stablegradients/pie-gem5-pairs huggingface dataset:
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;



#define fi first

#define se second

#define pb push_back

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

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



typedef long long ll;

typedef long double ld;

typedef pair<int, int> pii;

typedef pair<ll, ll> pll;

typedef vector<int> vi;

typedef vector<vi> vvi;

typedef vector<pii> vii;



const int MAX = 1e5;

const int INF = 1e9;

vi stone(MAX + 5);

vi dp(MAX + 5, -1);

int n;



int sol(int i){

    if(i >= n) return INF;

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

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

    dp[i] = sol(i + 1) + abs(stone[i] - stone[i + 1]);

    if(i + 2 < n){

        dp[i] = min(dp[i], sol(i + 2) + abs(stone[i] - stone[i + 2]));

    }

    return dp[i];

}



int main(){

    ios_base::sync_with_stdio(0);

    cin.tie(0);

    #ifdef LOCAL

        freopen("input.txt", "r", stdin);

    #else

        #define endl '\n'

    #endif

    cin >> n;

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

        cin >> stone[i];

    cout << sol(0) << endl;

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.320953209190203x):
#include <bits/stdc++.h>



using namespace std;



typedef long long ll;

const double eps=1e-6,pi=acos(-1);

const int N=1e5+5,M=1e9+7,SEGM=4*N,OO=0x3f3f3f3f;

int n,m,a[N],b[N],c[N];

int mem[N];



int solve(int i=0){

    if(i>=n) return 1e9;

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

    int &ret=mem[i];

    if(~ret) return ret;

    ret=1e9;

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

    ret=min(ret,solve(i+2)+abs(a[i]-a[i+2]));

    return ret;

}



int main(){

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

    scanf("%d",&n);

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

        scanf("%d",a+i);

    memset(mem,-1,sizeof mem);

    printf("%d",solve());

    return 0;

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

using namespace std;

//-------------------------------------------MACROS---------------------------------------------

#define 	TIEMPO_CORRIDA		cerr << "tiempo: "<<1.0*clock()/CLOCKS_PER_SEC <<" seg.\n";

#define 	FILES				freopen("input.txt","r",stdin),freopen("output.txt","w",stdout);

#define 	FORIT(it,e)			for(it = e.begin() ; it != e.end() ; it++)

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

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

#define 	FORSW(i,a,b,sw)		for(i = a ; i < b && sw ; i++)

#define 	RFORSW(i,a,b,sw)	for(i = a ; i >= b && sw ; i--)

#define 	fast 				ios::sync_with_stdio(false),cin.tie(),cout.tie();

#define 	to_int(x) 			atoi(x.data())

#define 	to_long(x) 			atoll(x.data())

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

#define 	RALL(x) 			x.rbegin(),x.rend()

typedef 	long long 			ll;

typedef 	pair<int,int> 		pi;

typedef 	pair<ll,ll> 		pl;

const		int 				modN = 1e9+7;

const		double 				PI = 3.1415926535897932384626433832795028841;

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

const int tam = 6e5;

const int oo=1e9;

int ar[tam],memo[tam];

int n;



int f(int x){

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

	if(x == n-1) return memo[x]=0;

	int a=oo , b=oo;

	if(x+1 <n) a = f(x+1) + abs(ar[x+1]-ar[x]); 

	if(x+2 <n) b = f(x+2) + abs(ar[x+2]-ar[x]);

	return memo[x]=min(a,b);

}



int main(){

	int i;

	while(scanf("%d",&n)==1){

		memset(memo,-1,sizeof memo);

		FOR(i,0,n) scanf("%d",&ar[i]);

		printf("%d\n",f(0));

	}

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.442647962448643x):
#include <bits/stdc++.h>



using namespace std;



typedef long long ll;

const double eps=1e-6,pi=acos(-1);

const int N=1e5+5,M=1e9+7,SEGM=4*N,OO=0x3f3f3f3f;

int n,m,a[N],b[N],c[N];

int mem[N];



int solve(int i=0){

    if(i>=n) return 1e9;

