stablegradients/pie-gem5-pairs huggingface dataset:
// Slower C++ solution:
#include<set>

#include<map>

#include<cmath>

#include<ctime>

#include<queue>

#include<stack>

#include<cstdio>

#include<string>

#include<vector>

#include<random>

#include<cstdlib>

#include<cstring>

#include<iomanip>

#include<iostream>

#include<algorithm>

#include<unordered_map>

#define endl "\n"

#define fi first

#define se second

#define db double

#define gcd __gcd

#define pb push_back

#define mp make_pair

#define lowbit(x) (x & (-x))

#define PII  pair<int, int> 

#define all(x) x.begin(), x.end()

#define debug(x) cout << #x << " = " << x << endl

#define rep(i, a, b) for(__typeof(b) i = a; i <= (b); i++)

#define Rep(i, a, b) for(__typeof(a) i = a; i >= (b); i--)

#define FAST ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)

template<class T> inline T qmin(T a, T b) { return a < b ? a : b; }

template<class T> inline T qmax(T a, T b) { return a > b ? a : b; }

typedef long long ll;

typedef unsigned long long ull;

const db eps = 1e-9;

const db PI = acos(-1);

const int inf = 0x3f3f3f3f;

const int mod = (int)1e9 + 7;

const int maxn = (int)1e5 + 5;//remember to modify it, No RE or MLE

const ll INF = 0x3f3f3f3f3f3f3f3f;

using namespace std;

ll qpow(ll x, ll y) { ll ret = 1; for( ; y; y >>= 1, x = (x * x) % mod) if(y & 1) ret = (ret * x) % mod; return ret; }



inline int read(){

	char ch = getchar();

	int x = 0, f = 1;

	while(ch < '0' || ch > '9'){

		if(ch == '-') f = -1;

		ch = getchar();

	}

	while('0' <= ch && ch <= '9'){

		x = x * 10 + ch - '0';

		ch = getchar();

	}

	return x * f;

}



int n;

int h[maxn], dp[maxn];



int main()

{

	n = read();

	rep(i, 1, n) h[i] = read();

	memset(dp, 0x3f, sizeof dp);

	dp[1] = 0;

	rep(i, 1, n){

		dp[i+1] = qmin(dp[i+1], dp[i] + abs(h[i] - h[i+1]));

		dp[i+2] = qmin(dp[i+2], dp[i] + abs(h[i] - h[i+2]));

	}

	printf("%d\n", dp[n]);

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.3662664796534911x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include<bits/stdc++.h>

using namespace std;

#define ll long long int

#define dbl double

#define pi acos(-1)

#define sc1(a) scanf("%lld",&a)

#define sc2(a,b) scanf("%lld%lld",&a,&b)

#define sc3(a,b,c) scanf("%lld%lld%lld",&a,&b,&c)

#define pb push_back



ll ara[1000005];



map<ll,ll>vis;

map<ll,ll>vis1;

map<ll,ll>pos;

map<ll,ll>high;

map<ll,ll>low;

map<string,ll>mp;

vector<ll>vec;

vector<ll>v;

stack<ll>q;

string str1[100];

string str2[100];

priority_queue<ll>pq;

ll dp[1000005],t;

ll mn=1000000;

ll call(ll id)

{

    if(id==t )return 0;

    if(dp[id]!=-1)

        return dp[id];

    ll p=call(id+1)+abs(ara[id+1]-ara[id]);

    ll q=100000000;

    if(id+2!=t+1)

        q=call(id+2)+abs(ara[id+2]-ara[id]);

    dp[id]=min(p,q);

    return dp[id];



}

int main()

{



    // ll t;

    memset(dp,-1,sizeof(dp));

    sc1(t);

    for(ll i=1; i<=t; i++)

    {

        sc1(ara[i]);

    }

    cout<<call(1)<<endl;

    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 9.280819023607432x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>



#define forn(i, n) for (int i = 0; i < int(n); ++i)

#define for1(i, n) for (int i = 1; i <= int(n); ++i)

#define fore(i, l, r) for (int i = int(l); i <= int(r); ++i)

#define ford(i, n) for (int i = int(n)-1; i >= 0; --i)

#define pb push_back

#define eb emplace_back

#define ms(a, x) memset(a, x, sizeof(a))

#define F first

#define S second

#define endl '\n'

