func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MX = 500005;   const long long MOD = 1000000007;   void setIO(string name) {     ios_base::sync_with_stdio(0);     cin.tie(0);     freopen((name +  .in ).c_str(),  r , stdin);     freopen((name +  .out ).c_str(),  w , stdout);   }   int t;   int n;   void solve() {     cin >> n;     long long x = 0, even = 0, odd = 0;     long long sum = 0, improv = 0;     for (int i = 0; i < (n); i++) {       int a;       cin >> a;       if (i % 2 == 0) {         x -= a;         improv = max(improv, x - even);         even = min(x, even);         sum += a;       }       if (i % 2 == 1) {         x += a;         improv = max(improv, x - odd);         odd = min(x, odd);       }     }     cout << sum + improv << endl;   }   int main() {     cin >> t;     for (int i = 0; i < (t); i++) {       solve();     }   }   