vector<int> getRandom(int total){  srand((int)time(NULL));  std::vector<int> input = *new std::vector<int>();  for (int i = 0; i < total; i++) {    input.push_back(i);  }  vector<int> output = *new vector<int>();     int end = total;  for (int i = 0; i < total; i++) {    vector<int>::iterator iter = input.begin();    int num = random()%end;    iter = iter+num;    output.push_back(*iter);    input.erase(iter);    end--;  }     return output;}

void permutation(int n, int *z_array){  int i, j, k, z;  int buffer[N];  /* 初始化數組 */  for (i=0; i<n; i++)    buffer[i]=0;  /* 準備生成隨機數,以當前時間為種子 */  srand((unsigned)time((long *)0));  /* 獲得不重復的隨機數據 */  for (i=0; i<n; i++) {    /* 獲得0~（n-i）的隨機數據 */    z = rand()%(n-i);    j=0; k=0;    while (j<=z) {      if (buffer[j+k]==0) j++;      else k++;    }    buffer[j+k-1]=1;    z_array[i]=j+k-1;  }  return;}

#include<stdio.h>#include <time.h>#include "iostream"#include <math.h>#define N 53using namespace std;//print arrayvoid display(int *a){    for (int i =0;i<N;i++)    {      cout<<" "<<a[i]<<" ";    }}int main(void){  int b[N],a[N];  for (int i =0;i<N;i++)  {    b[i] = i+1;  }  // random(a);  srand((unsigned)time(NULL));  int MaxIndex = N;  for ( i= 0;i<N;i++)  {  //     int index = (int)rand()%MaxIndex;//隨機一個 0 - 52的index    a[i] = b[index];    //隨機到的數字給a[i],i from 0 to N-1    b[index] = b[MaxIndex-1];    MaxIndex--;  }    display(a);  return 0;}