约瑟夫环，指针实现

 1 #include <iostream>
 2 #include <stdio.h>
 3 #include <stdlib.h>
 4 
 5 using namespace std;
 6 
 7 typedef struct Node
 8 {
 9     int Id;
10     struct Node * Next;
11 } NODE;
12 
13 int main()
14 {
15 
16     int n, m;
17 
18     scanf("%d %d", &n, &m);
19 
20     NODE *head, *p, *q;
21     head = (NODE *)malloc(sizeof(NODE));
22 
23     head->Id = 1;
24     head->Next = NULL;
25 
26     q = head;
27     for(int i=2; i<=n; i++)
28     {
29         p = (NODE*)malloc(sizeof(NODE));
30         p->Id = i;
31         p->Next = NULL;
32         q->Next = p;
33         q = q->Next;
34     }
35     q->Next = head;
36 
37     p = head;
38 
39     while(p!=p->Next)
40     {
41         for(int cnt=1; cnt<=m-1; cnt++)
42         {
43             q = p;
44             p = p->Next;
45         }
46         q->Next = p->Next;
47         //printf("%d ", p->Id);
48         NODE* t = p;
49         p = p->Next;
50         free(t);
51     }
52     printf("%d
", p->Id);
53 
54     return 0;
55 }
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