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

    int &ret=mem[i];

    if(~ret) return ret;

    ret=1e9;

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

    ret=min(ret,solve(i+2)+abs(a[i]-a[i+2]));

    return ret;

}



int main(){

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

    scanf("%d",&n);

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

        scanf("%d",a+i);

    memset(mem,-1,sizeof mem);

    printf("%d",solve());

    return 0;

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

#define ll long long

#define endl "\n"

using namespace std;

inline int D()

{

    int t;

    scanf("%d",&t);

    return t;

}

inline ll llD()

{

    ll t;

    scanf("%lld",&t);

    return t;

}



const int Max=1e6+9;

const int OO=-1e6;

int st[4]= {1,0,0,-1};

int nt[4]= {0,1,-1,0};

int n,m;

bool valid(int x,int y)

{

    return x>-1 && y>-1 && x<n && y<m;

}

ll mem[Max];

void init()

{

    memset(mem,-1,sizeof mem);

}

//////////////////////////////////////////////////////////



ll a[Max];



ll solve (int i )

{

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

    if(i>=n)

        return Max;



    ll &ret=mem[i];

    if(~ret)return ret;



    ll take1 =solve(i+1)+abs(a[i]-a[i+1]);

    ll take2 =solve(i+2)+abs(a[i]-a[i+2]);



     return mem[i]=min(take2,take1);

}



void Fast()

{

    std::ios_base::sync_with_stdio(0);

    cin.tie(0);

    cout.tie(0);

    cerr.tie(0);

}

int main()

{

   init();

   n =D();

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

   {

       a[i]=llD();

   }

   printf("%lld",solve(0));



}


// Faster C++ solution for the same problem (measured speedup: 6.757172851621277x):
#include <bits/stdc++.h>



using namespace std;



typedef long long ll;

const double eps=1e-6,pi=acos(-1);

const int N=1e5+5,M=1e9+7,SEGM=4*N,OO=0x3f3f3f3f;

int n,m,a[N],b[N],c[N];

int mem[N];



int solve(int i=0){

    if(i>=n) return 1e9;

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

    int &ret=mem[i];

    if(~ret) return ret;

    ret=1e9;

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

    ret=min(ret,solve(i+2)+abs(a[i]-a[i+2]));

    return ret;

}



int main(){

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

    scanf("%d",&n);

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

        scanf("%d",a+i);

    memset(mem,-1,sizeof mem);

    printf("%d",solve());

    return 0;

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

using namespace std;



#define INF 1e18;

#define MAX_N 100005

long long N, h[MAX_N], memo[MAX_N];



long long dp(int pos) {

  if (pos < 1) {

  	return INF;

  }

  if (pos == 1) {

  	return 0;

  }

  if (pos == 2) {

  	return abs(h[2] - h[1]);

  }

  if (memo[pos] != -1) {

  	return memo[pos];

  }

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

}



int main() {

  cin >> N;

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

  	cin >> h[i];

  }

  /*

  memo[2] = abs(h[2] - h[1]);

  for (int i = 3; i <= N; i++) {

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

  }

  */

  /*

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

  	cout << i << ' ' << memo[i] << '\n';

  }

  */

  // cout << memo[N] << '\n';

  memset(memo, -1, sizeof memo);

  cout << dp(N) << '\n';

}

// Faster C++ solution for the same problem (measured speedup: 1.2700425309893455x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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

using namespace std;

int n , a[1000000] , frog , memo[1000000];



int f(int n){

	if(n == 1)return 0;

	if(n == 2)return abs(a[1] - a[2]);

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

	memo[n] = min(f(n-1) + abs(a[n] - a[n-1]) , f(n-2) + abs(a[n] - a[n-2]));

	return memo[n];

}

int main(){

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

	scanf("%d" , &n);

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

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

	}

	printf("%d" , f(n));

}

// Faster C++ solution for the same problem (measured speedup: 3.5787442102308473x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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

using namespace std;

