Problem:
 Score : 200 points    Problem Statement Evi has N integers a_1,a_2,..,a_N . His objective is to have N equal integers by transforming some of them.  He may transform each integer at most once. Transforming an integer x into another integer y costs him (x-y)^2 dollars. Even if a_i=a_j (i≠j) , he has to pay the cost separately for transforming each of them (See Sample 2).  Find the minimum total cost to achieve his objective.      Constraints  1≦N≦100  -100≦a_i≦100         Input The input is given from Standard Input in the following format:  N  a_1  a_2 ... a_N       Output Print the minimum total cost to achieve Evi's objective.        Sample Input 1 2
4 8      Sample Output 1 8  Transforming the both into 6 s will cost (4-6)^2+(8-6)^2=8 dollars, which is the minimum.       Sample Input 2 3
1 1 3      Sample Output 2 3  Transforming the all into 2 s will cost (1-2)^2+(1-2)^2+(3-2)^2=3 dollars. Note that Evi has to pay (1-2)^2 dollar separately for transforming each of the two 1 s.       Sample Input 3 3
4 2 5      Sample Output 3 5  Leaving the 4 as it is and transforming the 2 and the 5 into 4 s will achieve the total cost of (2-4)^2+(5-4)^2=5 dollars, which is the minimum.       Sample Input 4 4
-100 -100 -100 -100      Sample Output 4 0  Without transforming anything, Evi's objective is already achieved. Thus, the necessary cost is 0 .

Solution (Python):
def main():
    n = int(input())
    a = list(map(int,input().split()))
    listcost = []
  
    for i in range(min(a),max(a)+1):
        cost = 0
        for j in a:
            if i != j:
                cost += (i - j) ** 2
        listcost.append(cost)
    print(min(listcost))
  
  
if __name__=='__main__':
  main()

Solution (Python):
import numpy as np
import math

N = int(input())

a = list(map(int, input().split()))

avr = np.average(a)

av1 = math.floor(avr)
av2 = math.ceil(avr)

res1 = 0
res2 = 0

for num in a:
    res1 += (num - av1) ** 2
    res2 += (num - av2) ** 2

print(min(res1, res2))

Solution (Python):


def main():

    
    N = int(input())
    a = list(map(int, input().split()))

    cost = 0
    listCost = []

    for i in range(min(a), max(a)+1):
        for j in a:
            if i != j:
                cost += (i - j) ** 2

        listCost.append(cost)
        cost = 0

    ans = min(listCost)

    print(ans)
    

if __name__ == "__main__":
    main()

Solution (Python):
import sys
def I(): return int(sys.stdin.readline().rstrip())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))

N = I()
a = LI()

x = sum(a)//N
y = x + 1

print(min(sum((i-x)**2 for i in a),sum((i-y)**2 for i in a)))

Solution (Python):
import sys
import numpy as np
from heapq import heappush, heappop 
from bisect import bisect_left as bi_l, bisect_right as bi_r
from collections import deque, Counter, defaultdict
from itertools import combinations, product
import string 
inf = float('inf')
MOD = 10**9+7



class NumberTheory():
  def __init__(self, n=2*10**6, numpy=True):
    self.n = n
    self.np_flg = numpy 
    self.is_prime_number, self.prime_numbers = self.sieve_of_eratosthenes(n)
  
  def sieve_of_eratosthenes(self, n):
    if self.np_flg:
      sieve = np.ones(n+1, dtype=np.int64); sieve[:2] = 0
      for i in range(2, int(n**.5)+1):
        if sieve[i]: sieve[i*2::i] = 0
      prime_numbers = np.flatnonzero(sieve)
    else:
      sieve = [1] * (n+1); sieve[0] = sieve[1] = 0
      for i in range(2, int(n**.5)+1):
        if not sieve[i]: continue
        for j in range(i*2, n+1, i): sieve[j] = 0
      prime_numbers = [i for i in range(2, n+1) if sieve[i]]
    return sieve, prime_numbers 

  def prime_factorize(self, n):
    res = dict()
    if n < 2: return res
    border = int(n**.5)
    for p in self.prime_numbers:
      if p > border: break
      while n % p == 0: res[p] = res.get(p, 0)+1; n //= p
      if n == 1: return res
    res[n] = 1; return res

  def prime_factorize_factorial(self, n):
    res = dict()
    for i in range(2, n+1):
      for p, c in self.prime_factorize(i).items(): res[p] = res.get(p, 0)+c
    return res
  
  @staticmethod
  def gcd(a, b): return gcd(b, a%b) if b else abs(a)

  @staticmethod
  def lcm(a, b): return abs(a // gcd(a, b) * b)

  @staticmethod
  def find_divisors(n):
    divisors = []
    for i in range(1, int(n**.5)+1):
      if n%i: continue
      divisors.append(i)
      j = n // i
      if j != i: divisors.append(j)
    return divisors
  