#define de(x) cout<<#x<<" = "<<(x)<<endl

#define de2(x,y) cout<<#x<<" = "<<(x) <<' '<< #y<<" = "<<y<<endl;



using namespace std;



typedef long long ll;

typedef pair<int, int> pii;

const int INF = 0x3f3f3f3f;

mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());



const int N=1e5+5;

int dp[N];

int main() {

    ios::sync_with_stdio(false);

    cin.tie(nullptr);

	int n;

	cin>>n;

	vector<int> a(n);

	for(auto& it:a) cin>>it;

	ms(dp,INF);

	dp[0]=0;

	for(int i=1;i<n;i++){

		dp[i]=min(dp[i],dp[i-1]+abs(a[i]-a[i-1]));

		if(i>1) dp[i]=min(dp[i],dp[i-2]+abs(a[i]-a[i-2]));

	}

	cout<<dp[n-1];

    return 0;

}




// Faster C++ solution for the same problem (measured speedup: 1.410538229153344x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;



int a[1000001];

int dp[1000001];

int it;



int fr(int p){

	if (p==it-1){

      return 0;

    }

	if(dp[p]!=-1){

      return dp[p];

    }

	int re=abs(a[p]-a[p+1])+fr(p+1);

	if(p!=it-2){

      re=min(re,abs(a[p]-a[p+2])+fr(p+2));

    }

	return dp[p]=re;

}

int main(){

	cin>>it;

	for(int i=0;i<it;i++){

    cin>>a[i];

    }



	memset(dp,-1,sizeof dp);

	cout<<fr(0)<<endl;

	return 0;

}


// Faster C++ solution for the same problem (measured speedup: 5.014872467712207x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:


#include <iostream>

#include <bits/stdc++.h>





using namespace std;





int a[100005], p[100005],n, i;

int respuesta(int x)

{

    if(x==n) return 0;

    if(x>n) return 1e9;

    if(p[x]!=-1)return p[x];

    return p[x]=min(abs(a[x+1]-a[x])+respuesta(x+1), abs(a[x+2]-a[x])+respuesta(x+2));

}





int main()

{

    memset(p,-1,sizeof p);

    cin>>n;

    for(i=1;i<=n;i++)

    {

        cin>>a[i];

    }

    cout<<respuesta(1)<<endl;

    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.3847245677969868x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef long long int lli;

typedef long double ld;

const int oo = 1e9;

const int mod = 1e9+9;

//===========================================================//

const int nax = 1e5+3;

int n;

int dp[nax];

int a[nax];

int f(int i){

	if (i==n-1) return 0;

	if(dp[i]!=-1) return dp[i];

	int ans = abs(a[i]-a[i+1])+f(i+1);

	if(i!=n-2) ans = min(ans, abs(a[i]-a[i+2])+f(i+2));

	return dp[i]=ans;

}

int main(){

	cin>>n;

	for(int i=0; i<n; i++) cin>>a[i];

	memset(dp, -1, sizeof dp);

	cout<<f(0)<<endl;

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.3816724425267275x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef long long int lli;

typedef long double ld;

const int oo = 1e9;

const int mod = 1e9+9;

/*ll gcd(ll x, ll y){return (y ? gcd(y, x%y) : x); }

*ll lcm(ll x, ll y){return x*(y/gcd(x,y));}

*void exEuclid(int a, int b){

	if(b==0){x = 1; y=0; d=a; return ;}

	exEuclid(b, a%b);

	int x1=y;

	int y1=x-(a/b)*y;

	x=x1;

	y=y1;

} 

* */

//===========================================================//

const int nax = 1e5+3;

int n;

int dp[nax];

int a[nax];

int f(int i){

	if (i==n-1) return 0;

	if(dp[i]!=-1) return dp[i];

	int ans = abs(a[i]-a[i+1])+f(i+1);

	if(i!=n-2) ans = min(ans, abs(a[i]-a[i+2])+f(i+2));

	return dp[i]=ans;

}

int main(){

	cin>>n;

	for(int i=0; i<n; i++) cin>>a[i];

	memset(dp, -1, sizeof dp);

	cout<<f(0)<<endl;

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.3816724425267275x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

ll dp[100009];

int arr[100009];

ll sum = 0;

long long Frog1(int n){

 

    if(n==0) return 0;

    else if(n==1) return abs(arr[n] - arr[n-1]);

    if(dp[n]!=-1) return dp[n];

    else {

            ll x = Frog1(n-1);

            ll y = Frog1(n-2);

        dp[n] = min(abs (arr[n-1] - arr[n]) + x,abs(arr[n-2] - arr[n]) + y);

        //cout << n << " = " << dp[n] << endl;

         return dp[n];

    }

}

 

 

int main()

{

    int n;

    memset(dp,-1,sizeof(dp));

    cin >> n;

    for(int i=0;i<n;i++) cin >> arr[i];

    cout << Frog1(n-1) << endl;

}

// Faster C++ solution for the same problem (measured speedup: 1.7782329373147452x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

