Go: package main

import (
	"bufio"
	_ "container/heap"
	"fmt"
	"os"
	_ "sort"
	"strconv"
)

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func lcm(a, b int) int {
	return a / gcd(a, b) * b
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
const MOD = int(1e+9) + 7
const INF = 1 << 60

func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	defer wtr.Flush()
	for true {
		N, M := sc.nextInt(), sc.nextInt()
		if N == 0 && M == 0 {
			break
		}
		C := sc.nextIntSlice(M)
		X := sc.nextIntSlice(N)
		dp := make([][256]int, N+1)
		for i := 0; i < N+1; i++ {
			for j := 0; j < 256; j++ {
				dp[i][j] = INF
			}
		}
		dp[0][128] = 0
		for i := 0; i < N; i++ {
			for j := 0; j < 256; j++ {
				if dp[i][j] == INF {
					continue
				}
				for k := 0; k < M; k++ {
					nex := j + C[k]
					if nex < 0 {
						nex = 0
					}
					if nex > 255 {
						nex = 255
					}
					dp[i+1][nex] = min(dp[i+1][nex], dp[i][j]+pow(X[i]-nex, 2))
				}
			}
		}
		ans := INF
		for i := 0; i < 256; i++ {
			ans = min(ans, dp[N][i])
		}
		fmt.Fprintln(wtr, ans)
	}
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <functional>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <utility>
#include <sstream>
#include <complex>

using namespace std;

#define FOR(i,a,b) for(long long i=(a);i<(b);i++)
#define REP(i,N) for(long long i=0;i<(N);i++)
#define ALL(s) (s).begin(),(s).end()
#define fi first
#define se second

#define PI acos(-1.0)
#define INF 1000000007
#define EPS 1e-10

typedef long long ll;
typedef pair<ll, ll> P;
typedef pair<double, double> PD;
typedef pair<string, ll> PS;
typedef vector<ll> V;
typedef pair<P, char> PC;

ll n, m;
ll c[100], x[20010];
ll dp[20][30000];

int main(){
	while (cin >> n >> m&&n + m){
		REP(i, 20)REP(j, 300)dp[i][j] = INF;
		REP(i, m)cin >> c[i];
		REP(i, n)cin >> x[i];
		dp[0][128] = 0;
		REP(i, n){
			REP(j, m){
				REP(k, 256){
					int num = k + c[j];
					if (num < 0)num = 0;
					if (num > 255)num = 255;
					dp[i + 1][num] = min(dp[i][k] + (x[i] - (num))*(x[i] - (num)), dp[i + 1][num]);
				}
			}
		}
		ll ans = INF;
		//REP(i, n + 1){
		//	cout << i << endl;
		//	FOR(j, 120, 140){
		//		cout << dp[i][j] << " ";
		//	}
		//	cout << endl;
		//}
		REP(i, 300){
			ans = min(ans, dp[n][i]);
		}
		cout << ans << endl;
	}
}

C++: //=================================
// Created on: 2018/07/03 05:20:29
//=================================
#include <bits/stdc++.h>
using namespace std;
int main()
{
    for (int N, M;;) {
        cin >> N >> M;
        if (N == 0 and M == 0) { break; }
        vector<int> C(M), x(N);
        for (int i = 0; i < M; i++) { cin >> C[i]; }
        for (int i = 0; i < N; i++) { cin >> x[i]; }
        constexpr int INF = 1 << 30;
        vector<int> dp(256, INF);
        dp[128] = 0;
        for (int i = 0; i < N; i++) {
            vector<int> tmp(256, INF);
            for (int j = 0; j < 256; j++) {
                if (dp[j] == INF) { continue; }
                for (int k = 0; k < M; k++) {
                    const int next = max(0, min(255, j + C[k]));
                    tmp[next] = min(tmp[next], dp[j] + (next - x[i]) * (next - x[i]));
                }
            }
            dp = tmp;
        }
        cout << *min_element(dp.begin(), dp.end()) << endl;
    }
    return 0;
}

C++: #include <iostream>
#include <algorithm>

using namespace std;

inline int adj(int x) {
  return min(max(x, 0), 255);
}
#define SQ(x) ((x)*(x))
int main() {
  int N, M, INF=1<<28;
  while(cin >> N >> M && (N|M)) {
    int C[M];
    for(int i=0; i<M; i++) cin >> C[i];
    int dp[2][256]; fill(dp[0], dp[0]+512, INF);
    dp[0][128] = 0;
    for(int k=0; k<N; k++) {
      for(int i=0; i<256; i++) dp[(k+1)%2][i] = INF;
      int in; cin >> in;
      for(int i=0; i<256; i++) {
        if(dp[k%2][i]>=INF) continue;
        for(int j=0; j<M; j++) {
          dp[(k+1)%2][adj(i+C[j])] = min(dp[(k+1)%2][adj(i+C[j])], dp[k%2][i]+SQ(in-adj(i+C[j])));
        }
      }
    }
    cout << *min_element(dp[N%2], dp[(N%2)+1]) << endl;
  }
  
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())

void solve(ll n, ll m) {
    const ll inf = LONG_LONG_MAX / 2 - 1;
    vector<ll> c(m), x(n);
    rep(i, m) cin >> c[i];
    rep(i, n) cin >> x[i];
    vector<vector<ll>> dp(n + 1, vector<ll>(256, inf));
    dp[0][128] = 0;
    rep(i, n) {
        rep(j, 256) {
            if (dp[i][j] == inf) continue;
            rep(k, m) {
                ll idx = j + c[k];
                idx = max(idx, 0LL);
                idx = min(idx, 255LL);
                ll val = dp[i][j] + (x[i] - idx) * (x[i] - idx);
                dp[i + 1][idx] = min(dp[i + 1][idx], val);
            }
        }
    }
    ll ans = LONG_LONG_MAX;
    rep(i, 256) ans = min(ans, dp[n][i]);
    cout << ans << endl;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    while(true) {
        ll n, m;
        cin >> n >> m;
        if ((n == 0) && (m == 0)) break;
        solve(n, m);
    }
    return 0;
}