  @staticmethod
  def base_convert(n, b):
    if not n: return [0]
    res = []
    while n:
      n, r = divmod(n, b)
      if r < 0: n += 1; r -= b
      res.append(r)
    return res


class UnionFind():
  def __init__(self, n=10**6):
    self.root = list(range(n))
    self.height = [0] * n 
    self.size = [1] * n 
  
  def find_root(self, u):
    if self.root[u] == u: return u
    self.root[u] = self.find_root(self.root[u])
    return self.root[u]
  
  def unite(self, u, v):
    ru = self.find_root(u)
    rv = self.find_root(v)
    if ru == rv: return 
    hu = self.height[ru]
    hv = self.height[rv]
    if hu >= hv:
      self.root[rv] = ru 
      self.size[ru] += self.size[rv]
      self.height[ru] = max(hu, hv+1)
    else:
      self.root[ru] = rv 
      self.size[rv] += self.size[ru]


class Combinatorics():
  def __init__(self, N=10**9, n=10**6, mod=10**9+7, numpy=True):
    self.mod = mod
    self.nCr = dict()
    self.np_flg=numpy
    self.make_mod_tables(N, n)

  sys.setrecursionlimit(10**6)
  def choose(self, n, r, mod=None): 
    if r > n or r < 0: return 0
    if r == 0: return 1
    if (n, r) in self.nCr: return self.nCr[(n, r)]
    if not mod:
      self.nCr[(n, r)] = (self.choose(n-1, r) + self.choose(n-1, r-1))
    else:
      self.nCr[(n, r)] = (self.choose(n-1, r, mod) + self.choose(n-1, r-1, mod)) % mod
    return self.nCr[(n,r)]
  
  def cumprod(self, a):
    p = self.mod
    l = len(a); sql = int(np.sqrt(l)+1)
    a = np.resize(a, sql**2).reshape(sql, sql)
    for i in range(sql-1): a[:, i+1] *= a[:, i]; a[:, i+1] %= p
    for i in range(sql-1): a[i+1] *= a[i, -1]; a[i+1] %= p
    return np.ravel(a)[:l]

  def make_mod_tables(self, N, n):
    p = self.mod
    if self.np_flg:
      fac = np.arange(n+1); fac[0] = 1; fac = self.cumprod(fac)
      ifac = np.arange(n+1, 0, -1); ifac[0] = pow(int(fac[-1]), p-2, p)
      ifac = self.cumprod(ifac)[n::-1]
      n_choose = np.arange(N+1, N-n, -1); n_choose[0] = 1;
      n_choose[1:] = self.cumprod(n_choose[1:])*ifac[1:n+1]%p
    else:
      fac = [None]*(n+1); fac[0] = 1
      for i in range(n): fac[i+1] = fac[i]*(i+1)%p
      ifac = [None]*(n+1); ifac[n] = pow(fac[n], p-2, p)
      for i in range(n, 0, -1): ifac[i-1] = ifac[i]*i%p
      n_choose = [None] * (n+1); n_choose[0] = 1
      for i in range(n): n_choose[i+1] = n_choose[i]*(N-i)%p
      for i in range(n+1): n_choose[i] = n_choose[i]*ifac[i]%p
    self.fac, self.ifac, self.mod_n_choose = fac, ifac, n_choose
  
  def mod_choose(self, n, r):
    return self.fac[n]*self.ifac[r]%self.mod*self.ifac[n-r]%self.mod


def z_algorithm(s):
  n = len(s)
  a = [0] * n; a[0] = n
  l = r = -1
  for i in range(1, n):
    if r >= i: a[i] = min(a[i-l], r-i)
    while i + a[i] < n and s[i+a[i]] == s[a[i]]: a[i] += 1
    if i+a[i] >= r: l, r = i, i+a[i]
  return a


class ABC001():
  def A():
    h1, h2 = map(int, sys.stdin.read().split())
    print(h1-h2)

  def B(): pass
  def C(): pass 
  def D(): pass 


class ABC002():
  def A():
    x, y = map(int, sys.stdin.readline().split())
    print(max(x, y))

  def B():
    vowels = set('aeiou')
    s = sys.stdin.readline().rstrip() 
    t = ''
    for c in s:
      if c in vowels: continue 
      t += c 
    print(t)

  def C():
    *coords, = map(int, sys.stdin.readline().split())
    def triangle_area(x0, y0, x1, y1, x2, y2):
      x1 -= x0; x2 -= x0; y1 -= y0; y2 -= y0;
      return abs(x1*y2 - x2*y1) / 2
    print(triangle_area(*coords))

