【编程珠玑】生成k个1-n的随机数

/*==========================================================*\| gen $1 distinct integers from U[0,$2)\*==========================================================*/#define MAXN 2000000int x[MAXN];int randint(int a, int b){return a + (RAND_MAX * rand() + rand()) % (b + 1 - a);}int main(int argc, char *argv[]){int i, k, n, t, p;srand((unsigned)time(NULL));k = atoi(argv[1]);n = atoi(argv[2]);for (i = 0; i < n; i++)x[i] = i;for (i = 0; i < k; i++) {p = randint(i, n-1);swap(x[i], x[p]);printf("%d\n", x[i]);}return 0;}