79. }
  80.  
  81. void insHead(int x){
  82.     Node *p;        //１
  83.     p = createN(x); //１
  84.     p->next = head; //２
  85.     head = p;       //３
  86. }
  87.  
  88. void insMiddle(int n, int x){
  89.     int i;
  90.     Node *p,*q;
  91.     p = head;           //１
  92.     for(i=1;i<n;i++){   //２
  93.         p = p->next;    //２
  94.     }
  95.     q = createN(x);     //３
  96.     q->next = p->next;  //４
  97.     p->next = q;        //５
  98. }
  99.  
  100. void insTail(int x){
  101.     Node *p;
  102.     p = head;               //１
  103.     if(p==NULL){
  104.         head = createN(x);
  105.         return;
  106.     }
  107.     while(p->next != NULL){ //２
  108.         p = p->next;        //２
  109.     }
  110.     p->next = createN(x);   //３
  111. }
  112.  
  113. void delHead(){
  114.     Node *p;
  115.     p = head;           //１
  116.     head = head->next;  //２
  117.     free(p);            //３
  118. }
  119.  
  120. void delMiddle(int n){
  121.     int i;
  122.     Node *p,*q;
  123.     p = head;           //１
  124.     for(i=1;i<n-1;i++){ //２
  125.         p = p->next;    //２
  126.     }
  127.     q = p->next;        //３
  128.     p->next = q->next;  //４
  129.     free(q);            //５
  130. }
  131.  
  132. void delTail(){
  133.     Node *p;
  134.     p = head;                       //１
  135.     while(p->next->next != NULL){   //２
  136.         p = p->next;                //２
  137.     }
  138.     free(p->next);                  //３
  139.     p->next = NULL;                 //４
  140. }
  141.  
  142. void delX(int x){
  143. 	int i=1;
  144. 	Node *p;
  145. 	for(p=head;p!=NULL;p=p->next){
  146. 		if(x==p->val) break;
  147. 		i++;
  148. 	}
  149. 	if(p==NULL) return ;
  150. 	else if(i==1) delHead();
  151. 	else if(i==countL());
  152. 	else delMiddle(i);
  153. }
  154.  
  155. int main(void){
  156.     int i,n,x;
  157.     scanf("%d",&n);
  158.     initL(n);
  159.     scanf("%d",&x);
  160.     delX(x);
  161.     printL();
  162.     freeL();
  163.     return 0;
  164. }
Success #stdin #stdout 0s 5292KB
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https://ideone.com/Cdd4in
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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