给定N张扑克牌和一个随机函数，设计一个洗牌算法

#include 
#include 
using namespace std;

void swap(int &a, int &b){
	int t = a;
	a = b;
	b = t;
}

void randomShuffle(int a[], int n){
	for(int i = 0; i < n; ++i){
		int j = rand() % (n - i) + i;
		swap(a[i], a[j]);
	}
}

int main(){
	srand((unsigned)time(NULL));
	int n = 9;
	int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
	randomShuffle(a, n);
	for(int i = 0; i < n; ++i)
		cout << a[i] << endl;
	return 0;
}