#define ll long long

#define ld long double

#define sf scanf

#define pf printf

#define pb push_back

#define llu unsigned long long

#define U unsigned int

#define SIZE 1000002

#define pie 3.14159265358979323

#define minuss 1e-6

#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)

 

#define BIG 100000000

 

ll  lcm(ll a,ll b)

{

    ll GCD=__gcd(a,b);

    ll lcm=(a*b)/GCD;

    return lcm;

}

ll dp[100005];

ll weight[1000005],value[1000005];

ll total,val;

ll call(ll n)

{

    if(n>=total)

        return 0;

 

    if(dp[n]!=-1)

        return dp[n];

 

    ll res1=BIG,res2=BIG;

 

   // if(weight[n]+c<=val)

    res1=abs(weight[n]-weight[n+1]) + call(n+1);

    if(n+2<=total) res2=abs(weight[n]-weight[n+2]) + call(n+2);

    //cout<<n<<" "<<res1<<" "<<res2<<endl;

    dp[n]=min(res1,res2);

    return dp[n];

 

}

int main()

{

    cin>>total;

    for ( int i = 1; i <=total; ++i )

        cin>>weight[i];

 

    memset(dp, -1, sizeof(dp));

    ll ret=call(1);

    cout<<ret<<endl;

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.7775662234138194x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;



int num[100001], memo[100001];



int dp(int n){

    if(n==0) return 0;

    if(n==1) return abs(num[0]-num[1]);

    if(memo[n]!=-1) return memo[n];

    return memo[n]=min(dp(n-1)+abs(num[n-1]-num[n]), dp(n-2)+abs(num[n-2]-num[n]));

}



int main(){

    //freopen("in.txt", "r", stdin);

    //freopen("out.txt", "w", stdout);

    ios_base::sync_with_stdio(0);

    cin.tie(0);

    memset(memo, -1, sizeof(memo));

    int n;

    cin>>n;

    for(int i=0; i<n; ++i) cin>>num[i];

    cout<<dp(n-1)<<"\n";

    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.3912457527332966x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>



using namespace std;

int v[100010];

int memo[100010];

int c;



int f(int i)

{



    if(memo[i]!=-1)

        return memo[i];



    if(i == 0)

        return memo[0] = 0;



    if(i == 1)

        return memo[1] = abs(v[0] - v[1]);



    return memo[i] = min(abs(v[i] - v[i-1]) + f(i-1), abs(v[i] - v[i-2]) + f(i-2));

}



int main()

{



    memset(memo, -1, sizeof(memo));

    cin>>c;



    for(int i = 0; i<c; i++)

    {

        cin>>v[i];

    }



    cout<<f(c-1)<<endl;



    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.3769679495372724x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>



using namespace std;



const int N = 1e5 + 9;



int n, h[N], dp[N];



int solve(int i){

    if(i == n - 1)  return 0;

    if(i == n)   return 1e9;



    int &ret = dp[i];

    if(~ret)    return ret;



    return ret = min(abs(h[i] - h[i + 1]) + solve(i + 1), abs(h[i] - h[i + 2]) + solve(i + 2));

}



int main(){



    cin >> n;

    for(int i = 0;i < n;i++)

        cin >> h[i];



    memset(dp, -1, sizeof dp);



    cout << solve(0);

}


// Faster C++ solution for the same problem (measured speedup: 1.3799692076874615x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

int n;

long long h[100005];

long long dp[100005];



long long solve(int i){

	if(i >= n-1) return 0;

	if(dp[i] != -1) return dp[i];



	dp[i] = 1e17;

	if(i+1 <= n-1)

		dp[i] = min(dp[i], abs(h[i] - h[i+1]) + solve(i+1));

	if(i+2 <= n-1)

		dp[i] = min(dp[i], abs(h[i] - h[i+2]) + solve(i+2));



	return dp[i];

}



int main(){

	scanf("%d", &n);

	for (int i = 0; i < n; ++i)

		scanf("%lld", &h[i]);

	memset(dp, -1, sizeof dp);

	cout<<solve(0)<<endl;

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.778150800380034x):
#include<cstdio>

#include<cmath>

#include<cstring>

#include<iostream>

#include<vector>

#include<stack>

#define maxn 100005

using namespace std;



int main(void)

{

    int n;

    cin >> n;

    int h[maxn];

    for(int i=1; i<=n; i++){

        cin >> h[i];

    }

    int dp[maxn];

    dp[0]=0;

    dp[1]=0;



    for(int i=2; i<=n; i++){

        int a,b;

        a = dp[i-1] + abs(h[i]-h[i-1]);

        if(i-2 > 0)

            b = dp[i-2] + abs(h[i]-h[i-2]);

        else b=0x7fffffff;

        dp[i] = min(a, b);

