#include namespace { #pragma GCC diagnostic ignored "-Wunused-function" #include #pragma GCC diagnostic warning "-Wunused-function" using namespace std; using namespace atcoder; #define rep(i,n) for(int i = 0; i < (int)(n); i++) #define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--) #define all(x) begin(x), end(x) #define rall(x) rbegin(x), rend(x) template bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; } template bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; } using ll = long long; using P = pair; using VI = vector; using VVI = vector; using VL = vector; using VVL = vector; } int main() { ios::sync_with_stdio(false); cin.tie(0); int tt; cin >> tt; while(tt--) { int n; cin >> n; VI a(n); rep(i, n) cin >> a[i]; int c[2]{}; rep(i, n - 1) if (a[i] == a[i+1]) c[a[i]]++; int x0 = accumulate(all(a), 0); int x1 = n - x0; bool ok = x0 <= x1 ? x1 - x0 <= c[1] : x0 - x1 <= c[0]; cout << (ok ? "Yes\n" : "No\n"); } }