#define ll long long

ll dp[100009];

ll n,x;

vector<ll>v;

ll frog(ll pos)

{

    if(pos<=0)

        return 0;

    if(pos==1)

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

        if(dp[pos]==-1)

        {

            dp[pos]= min(abs(v[pos]-v[pos-1])+frog(pos-1),abs(v[pos]-v[pos-2])+frog(pos-2));

        }

    return dp[pos];

}



int main()

{

    cin>>n;

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

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

    {

        cin>>x;

        v.push_back(x);

    }

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

}


// Faster C++ solution for the same problem (measured speedup: 1.2738424305619391x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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



using namespace std;

int v[1000010];

int memo[1000010];

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: 3.5904206108954404x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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



using namespace std;



#define F first

#define S second



int N;

int H[100005];

int dp[100005][5];



int solve(int cost, int ind, int j) {

	if (ind > N) return INT32_MAX;

	if (ind == N) return cost;



	if (~dp[ind][j]) return dp[ind][j];

	

	dp[ind][j] = cost;

	dp[ind][j] += min(solve(abs(H[ind] - H[ind + 1]), ind + 1, 0), 

					solve(abs(H[ind] - H[ind + 2]), ind + 2, 1));

	return dp[ind][j];

}



int main() {

	cin >> N; 

	H[0] = INT32_MAX; // to avoid RTE

	for (int i = 1; i <= N; i++) cin >> H[i];

	int ans = 0;

	

	memset(dp, -1, sizeof dp);

	cout << solve(0, 1, 0) << endl;



	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.1208011805732414x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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

#define inf INFINITY

#define file freopen( "input.txt" , "r" , stdin) ; freopen( "output.txt" , "w" , stdout) ;

#define Gamed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

#define _3102_ main()

#define endl '\n'

typedef long long ll;

typedef unsigned long long ull;

typedef long double ld;

using namespace std;

const int N = 1e5 + 100;

const ll MX = 1e9;

const ll mod = 1e9 + 7;

const double eps = 1e-9 ;



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

ll solve( int i ){

	if ( i < 0 ) return 0 ;

	ll &ret = dp[i] ;

	if ( ~ret ) return ret ;

	if ( i == 0 ) return ret = 0 ;

	if ( i == 1 ) return ret = abs( h[1] - h[0]) ; 

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

}



int _3102_{

	Gamed

	cin >> n ;

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

		cin >> h[i] ;

	}

	memset ( dp , -1 , sizeof dp ) ;

	cout << solve ( n - 1 ) ;



	return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.2806676568076454x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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



#define fst first

#define snd second

#define fore(i,a,b) for(int i=a, ThxDem=b; i<ThxDem; ++i)

#define pb push_back

#define ALL(s) s.begin(),s.end()

#define FIN ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define SZ(s) int(s.size())

#define DBG(x) cerr <<#x << " = " << (x) << "\n"



#define SQR(x) ((x) * (x))



#define PI 3.1415926535897932385

#define INF 1000111222

#define eps 1e-7

#define maxN 11



using namespace std;



typedef long long ll;

typedef vector<ll> vll;

typedef pair<ll,ll> pll;

typedef pair<int,int> pii;

typedef vector<string> vstr;

typedef vector<vll> vvll;

typedef vector<bool> vbool;

typedef vector<pll> vpll;

typedef vector<vpll> vvpll;

typedef vector<vbool> vvbool;



vll ns,dp;

ll n;



ll solve(ll pos){

	ll & d = dp[pos];

	if(d != -1) return d;

	ll v=INF;

	if((pos+1)<n)v = min(v,abs(ns[pos+1]-ns[pos])+solve(pos+1));

	if((pos+2)<n)v = min(v,abs(ns[pos+2]-ns[pos])+solve(pos+2));

	if(pos == (n-1)) v = 0;

	return d = v;

}



int main(){FIN

	

	cin >> n;

	ns.resize(n);

	dp.assign(100010,-1);

	fore(i,0,n)cin >> ns[i];

	

	solve(0);

