@[WsW_](/user/349824)
```cpp
#define _CRT_SECURE_NO_WARNINGS 1
#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
struct node {
int id, s;
bool operator==(const node& p) {
return s == p.s;
}
}a[50005];
int T, n;
bool cmp1(node u, node v) {
if (u.s != v.s)return u.s < v.s;
else return u.id < v.id;
}
bool cmp2(node u, node v) {
return u.id < v.id;
}
int main() {
scanf("%d", &T);
while (T--) {
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
scanf("%d", &a[i].s);
a[i].id = i;
}
sort(a + 1, a + n + 1, cmp1);
// for(int i=1;i<=n;i++)printf("%d ",a[i].s);
// putchar('\n');
n = unique(a + 1, a + n + 1) - (a+1);//这
// for(int i=1;i<=n;i++)printf("%d ",a[i].s);
// putchar('\n');
sort(a + 1, a + 1 + n, cmp2);
for (int i = 1; i <= n; i++)
printf("%d ", a[i].s);
putchar('\n');
}
return 0;
}
```
-（a+1）不是-a
by six_小6猪 @ 2023-07-16 12:36:27
@[six_小6猪](/user/191993) thx
by WsW_ @ 2023-07-16 15:10:52