func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int arr[200005];   pair<long long int, long long int> even[200005];   pair<long long int, long long int> odd[200005];   int main() {     long long int n;     cin >> n;     for (long long int i = 1; i <= n; i++) cin >> arr[i];     even[2] = make_pair(0, 2);     odd[2] = make_pair(abs(arr[2] - arr[1]), 1);     for (long long int i = 3; i <= n; i++) {       long long int preve = even[i - 1].first;       long long int prevel = even[i - 1].second;       long long int prevo = odd[i - 1].first;       long long int prevol = odd[i - 1].second;       if (i % 2 == 0) {         odd[i] = make_pair(prevo + abs(arr[i] - arr[i - 1]), prevol);         if (preve - abs(arr[i] - arr[i - 1]) <= 0)           even[i] = make_pair(0, i);         else           even[i] = make_pair(preve - abs(arr[i] - arr[i - 1]), prevel);       } else {         even[i] = make_pair(preve + abs(arr[i] - arr[i - 1]), prevel);         if (prevo - abs(arr[i] - arr[i - 1]) <= 0)           odd[i] = make_pair(0, i);         else           odd[i] = make_pair(prevo - abs(arr[i] - arr[i - 1]), prevol);       }     }     long long int m = 0;     for (long long int i = 1; i <= n; i++) {       m = max(m, max(even[i].first, odd[i].first));     }     cout << m << endl;   }   