A - House Robber

#include <bits/stdc++.h>
using namespace std;

#define int long long
const int N = 1e6 + 5;
const int mod = 1e9 + 7;
const int INF = 1e18;
int a[N];
int dp[N];

signed main()
{
    int n;
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    int m = 0;
    dp[0] = a[0];
    for(int i = 1; i < n; i++){
        dp[i] = m + a[i];
        m = max(m , dp[i - 1]);
    }
    int ans = 0;
    for(int i = 0; i < n; i++){
        ans = max(ans , dp[i]);
    }
    cout << ans << endl;
}