  def D():
    n, m = map(int, sys.stdin.readline().split())
    edges = set()
    for _ in range(m):
      x, y = map(int, sys.stdin.readline().split())
      x -= 1; y -= 1
      edges.add((x, y))
    cand = []
    for i in range(1, 1<<n):
      s = [j for j in range(n) if i>>j & 1]
      for x, y in combinations(s, 2):
        if (x, y) not in edges: break
      else:
        cand.append(len(s))
    print(max(cand))


class ABC003():
  def A():
    n = int(sys.stdin.readline().rstrip())
    print((n+1)*5000)

  def B():
    atcoder = set('atcoder')
    s, t = sys.stdin.read().split()
    for i in range(len(s)):
      if s[i] == t[i]: continue
      if s[i] == '@' and t[i] in atcoder: continue 
      if t[i] == '@' and s[i] in atcoder: continue
      print('You will lose')
      return 
    print('You can win')

  def C():
    n, k, *r = map(int, sys.stdin.read().split())
    res = 0
    for x in sorted(r)[-k:]:
      res = (res+x) / 2
    print(res)

  def D(): pass 


class ABC004():
  def A():
    print(int(sys.stdin.readline().rstrip())*2)

  def B():
    c = [sys.stdin.readline().rstrip() for _ in range(4)]
    for l in c[::-1]:
      print(l[::-1])

  def C():
    n = int(sys.stdin.readline().rstrip())
    n %= 30
    res = list(range(1, 7))
    for i in range(n):
      i %= 5
      res[i], res[i+1] = res[i+1], res[i]
    print(''.join(map(str, res)))

  def D(): pass 


class ABC005():
  def A():
    x, y = map(int, sys.stdin.readline().split())
    print(y//x)

  def B():
    n, *t = map(int, sys.stdin.read().split())
    print(min(t))

  def C():
    t = int(sys.stdin.readline().rstrip())
    n = int(sys.stdin.readline().rstrip())
    a = [int(x) for x in sys.stdin.readline().split()]
    m = int(sys.stdin.readline().rstrip())
    b = [int(x) for x in sys.stdin.readline().split()]
    i = 0
    for p in b:
      if i == n: print('no'); return 
      while p-a[i] > t:
        i += 1
        if i == n: print('no'); return 
      if a[i] > p: print('no'); return 
      i += 1
    print('yes')

  def D():
    n = int(sys.stdin.readline().rstrip())
    d = np.array([sys.stdin.readline().split() for _ in range(n)], np.int64)
    s = d.cumsum(axis=0).cumsum(axis=1)
    s = np.pad(s, 1)
    max_del = np.zeros((n+1, n+1), dtype=np.int64)
    for y in range(1, n+1):
      for x in range(1, n+1):
        max_del[y, x] = np.amax(s[y:n+1, x:n+1] - s[0:n-y+1, x:n+1] - s[y:n+1, 0:n-x+1] + s[0:n-y+1, 0:n-x+1])
    res = np.arange(n**2+1)[:, None]
    i = np.arange(1, n+1)
    res = max_del[i, np.minimum(res//i, n)].max(axis=1)
    q = int(sys.stdin.readline().rstrip())
    p = np.array(sys.stdin.read().split(), dtype=np.int64)
    print(*res[p], sep='\n')


class ABC006():
  def A():
    n = sys.stdin.readline().rstrip()
    if '3' in n: print('YES')
    elif int(n)%3 == 0: print('YES')
    else: print('NO')

  def B():
    mod = 10007
    t = [0, 0, 1]
    for _ in range(1001001):
      t.append(t[-1]+t[-2]+t[-3]); t[-1] %= mod
    n = int(sys.stdin.readline().rstrip())
    print(t[n-1])
    
  def C():
    n, m = map(int, sys.stdin.readline().split())
    cnt = [0, 0, 0]
    if m == 1: cnt = [-1, -1, -1]
    else:
      if m & 1: m -= 3; cnt[1] += 1; n -= 1
      cnt[2] = m//2 - n 
      cnt[0] = n - cnt[2]
    if cnt[0]<0 or cnt[1]<0 or cnt[2]<0: print(-1, -1, -1)
    else: print(*cnt, sep=' ')
      
  def D():
    n, *c = map(int, sys.stdin.read().split())
    lis = [inf]*n 
    for x in c: lis[bi_l(lis, x)] = x 
    print(n - bi_l(lis, inf))


class ABC007():
  def A():
    n = int(sys.stdin.readline().rstrip())
    print(n-1)

  def B():
    s = sys.stdin.readline().rstrip()
    if s == 'a': print(-1)
    else: print('a')

  def C():
    r, c = map(int, sys.stdin.readline().split())
    sy, sx = map(int, sys.stdin.readline().split())
    gy, gx = map(int, sys.stdin.readline().split())
    sy -= 1; sx -=1; gy -= 1; gx -= 1
    maze = [sys.stdin.readline().rstrip() for _ in range(r)]
    queue = deque([(sy, sx)])
    dist = np.full((r, c), np.inf); dist[sy, sx] = 0
    while queue:
      y, x = queue.popleft()
      for i, j in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
        i += y; j += x
        if maze[i][j] == '
        dist[i, j] = dist[y, x] + 1
        queue.append((i, j))
    print(int(dist[gy, gx]))
  
