Simple Program Undeclared Identifier Issues in C++ [on hold]

I have a simple program that for some reason is giving multiple undeclared identifier errors when I compile, for example with the variable "n". My code is below:

#include <iostream>
using namespace std;

int main() {
    int q; cin >> q;
    int a[10002];
    int dp[10002];
    dp[1] = a[1];
    dp[2] = max(a[1], a[2]);
    for (int t = 1; t <= q; t++)
        int n; 
        cin >> n;
        for (int i = 1; i <= n; i++) cin >> a[i];
        for (int i = 3; i <= n; i++) {
            dp[i] = max(dp[i-1], dp[i-2]) + a[i];
        }
        cout << "Case " << t << ": " << dp[n] << "\n";
    }
    return 0;
}