	

	cout << dp[0] << "\n";



	return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.2884978810805792x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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

using namespace std;



#define fi first

#define se second

#define pb push_back

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

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



typedef long long ll;

typedef long double ld;

typedef pair<int, int> pii;

typedef pair<ll, ll> pll;

typedef vector<int> vi;

typedef vector<vi> vvi;

typedef vector<pii> vii;



const int MAX = 1e5;

const int INF = 1e9;

vi stone(MAX + 5);

vi dp(MAX + 5, -1);

int n;



int sol(int i){

    if(i >= n) return INF;

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

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

    dp[i] = sol(i + 1) + abs(stone[i] - stone[i + 1]);

    if(i + 2 < n){

        dp[i] = min(dp[i], sol(i + 2) + abs(stone[i] - stone[i + 2]));

    }

    return dp[i];

}



int main(){

    ios_base::sync_with_stdio(0);

    cin.tie(0);

    #ifdef LOCAL

        freopen("input.txt", "r", stdin);

    #else

        #define endl '\n'

    #endif

    cin >> n;

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

        cin >> stone[i];

    cout << sol(0) << endl;

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.293362719839931x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

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

using namespace std;

//-------------------------------------------MACROS---------------------------------------------

#define 	TIEMPO_CORRIDA		cerr << "tiempo: "<<1.0*clock()/CLOCKS_PER_SEC <<" seg.\n";

#define 	FILES				freopen("input.txt","r",stdin),freopen("output.txt","w",stdout);

#define 	FORIT(it,e)			for(it = e.begin() ; it != e.end() ; it++)

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

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

#define 	FORSW(i,a,b,sw)		for(i = a ; i < b && sw ; i++)

#define 	RFORSW(i,a,b,sw)	for(i = a ; i >= b && sw ; i--)

#define 	fast 				ios::sync_with_stdio(false),cin.tie(),cout.tie();

#define 	to_int(x) 			atoi(x.data())

#define 	to_long(x) 			atoll(x.data())

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

#define 	RALL(x) 			x.rbegin(),x.rend()

typedef 	long long 			ll;

typedef 	pair<int,int> 		pi;

typedef 	pair<ll,ll> 		pl;

const		int 				modN = 1e9+7;

const		double 				PI = 3.1415926535897932384626433832795028841;

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

const int tam = 6e5;

const int oo=1e9;

int ar[tam],memo[tam];

int n;



int f(int x){

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

	if(x == n-1) return memo[x]=0;

	int a=oo , b=oo;

	if(x+1 <n) a = f(x+1) + abs(ar[x+1]-ar[x]); 

	if(x+2 <n) b = f(x+2) + abs(ar[x+2]-ar[x]);

	return memo[x]=min(a,b);

}



int main(){

	int i;

	while(scanf("%d",&n)==1){

		memset(memo,-1,sizeof memo);

		FOR(i,0,n) scanf("%d",&ar[i]);

		printf("%d\n",f(0));

	}

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.391628855847798x):
#include <bits/stdc++.h>

 

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#pragma GCC optimize("Ofast")

//1.0 * clock() / CLOCKS_PER_SEC

 

#define fi first

#define se second

#define ll long long int

#define dl double long

 

using namespace std;

 

const int N = 1e5 + 7;

const ll mod = 1e9 + 7;



vector<int> dp(N);



void solve1()

{

	int n;

	cin >> n;

	int ar[n];

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

		cin >> ar[i];

	dp[1] = 0;

	dp[2] = abs(ar[1] - ar[0]);

	for(int i = 3; i <= n; i++){

		dp[i] = min(abs(ar[i - 1] - ar[i - 2]) + dp[i - 1], abs(ar[i - 1] - ar[i - 3]) + dp[i - 2]);

	}

	cout << dp[n];

}

int main()

{

    ios_base::sync_with_stdio(0);

    cin.tie(0); cout.tie(0); srand(time(0));

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

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

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

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

    

    int cghf = 1;//cin >> cghf;

    while( cghf-- ){

        solve1();

    }

}