  def D(): pass 


class ABC008():
  def A():
    s, t = map(int, sys.stdin.readline().split())
    print(t-s+1)

  def B():
    n, *s = sys.stdin.read().split()
    res = defaultdict(int)
    for name in s: res[name] += 1
    print(sorted(res.items(), key=lambda x: x[1])[-1][0])

  def C():
    n, *a = map(int, sys.stdin.read().split())
    a = np.array(a)
    c = n - np.count_nonzero(a[:, None]%a, axis=1)
    print(np.sum((c+1)//2/c))
  
  def D(): pass

class ABC009():
  def A():
    n = int(sys.stdin.readline().rstrip())
    print((n+1)//2)

  def B():
    n, *a = map(int, sys.stdin.read().split())
    print(sorted(set(a))[-2])
    
  def C():
    n, k = map(int, sys.stdin.readline().split())
    s = list(sys.stdin.readline().rstrip())
    cost = [1]*n
    r = k
    for i in range(n-1):
      q = []
      for j in range(i+1, n):
        if s[j] < s[i] and cost[i]+cost[j] <= r:
          heappush(q, (s[j], cost[i]+cost[j], -j))
      if not q: continue
      _, c, j = heappop(q); j = -j 
      s[i], s[j] = s[j], s[i]
      r -= c 
      cost[i] = cost[j] = 0
    print(''.join(s))
      
  def D(): pass 


class ABC010():
  def A():
    print(sys.stdin.readline().rstrip()+'pp')
  def B():
    n, *a = map(int, sys.stdin.read().split())
    tot = 0
    for x in a:
      c = 0 
      while x%2==0 or x%3==2:
        x -= 1
        c += 1
      tot += c
    print(tot)

  def C():
    sx, sy, gx, gy, t, v, n, *xy = map(int, sys.stdin.read().split())
    x, y = np.array(xy).reshape(-1, 2).T
    def dist(x1, y1, x2, y2):
      return np.sqrt((x2-x1)**2 + (y2-y1)**2)
    ans = 'YES' if (dist(sx, sy, x, y)+dist(x, y, gx, gy) <= v*t).any() else 'NO'
    print(ans)

  def D(): pass 

class ABC011():
  def A():
    n = int(sys.stdin.readline().rstrip())
    print(n%12+1)

  def B():
    s = sys.stdin.readline().rstrip() 
    print(s[0].upper()+s[1:].lower())

  def C():
    n, *ng = map(int, sys.stdin.read().split())
    ng = set(ng)
    if n in ng: print('NO')
    else:
      r = 100
      while n > 0:
        if r == 0: print('NO'); return
        for i in range(3, 0, -1):
          if (n-i) in ng: continue 
          n -= i
          r -= 1
          break 
        else: print('NO'); return 
      print('YES')

  def D(): pass 


class ABC041():
  def A():
    s, i = sys.stdin.read().split()
    i = int(i)
    print(s[i-1])

  def B():
    a, b, c = map(int, sys.stdin.readline().split())
    ans = a * b % MOD * c % MOD 
    print(ans)

  def C():
    n, *a = map(int, sys.stdin.read().split())
    for i, h in sorted(enumerate(a), key=lambda x: -x[1]):
      print(i+1)

  def D():
    n, m, *xy = map(int, sys.stdin.read().split())
    *xy, = zip(*[iter(xy)]*2)
    edges = [0] * n 
    for x, y in xy:
      x -= 1; y -= 1
      edges[x] |= 1<<y
    comb = [None] * (1<<n); comb[0] = 1
    def count(edges, bit):
      if comb[bit] is not None: return comb[bit]
      comb[bit] = 0
      for i in range(n):
        if (bit>>i) & 1 and not edges[i]:
          nxt_bit = bit & ~(1<<i)
          nxt_edges = edges.copy() 
          for j in range(n):
            nxt_edges[j] &= ~(1<<i)
          cnt = count(nxt_edges, nxt_bit)
          comb[bit] += cnt
      return comb[bit]
    print(count(edges, (1<<n)-1))


class ABC042():
  def A():
    a = [int(x) for x in sys.stdin.readline().split()]
    c = Counter(a)
    print('YES' if c[5]==2 and c[7]==1 else 'NO')

  def B():
    n, l, *s = sys.stdin.read().split()
    print(''.join(sorted(s)))

  def C():
    n, k, *d = sys.stdin.read().split()
    l = len(n)
    ok = sorted(set(string.digits)-set(d))
    cand = [int(''.join(p)) for p in product(ok, repeat=l)] + [int(min(x for x in ok if x > '0')+min(ok)*l)]
    print(cand[bi_l(cand, int(n))])

