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 <bits/stdc++.h>

int main() {
    for(;;) {
        int n, m;
        std::cin >> n >> m;
        if (n == 0 && m == 0) {
            break;
        }
        std::vector<int> cs(m);
        for(int i = 0; i < m; ++i) {
            std::cin >> cs[i];
        }
        std::vector<int> xs(n);
        for(int i = 0; i < n; ++i) {
            std::cin >> xs[i];
        }
        long inf = 1LL << 50;
        std::vector<long> dp(256, inf);
        dp[128] = 0;
        for(int i = 0; i < n; ++i) {
            std::vector<long> dp2(256, inf);
            for(int v = 0; v < 256; ++v) {
                for(int c : cs) {
                    int new_v = std::max(0, std::min(v + c, 255));
                    long diff = new_v - xs[i];
                    dp2[new_v] = std::min(dp2[new_v], dp[v] + diff * diff);
                }
            }
            dp = dp2;
        }
        long res = inf;
        for(int v = 0; v < 256; ++v) {
            res = std::min(res, dp[v]);
        }
        printf("%ld\n", res);
    }
}

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

#define INF 1e9
#define llINF 1e18
#define MOD 1e9+7
#define pb push_back
#define mp make_pair 
#define F first
#define S second
#define ll long long
#define sqr(x) (x)*(x)
using namespace std;
vector<int>C(5000);
vector<int>x(100000);
int ans=0;
int n,m;
int main(){
  while(cin>>n>>m,n){
    ans=INF;
    int dp[n+20][530]={};
    for(int i=0;i<n+2;i++)
      for(int j=0;j<520;j++)
	dp[i][j]=INF;
    for(int i=0;i<m;i++)
      cin>>C[i];
    for(int i=0;i<n;i++){
      cin>>x[i];
      x[i]+=260;
    }

    dp[0][128+260]=0;
    for(int i=1;i<=n;i++){
      for(int j=5;j<=515;j++){
	if(dp[i-1][j]!=INF){
	  for(int k=0;k<m;k++){
	    int num=j+C[k];
	    if(num>=515)num=515;
	    else if(num<=5)num=5;
	    //cout<<i<<" "<<
	    dp[i][num]=min(dp[i-1][j]+((num-x[i-1])*(num-x[i-1])),dp[i][num]);
	  }
	}
      }
    }
    for(int i=0;i<520;i++){
      ans=min(dp[n][i],ans);
    }
    cout<<ans<<endl;
  }
  return 0;
}