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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. void delX(int x){
  51.     Node *p = head;
  52.     Node *prev = NULL;
  53.  
  54.     while(p != NULL){
  55.         if(p->val == x){
  56.             if(p == head){ // 頭の要素を削除
  57.                 head = p->next;
  58.                 free(p);
  59.                 p = head;
  60.             } else {
  61.                 prev->next = p->next;
  62.                 free(p);
  63.                 p = prev->next;
  64.             }
  65.         } else {
  66.             prev = p;
  67.             p = p->next;
  68.         }
  69.     }
  70. }
  71.  
  72. int main(void){
  73.     int n, x;
  74.     scanf("%d", &n);  // ノード数
  75.     initL(n);         // リスト作成
  76.     scanf("%d", &x);  // 削除対象の値
  77.     delX(x);          // ノード削除
  78.     printL();         // 結果表示
  79.     freeL();          // メモリ解放
  80.     return 0;
  81. }
  82.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/A4R2VQ
language:
C99 (gcc 8.3)
created:
1 day ago
visibility:
public

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