  def D():
    h, w, a, b = map(int, sys.stdin.read().split())
    combinatorics = Combinatorics(n=2*10**5, mod=MOD, numpy=True)
    tot = combinatorics.mod_choose(h+w-2, h-1)
    i = np.arange(h-a, h)
    ng = np.sum(combinatorics.mod_choose(i+b-1, i) * combinatorics.mod_choose(h-i+w-b-2, h-1-i) % MOD)
    tot -= ng; tot %= MOD
    print(tot)


class ABC043():
  def A():
    n = int(sys.stdin.readline().rstrip())
    print((1+n)*n//2)

  def B():
    s = sys.stdin.readline().rstrip()
    t = ''
    for c in s:
      if c == 'B': t = t[:-1]
      else: t += c
    print(t)

  def C():
    n, *a = map(int, sys.stdin.read().split())
    a = np.array(a)
    x = np.around(a.sum()/n).astype(int)
    print(np.sum((a-x)**2))


  def D(): pass 


class ABC170():
  def A():
    x = [int(x) for x in sys.stdin.readline().split()]
    for i in range(5):
      if x[i] != i+1:
        print(i+1)
        break

  def B():
    x, y = map(int, sys.stdin.readline().split())
    print('Yes' if 2*x <= y <= 4*x and y%2 == 0 else 'No')
      
  def C():
    x, n, *p = map(int, sys.stdin.read().split())
    a = list(set(range(102)) - set(p))
    a = [(abs(y-x), y) for y in a]
    print(sorted(a)[0][1])

  def D():
    n, *a = map(int, sys.stdin.read().split())
    cand = set(a)
    cnt = 0
    for x, c in sorted(Counter(a).items()):
      cnt += c == 1 and x in cand
      cand -= set(range(x*2, 10**6+1, x))
    print(cnt)

  def E():
    n, q = map(int, sys.stdin.readline().split())
    queue = [] 
    num_kindergarten = 2*10**5
    queue_kindergarten = [[] for _ in range(num_kindergarten)]
    highest_kindergarten = [None] * num_kindergarten
    where = [None] * n
    rate = [None] * n

    def entry(i, k):
      where[i] = k
      while queue_kindergarten[k]:
        r, j = heappop(queue_kindergarten[k])
        if where[j] != k or j == i: continue 
        if rate[i] >= -r:
          highest_kindergarten[k] = rate[i]
          heappush(queue, (rate[i], k, i))
        heappush(queue_kindergarten[k], (r, j))
        break
      else:
        highest_kindergarten[k] = rate[i]
        heappush(queue, (rate[i], k, i))
      heappush(queue_kindergarten[k], (-rate[i], i))

    def transfer(i, k):
      now = where[i]
      while queue_kindergarten[now]:
        r, j = heappop(queue_kindergarten[now])
        if where[j] != now or j == i: continue
        if highest_kindergarten[now] != -r:
          highest_kindergarten[now] = -r
          heappush(queue, (-r, now, j))
        heappush(queue_kindergarten[now], (r, j))
        break
      else:
        highest_kindergarten[now] = None
      entry(i, k)

    def inquire():
      while True:
        r, k, i = heappop(queue)
        if where[i] != k or r != highest_kindergarten[k]: continue 
        heappush(queue, (r, k, i))
        return r

    for i in range(n):
      a, b = map(int, sys.stdin.readline().split())
      rate[i] = a 
      entry(i, b-1)
    for _ in range(q):
      c, d = map(int, sys.stdin.readline().split())
      transfer(c-1, d-1)
      print(inquire())
    
  def F(): pass 


class ABC171():
  def A():
    c = sys.stdin.readline().rstrip()
    print('A' if c < 'a' else 'a')

  def B():
    n, k, *p = map(int, sys.stdin.read().split())
    print(sum(sorted(p)[:k]))

  def C():
    n = int(sys.stdin.readline().rstrip())
    n -= 1
    l = 1
    while True:
      if n < pow(26, l):
        break 
      n -= pow(26, l)
      l += 1
    res = ''.join([chr(ord('a')+d) for d in NumberTheory.base_convert(n, 26)][::-1])
    res = 'a'*(l-len(res)) + res
    print(res)

  def D():
    n = int(sys.stdin.readline().rstrip())
    a = [int(x) for x in sys.stdin.readline().split()]
    s = sum(a)
    cnt = Counter(a)
    q = int(sys.stdin.readline().rstrip())
    for _ in range(q):
      b, c = map(int, sys.stdin.readline().split())
      s += (c-b)*cnt[b]
      print(s)
      cnt[c] += cnt[b]; cnt[b] = 0

