行尾有空格会PE
真是日了狗了
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<algorithm>
using namespace std;
int n,T;
struct Data{
int id,x;
friend bool operator<(Data A,Data B){return A.id<B.id;}
}a[50005];
bool cmp(Data A,Data B){return A.x<B.x || (A.x==B.x && A.id<B.id);}
int main(){
freopen("2761.in","r",stdin);
freopen("2761.out","w",stdout);
scanf("%d",&T);
while(T--){
scanf("%d",&n);
a[n+1].id=99999;
for(int i=1;i<=n;i++)scanf("%d",&a[i].x),a[i].id=i;
sort(a+1,a+n+1,cmp);
for(int i=2;i<=n;i++)if(a[i].x==a[i-1].x)a[i].id=99999;
sort(a+1,a+n+1);
for(int i=1;i<=n;i++){if(a[i+1].id==99999){printf("%d\n",a[i].x);break;}else printf("%d ",a[i].x);}
}
return 0;
}
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