[Silver 1] 9465번 스티커

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(br.readLine());
        int[][] dp = new int[100_001][3];
        
        while(t-- > 0) {
            int n = Integer.parseInt(br.readLine());
            String[] arr1 = br.readLine().split(" ");
            String[] arr2 = br.readLine().split(" ");
            int max = 0;
            
            for(int i=1; i<=n; i++) {
                dp[i][0] = Math.max(dp[i-1][0], Math.max(dp[i-1][1], dp[i-1][2]));
                dp[i][1] = Math.max(dp[i-1][0], dp[i-1][2])+Integer.parseInt(arr1[i-1]);
                dp[i][2] = Math.max(dp[i-1][0], dp[i-1][1])+Integer.parseInt(arr2[i-1]);
            }
            
            max = Math.max(dp[n][0], Math.max(dp[n][1], dp[n][2]));
            System.out.println(max);
        }
    }
}