  def E():
    n, *a = map(int, sys.stdin.read().split())
    s = 0
    for x in a: s ^= x 
    b = map(lambda x: x^s, a)
    print(*b, sep=' ')

  def F(): pass 


class ABC172():
  def A(): pass
  def B(): pass
  def C(): pass 
  def D(): pass 
  def E(): pass 
  def F(): pass 


class ABC173():
  def A():
    n = int(sys.stdin.readline().rstrip())
    charge = (n+999)//1000 * 1000 - n
    print(charge)

  def B():
    n, *s = sys.stdin.read().split() 
    c = Counter(s)
    for v in 'AC, WA, TLE, RE'.split(', '):
      print(f'{v} x {c[v]}')

  def C():
    h, w, k = map(int, sys.stdin.readline().split())
    c = [sys.stdin.readline().rstrip() for _ in range(h)]
    tot = 0
    for i in range(1<<h):
      for j in range(1<<w):
        cnt = 0
        for y in range(h):
          for x in range(w):
            if i>>y & 1 or j>>x & 1:
              continue 
            cnt += c[y][x] ==  '
        tot += cnt == k
    print(tot)

  def D():
    n, *a = map(int, sys.stdin.read().split())
    a.sort(reverse=True)
    res = a[0] + sum(a[1:1+(n-2)//2])*2 + a[1+(n-2)//2]*(n & 1)
    print(res)

  def E():
    MOD = 10**9+7
    n, k, *a = map(int, sys.stdin.read().split())
    minus = [x for x in a if x < 0]
    plus = [x for x in a if x > 0]
    if len(plus) + len(minus)//2*2 >= k: 
      *minus, = map(abs, minus)
      minus.sort(reverse=True)
      plus.sort(reverse=True)
      cand = []
      if len(minus)&1: minus = minus[:-1]
      for i in range(0, len(minus)-1, 2):
        cand.append(minus[i]*minus[i+1]%MOD)
      if k & 1:
        res = plus[0]
        plus = plus[1:]
      else:
        res = 1
      if len(plus)&1: plus = plus[:-1]
      for i in range(0, len(plus)-1, 2):
        cand.append(plus[i]*plus[i+1]%MOD)
      cand.sort(reverse=True)
      for x in cand[:k//2]:
        res *= x
        res %= MOD 
      print(res)
    elif 0 in a:
      print(0)
    else:
      cand = sorted(map(abs, a))
      res = 1
      for i in range(k):
        res *= cand[i]
        res %= MOD
      res = MOD - res
      print(res)
      pass
  
  def F(): pass 


if __name__ == '__main__':
  ABC043.C()

Solution (Python):
N = int(input())
A = list(map(int,input().split()))

def ans_one(i):
    ans=0
    for a in A:
        ans += (a-i)**2
    return ans

ans=10**20
for i in range(-102,103):
    ans_ = ans_one(i)
    if ans_ < ans:
        ans =ans_
print(ans)

Solution (Python):
n=int(input())
lst=list(map(int,input().split()))
ave=sum(lst)/n
if ave%1>=0.5:
    import math
    ave=math.ceil(ave)
else:
    ave//=1
ans=0
for i in lst:
    ans+=(abs(i-ave))**2
print(int(ans))

Solution (Python):
n = int(input())
a = list(map(int,input().split()))
ans=10**9
for i in range(-100,100+1):
    const=0
    for j in a:
        const += (j-i)**2
    ans=min(ans,const)
print(ans)

Solution (Python):
n=int(input())
a=list(map(int,input().split()))
cost=float("inf")
for j in range(-100,101,1):
    total=0
    for i in range(n):
        total+=(a[i]-j)**2
    if total<cost:
        cost=total
print(cost)

Solution (Python):
import math
N = int(input())
ARR = list(map(int,input().split()))

def calculate(n, arr):

    a1 = math.floor(sum(arr)/n)
    a2 = math.ceil(sum(arr)/n)

    result1 = 0
    result2 = 0
    for i in range(n):
        result1 += pow(arr[i] - a1,2)
        result2 += pow(arr[i] - a2,2)

    print(min(result1,result2))


calculate(N, ARR)

Solution (Python):
n = int(input())
a = tuple(map(int,input().split()))

ans = float('inf')
for x in range(-100,101,1):
  c = 0
  for ai in a:
    c += (x-ai)**2
  ans = min(c,ans)
print(ans)

Solution (Python):
n = int(input())
arr =list(map(int , input().split()))
ans = 10001*10001
for i in range(-100 ,101):
	tot =0
	for j in arr:
		tot = tot+(i-j)*(i-j)
	ans = min(ans, tot)
print(ans)

Solution (Python):
import math
n = int(input())
lis = list(map(int, input().split()))

avg1 = math.ceil(sum(lis)/len(lis))
avg2 = math.floor(sum(lis)/len(lis))

ans1 = 0
ans2 = 0
for i in lis:
    ans1 += (i-avg1)**2
    ans2 += (i-avg2)**2

print(min(ans1, ans2))