    }

    cout << dp[n];

    return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

#define N (int)2e5

int n,memo[N],c[N];



int dp(int curr) {

    if (curr == n) return 0;

    if (curr > n) return 1e9;

    int &sol = memo[curr];

    if (sol != -1) return sol;

    sol = min(

        dp(curr + 1) + abs(c[curr] - c[curr + 1]) ,

        dp(curr + 2) + abs(c[curr] - c[curr + 2])

    );

    return sol;

}



int main() {

    scanf("%d" , &n);

    for (int i = 1 ; i <= n ; i++)

        scanf("%d" , &c[i]);

    memset (memo , -1 , sizeof memo);

    printf("%d\n" , dp(1));

}


// Faster C++ solution for the same problem (measured speedup: 1.765380022802963x):
#include "bits/stdc++.h"



using namespace std;



typedef pair<int, int> pii;

typedef long long ll;



#define MAX_N 100000



ll dp[MAX_N], h[MAX_N], N;



int main() {

    ios_base::sync_with_stdio(false);

    cin.tie(nullptr);



    cin >> N;



    for (int i = 0; i < N; i++)

        cin >> h[i];



    dp[1] = abs(h[1] - h[0]), dp[0] = 0;



    for (int i = 2; i < N; i++) {

        dp[i] = min(dp[i - 2] + abs(h[i] - h[i - 2]), dp[i - 1] + abs(h[i] - h[i - 1]));

    }



    cout << dp[N - 1] << "\n";



    // --------------------

    return 0;

}
// Slower C++ solution:
#include<set>

#include<map>

#include<cmath>

#include<ctime>

#include<queue>

#include<stack>

#include<cstdio>

#include<string>

#include<vector>

#include<random>

#include<cstdlib>

#include<cstring>

#include<iomanip>

#include<iostream>

#include<algorithm>

#include<unordered_map>

#define endl "\n"

#define fi first

#define se second

#define db double

#define gcd __gcd

#define pb push_back

#define mp make_pair

#define lowbit(x) (x & (-x))

#define PII  pair<int, int> 

#define all(x) x.begin(), x.end()

#define debug(x) cout << #x << " = " << x << endl

#define rep(i, a, b) for(__typeof(b) i = a; i <= (b); i++)

#define Rep(i, a, b) for(__typeof(a) i = a; i >= (b); i--)

#define FAST ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)

template<class T> inline T qmin(T a, T b) { return a < b ? a : b; }

template<class T> inline T qmax(T a, T b) { return a > b ? a : b; }

typedef long long ll;

typedef unsigned long long ull;

const db eps = 1e-9;

const db PI = acos(-1);

const int inf = 0x3f3f3f3f;

const int mod = (int)1e9 + 7;

const int maxn = (int)1e5 + 5;//remember to modify it, No RE or MLE

const ll INF = 0x3f3f3f3f3f3f3f3f;

using namespace std;

ll qpow(ll x, ll y) { ll ret = 1; for( ; y; y >>= 1, x = (x * x) % mod) if(y & 1) ret = (ret * x) % mod; return ret; }



inline int read(){

	char ch = getchar();

	int x = 0, f = 1;

	while(ch < '0' || ch > '9'){

		if(ch == '-') f = -1;

		ch = getchar();

	}

	while('0' <= ch && ch <= '9'){

		x = x * 10 + ch - '0';

		ch = getchar();

	}

	return x * f;

}



int n;

int h[maxn], dp[maxn];



int main()

{

	n = read();

	rep(i, 1, n) h[i] = read();

	memset(dp, 0x3f, sizeof dp);

	dp[1] = 0;

	rep(i, 1, n){

		dp[i+1] = qmin(dp[i+1], dp[i] + abs(h[i] - h[i+1]));

		dp[i+2] = qmin(dp[i+2], dp[i] + abs(h[i] - h[i+2]));

	}

	printf("%d\n", dp[n]);

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.3663338553734423x):
#include "bits/stdc++.h"



using namespace std;



typedef pair<int, int> pii;

typedef long long ll;



#define MAX_N 100000



ll dp[MAX_N], h[MAX_N], N;



int main() {

    ios_base::sync_with_stdio(false);

    cin.tie(nullptr);



    cin >> N;



    for (int i = 0; i < N; i++)

        cin >> h[i];



    dp[1] = abs(h[1] - h[0]), dp[0] = 0;



    for (int i = 2; i < N; i++) {

        dp[i] = min(dp[i - 2] + abs(h[i] - h[i - 2]), dp[i - 1] + abs(h[i] - h[i - 1]));

    }



    cout << dp[N - 1] << "\n";



    // --------------------

    return 0;

}