1 int vec_rotate(char *vec,int rotdist, int length) { 2 int i,j,k,times; 3 char t; 4 times = gcd(rotdist,length); 5  printf("%d\n",times); 6 for(i=0;i<times;i++) { 7  t = vec[i]; 8   j = i; 9    while(1) {10  k = j+ rotdist;11  if(k>=length)12   k-=length;13  if(k==i)14 break;15  vec[j] = vec[k];16 j = k;17 }18  vec[j]=t;19     }20     return 0;21 }22 23 向量左旋算法1:"杂技"代码