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boj9465.cpp
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#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using p = pair<int, int>;
const int INF = 0x66554433;
inline void quick_IO(){
ios_base :: sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
}
int arr[2][100000];
int dp[2][100000];
int main(){
quick_IO();
int t;
cin>>t;
while(t--){
int n;
cin>>n;
for(int i = 0;i<n;i++){
cin>>arr[0][i];
}
for(int i = 0;i<n;i++){
cin>>arr[1][i];
}
dp[0][0] = arr[0][0];
dp[0][1] = arr[1][0] + arr[0][1];
dp[1][0] = arr[1][0];
dp[1][1] = arr[0][0] + arr[1][1];
for(int i = 2;i<n;i++){
int temp = max(dp[0][i-2], dp[1][i-2]); // i - 2 중 가장 큰 걸 가져와야한다.
dp[0][i] = max(temp, dp[1][i-1]) + arr[0][i];
dp[1][i] = max(temp, dp[0][i-1]) + arr[1][i];
}
cout<<max(dp[0][n-1], dp[1][n-1])<<"\n";
}
return 0;
}