54 lines
935 B
C++
54 lines
935 B
C++
#include <bits/stdc++.h>
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using namespace std;
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#define all(x) (x).begin(), (x).end()
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#define sz(x) static_cast<int>((x).size())
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#define FOR(x) for (size_t i = 0; i < (x).size(); ++i)
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#define FORI(x) for (size_t i = 0; i < (x); ++i)
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#ifdef LOCAL
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#define dbg(x) cerr << #x << " = " << (x) << '\n'
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#else
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#define dbg(x)
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#endif
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void solve() {
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int n;
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cin >> n;
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vector<int> a(n);
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int total = 0;
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FOR(a) {
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int x;
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cin >> x;
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a[i] = x;
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total += x;
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}
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long long odds = 0, evens = 0;
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for (int i = 0; i < n; i++) {
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(i & 1 ? odds : evens) += a[i];
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}
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int odd_count = n >> 1, even_count = (n >> 1) + (n & 1);
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if (odds % odd_count == 0 && evens % even_count == 0 &&
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odds / odd_count == evens / even_count) {
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cout << "YES\n";
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} else {
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cout << "NO\n";
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}
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}
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int main() {
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ios::sync_with_stdio(false);
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cin.tie(nullptr);
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int t;
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cin >> t;
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while (t--) {
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solve();
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}
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return 0;
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}
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