Solution (Python):
num = int(input())
l = list(map(int,input().split()))
min = 1000000
for n in range(-100,101):
  sum = 0
  for i in l:
    if n !=i:
      sum += (i-n)*(i-n)
  
  if min > sum:
    min = sum

print(min)

Solution (Python):
import math
N = int(input())
A = list(map(int, input().split()))

ave = sum(A)//N
cost1 = 0
cost2 = 0
cost = []
for i in A:
    cost1 += math.pow((i - ave), 2)
cost.append(cost1)

for i in A:
    cost2 += math.pow((i - ave - 1), 2)
cost.append(cost2)


print(int(min(cost)))

Solution (Python):
n = int(input())
a = list(map(int,input().split()))

ans = -100
tmp = 10**10

for i in range(-100, 101):
    t = 0
    for j in a:
        t += (j - i) ** 2
    if t < tmp:
        ans = i
        tmp = t

print(tmp)

Solution (Python):
N = int(input())
A = [int(i) for i in input().split()]

ans = 200**2 * 100
for y in range(-100, 101):
  a = 0
  for x in A:
    a += (x-y)**2
  ans = min(ans, a)

print(ans)

Solution (Python):
n = int(input())
a = list(map(int, input().split()))


y = 1000000


for i in range(-100, 101):
    x = 0
    for m in a:
        x += (i-m)**2
    if y > x:
        y = x

print(y)

Solution (Python):
import sys

read = sys.stdin.read
readline = sys.stdin.readline
readlines = sys.stdin.readlines
sys.setrecursionlimit(10 ** 9)
INF = 1 << 60
MOD = 1000000007


def main():
    N, *A = map(int, read().split())

    ans = INF
    for x in range(-100, 101):
        tmp = 0
        for a in A:
            tmp += (x - a) ** 2
        if ans > tmp:
            ans = tmp

    print(ans)
    return


if __name__ == '__main__':
    main()

Solution (Python):
N = int(input())
an = list(map(int, input().split()))

cost = 10000*N
ans = 10000*N
for i in range(-100,100+1):
    cost = sum([(j - i)**2 for j in an])
    ans = min(ans, cost)

print(ans)

Solution (Python):
N = int(input())
A = list(map(int,input().split()))
m = round(sum(A)/N)
print(sum((a-m)**2 for a in A))

Solution (Python):
N = int(input())
A = list(map(int,input().split()))
print(min(sum((a-n)**2 for a in A) for n in range(min(A),1+max(A))))

Solution (Python):
n = int(input())
a = list(map(int,input().split()))
ans = float('INF')
for i in range(-100,101):
    s = 0
    for j in range(n):
        s += (a[j]-i)**2
    ans = min(ans,s)
print(ans)

Solution (Python):



import sys


def get_ints():
    return map(int, sys.stdin.readline().strip().split())


def _main():
    input()
    an = list(get_ints())

    t = 0
    old = 1000000000
    while 1:
        ans = sq(t, an)
        g = sq(t+1, an) - ans
        t -= g / abs(g)
        if old > ans:
            old = ans
        else:
            break
    print(int(old))


def sq(t, an):
    ans = 0
    for ai in an:
        ans += pow(ai - t, 2)
    return ans


if __name__ == "__main__":
    _main()

Solution (Python):



import sys


def get_ints():
    return map(int, sys.stdin.readline().strip().split())


def _main():
    input()
    an = list(get_ints())

    t = 0
    old = 1000000000
    while 1:
        ans = sq(t, an)
        g = sq(t+1, an) - sq(t, an)
        t -= g / abs(g)
        if old > ans:
            old = ans
        else:
            break
    print(int(old))


def sq(t, an):
    ans = 0
    for ai in an:
        ans += pow(ai - t, 2)
    return ans


if __name__ == "__main__":
    _main()

Solution (Python):


import io
import sys
import math
from decimal import Decimal, ROUND_HALF_UP


def format_multi_line_answer(lst):
    ans = ""
    ans += f"{len(lst)}\n"  
    for y in lst:
        ans += f"{y}\n"
    return ans

def solve(n,n_lst):
    
    
    
    target = Decimal(sum(n_lst)/n).quantize(Decimal('0'), rounding=ROUND_HALF_UP)
    cost = 0
    for a in n_lst:
        cost += pow(a-target,2)
    return cost

def main():
    
    n = int(input())
    n_lst = list(map(int, input().split()))

    
    ans = str( solve(n,n_lst ) )
    
    
    print(ans)
    return ans
        

_DEB = 0   

_INPUT = """\
4
-100 -100 -100 -100

"""
_EXPECTED = """\
8

"""

def logd(str):
    """usage:
    if _DEB: logd(f"{str}")
    """
    if _DEB: print(f"[deb] {str}")


if __name__ == "__main__":
    if _DEB:
        sys.stdin = io.StringIO(_INPUT)
        print("!! Debug Mode !!")

