54 lines
929 B
C++
54 lines
929 B
C++
#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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#define prln(...) std::println(__VA_ARGS__)
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#define pr(...) std::print(__VA_ARGS__)
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#ifdef LOCAL
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#define dbgln(...) std::println(__VA_ARGS__)
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#define dbg(...) std::print(__VA_ARGS__)
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#else
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#define dbgln(...)
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#define dbg(...)
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#endif
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// }}}
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bitset<10000 + 1> seen;
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void solve() {
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seen.reset();
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int n;
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cin >> n;
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int a, dups = 0;
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for (int i = 0; i < n; ++i) {
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cin >> a;
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if (seen[a]) {
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++dups;
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} else {
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seen[a] = true;
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}
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}
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int unique = n - dups;
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cout << (dups & 1 ? unique - 1 : unique) << '\n';
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}
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int main() { // {{{
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cin.tie(nullptr)->sync_with_stdio(false);
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cin.exceptions(cin.failbit);
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int tc = 1;
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cin >> tc;
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for (int t = 0; t < tc; ++t) {
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solve();
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}
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return 0;
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}
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// }}}
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