Atcoder Educational Dp contest :: A frog 1

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

#define ll long long
const int inf = 1e9 + 5;
const int mod = 1e9 + 7;

int main(){
    ll n;
    cin>>n;
    vector<ll> a(n);
    for(ll i=0;i<n;i++)cin>>a[i];
    vector<ll> dp(n,inf);
    dp[0] = 0;
    for(ll i=0;i<n;i++){
        for(ll j=i+1;j<=i+2;j++){
            if(j<n){
                dp[j] = min(dp[j],dp[i]+abs(a[i] - a[j]));
            }
        }
        //cout<<dp[i]<<" ";
    }
    cout<<dp[n-1];
}

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