Summing A Sequence

    1#include <bits/stdc++.h>
    2using namespace std;
    3using ll = long long;
    4using i128 = __int128;
    5const int inf = 1e9;
    6const ll INF = 1e18; //❄️
    7int main() {
    8    ios::sync_with_stdio(0); cin.tie(0); 
    9    int n; cin >> n;
    10    vector<int> v(n);
    11    for (int i = 0; i < n; i++) {
    12        cin >> v[i];
    13    }
    14    vector<ll> dp(n + 1);
    15    dp[1] = max(0, v[0]);
    16    for (int i = 2; i <= n; i++) {
    17        dp[i] = max(dp[i - 1], dp[i - 2] + v[i - 1]);
    18    }
    19    cout << dp[n] << '\n';
    20    return 0;
    21}