#include <iostream>

#include <cstdio>
#include <cstdlib>

#include <cmath>
#include <cstring>

#include <algorithm>

#include <string>
#include <cctype>
#include <vector>
#include <stack>
#include <bitset>
#include <set>
#include <queue>
#include <map>

using namespace std;

#define ull unsigned long long
#define ll long long
#define N 100010

ll n;
unordered_map<ll,bool> mp;
string s;

int main()
{
    cin >> n;
    for(int k = 0;k < n;k++)
    {
        ll m;
        cin >> m;
        for(int i = 1,x;i <= m;i++)
        {
            cin >> x;
            if(!mp[x]) cout<<x<<" ";
            mp[x] = true;
        }
        cout<<endl;
        mp.clear(); 
    }


    return 0;
}

用map是60pts 用unordered_map直接CE

错误信息

/tmp/compiler_zolf8wn8/src:27:1: 错误：‘unordered_map’不是一个类型名
   27 | unordered_map<ll,bool> mp;
      | ^~~~~~~~~~~~~
/tmp/compiler_zolf8wn8/src: 在函数‘int main()’中:
/tmp/compiler_zolf8wn8/src:40:17: 错误：‘mp’ was not declared in this scope; did you mean ‘m’?
   40 |             if(!mp[x]) cout<<x<<" ";
      |                 ^~
      |                 m
/tmp/compiler_zolf8wn8/src:41:13: 错误：‘mp’ was not declared in this scope; did you mean ‘m’?
   41 |             mp[x] = true;
      |             ^~
      |             m
/tmp/compiler_zolf8wn8/src:44:9: 错误：‘mp’ was not declared in this scope; did you mean ‘m’?
   44 |         mp.clear();
      |         ^~
      |         m