    ans = main()

    if _DEB:
        print()
        if _EXPECTED.strip() == ans.strip(): print("!! Success !!")
        else: print(f"!! Failed... !!\nANSWER:   {ans}\nExpected: {_EXPECTED}")

Solution (Python):
n = int(input())
list_int = list(map(int, input().split()))
ave0 = int(sum(list_int)/n)
ave1 = ave0 + 1
ave2 = ave0 - 1

list_cost0 = [(i-ave0)**2 for i in list_int]
list_cost1 = [(i-ave1)**2 for i in list_int]
list_cost2 = [(i-ave2)**2 for i in list_int]
print(min([sum(list_cost0), sum(list_cost1), sum(list_cost2)]))

Solution (Python):
def resolve():
    N = int(input())
    a_list = list(map(int, input().split()))
    if len(set(a_list)) == 1:
        print(0)
    else:
        
        min_cost = 10 ** 6 + 1
        for x in range(-100, 101):
            cost = sum([(a -x)**2 for a in a_list])
            if cost < min_cost:
                min_cost = cost
        print(min_cost)

resolve()

Solution (Python):
N = int(input())
a = [int(x) for x in input().split()]
ans = []
for i in range(-100, 101, 1):
    v = 0
    for j in range(N):
        v += (a[j] - i) ** 2
    ans.append(v)
print(min(ans))

Solution (Python):
n = int(input())
A = list(map(int, input().split()))
min_cost = float("inf")
for num in range(-100, 101):
    cost = 0
    for a in A:
        cost += (a - num) ** 2
    min_cost = min(min_cost, cost)
print(min_cost)

Solution (Python):
import math
N = int(input())
a = list(map(int, input().split()))
a.sort()

ans = math.inf
for i in range(a[0], a[-1]+1):
  tmp = 0
  for j in range(N):
    tmp += (a[j]-i) ** 2
  if ans >= tmp:
    ans = tmp
  else:
    break
print(ans)

Solution (Python):
n = int(input())
a = list(map(int,input().split()))
ave = sum(a)//n
b = c = 0
for i in range(n):
    b += (a[i]-ave)**2
    c += (a[i] - ave - 1)**2
print(min(b,c))

Solution (Python):
def sigma(a,r):
    t=0
    for i in a:
        t+=(i-r)**2
    return t

_=int(input())
a=list(map(int,input().split()))
s=min([sigma(a,r) for r in range(-100,101)])
print(s)

Solution (Python):
n = int(input())
a = list(map(int,input().split()))
ave = sum(a)//n
b = c = 0
for i in range(n):
    b += (a[i]-ave)**2
    c += (a[i] - ave - 1)**2
print(min(b,c))

Solution (Python):
import statistics
n=int(input())
a=list(map(int,input().split()))
num=round(statistics.mean(a))
print(sum([(num-i)**2 for i in a]))

Solution (Python):
n=int(input())
integers=list(map(int,input().split()))
 
sql=[x**2 for x in integers]
s=sum(integers)
t=sum(sql)
m=min(s%n, n-s%n)
 
print((m**2-s**2)//n+t)

Solution (Python):

import sys,math,statistics
input = sys.stdin.readline
n = int(input())
a = [int(_) for _ in input().split()]
c1 = math.floor(statistics.mean(a))
c2 = math.ceil(statistics.mean(a))
a1 = sum([(i-c1)**2 for i in a])
a2 = sum([(i-c2)**2 for i in a])
print(min(a1,a2))

Solution (Python):
n=int(input())
a=list(map(int,input().split()))

mn=10**18
for i in range(-100,101):
    sm=0
    for k in range(n):
        sm+=(a[k]-i)**2
    mn=min(sm,mn)

print(mn)

Solution (Python):
import sys
import itertools

import time
import math
import heapq
from collections import defaultdict
sys.setrecursionlimit(10 ** 7)
 
INF = 10 ** 18
MOD = 10 ** 9 + 7
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines



N = int(input())
A = list(map(int, input().split()))

ans = INF
for i in range(-100, 101):
    val = 0
    for a in A:
        val += (a - i) ** 2
    ans = min(ans, val)
print(ans)

Solution (Python):
import numpy as np
n = int(input())
a = np.asarray(list(map(int, input().split())))
m = float('inf')

for i in range(-100, 101):
    m = min(np.sum((a-i)**2), m)
print(m)

Solution (Python):
N = int(input())
ls = list(map(int,input().split()))
ave = int((sum(ls)/N*2+1)//2)
cost = 0
for i in ls:
    cost += (i-ave)**2
print(cost)