不重复随机序列

#include <iostream>
#include <time.h>
#include <stdlib.h>
using namespace std;

int random(int a,int b)
{
    srand(NULL);
    return rand()%(b-a)+a;
}

void exchange(int &a,int &b)
{
    int temp;
    temp=a;
    a=b;
    b=temp;
}

int main()
{
    int a[]={1,2,3,4,5,6,7,8,9,10,11,12,13,14};
    int length=sizeof(a)/sizeof(int);
    for (int i=0;i<length;i++)
    {
        exchange(a[i],a[random(i,length)]);
    }

    for (int i=0;i<length;i++)
    {
        cout<<a[i]<<"";
    }    
    system("pause");
    return 0;
}