#include<bits/stdc++.h>
#define Ll long long
using namespace std;
int main()
{
scanf(
"%d",&n);
srand(time(
0));
for(
int i=
1;i<=n;i++)a[i]=i;
while(++sum<=
1000)
random_shuffle(a+
1,a+n+
1);
}
这样可以让a数组重新随机排列一遍
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