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#include <cstdio>
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#include <set>
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int main()
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{
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int t, n;
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scanf("%d", &t);
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while (t--)
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{
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scanf("%d", &n);
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std::set<int> S;
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for (int i = 0, x; i < n; i++)
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{
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scanf("%d", &x);
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if (S.count(x) == 0)
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S.insert(x), printf(i == 0 ? "%d" : " %d", x);
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}
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putchar('\n');
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}
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} |
