感觉思路没错，为什么不对？

#include<bits/stdc++.h>
using namespace std;

#define ll long long
//#define int ll

const int N=1e5+5;
const int M=1e3+5;
const ll MOD=1e4+7;

int T;
int a[N];

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
    cin>>T;
    while(T--)
    {
        int n,x,ans;
        cin>>n;
        for(int i=1;i<=n;i++)
        {
            cin>>a[i];
            if(a[1]!=a[i])
                ans=1;
        }
        if(ans==1)
            cout<<n-1<<endl;
        else cout<<n<<endl;
    }
    return 0;
}