Language: C++

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <numeric>
#include <string>
#include <complex>
#include <algorithm>
#include <iostream>
#include <vector>
#include <bitset>
#include <deque>
#include <queue>
#include <map>
#include <utility>
#include <functional>
#include <iomanip>
#include <unordered_map>
#include <set>
using namespace std;
using ull = unsigned long long;
using ll = long long;
using prll = pair<ll, ll>;
constexpr ll MOD = 1000000007;           //10億　= 10^9になってる
constexpr ll mINF = -922337200085470000; //llのmax-1桁の小さい方
constexpr ll pINF = 1LL << 60;
constexpr ull uINF = 1844674407399900000; //ullのmax-1桁してる
constexpr double pi = 3.1415926535897932384;
constexpr ll juu = 100000;          //10万 10e5
constexpr ll hyaku = 1000000;       //100万　10e6
constexpr ll dx[4] = {0, 0, 1, -1}; //上下左右のベクトル
constexpr ll dy[4] = {1, -1, 0, 0}; //上下左右のベクトル
#define all(v) v.begin(), v.end()
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
ll factor[300];
ll memory[300];
/*素朴法で計算
factorは必ずmemset(factor,0,sizeof(factor));
グローバルであるmemoryに個数を書き込む
memory配列の走査にはfactorの要素を使う*/
void primefac(ll num)
{
    int i = 0, kosuu = 0;
    while (*(factor + i) != 0)
    {
        while (num % *(factor + i) == 0)
        {
            num /= *(factor + i);
            memory[*(factor + i)] += 1;
        }
        if (num == 1)
            break;
        i++;
    }
}
/*グローバルにあるfactorに素数書き込む.個数を返すので配列は-1しろforは<*/
int elast(ll number)
{
    ll tmp = 0;
    int flag = 0;
    *factor = 2;
    for (int i = 3; i <= number; i++)
    {
        flag = 0;
        for (int j = 0; j <= tmp; j++)
        {
            if (i % (*(factor + j)) == 0)
            {
                flag = 1;
                break;
            }
        }
        if (flag)
            continue;
        tmp += 1;
        *(factor + tmp) = i;
    }
    return tmp + 2;
}
//繰り返し二乗。掛けられる数、回数、mod
ll powpow(ll n, ll p)
{
    if (p == 1)
        return n % MOD;
    if (p % 2 == 1)
    {
        return (n * powpow(n, p - 1)) % MOD;
    }
    ll dob = powpow(n, p / 2);
    return (dob * dob) % MOD;
}
//MODとn、rが互いに素である事が確定していないとこれは出来ない。小定理、またchild,parentでおかしくなる。 mod取った後にそれら同士で割り算するとおかしくなるから逆元使う。（合同式の性質考えろ）
ll nCrMod(ll n, ll r)
{
    ll child = 1;
    ll parent = 1;
    if (r == 0)
        return 1;
    for (ll i = 0; i < r; ++i)
    {
        child = child * (n - i) % MOD;
        parent = parent * (r - i) % MOD;
    }
    ll ans = child * powpow(parent, MOD - 2);
    return ans % MOD;
}
ll nCr(ll n, ll r)
{
    ll val = 1;
    ll i;
    if (r == 0)
        return 1;
    for (i = 0; i < r; ++i)
    {
        val *= (n - i);
        val /= (r - i);
    }
    return val;
}
ll nPr(ll n, ll r)
{
    ll val = 1;
    ll i;
    for (i = 0; i < r; ++i)
    {
        val *= (n - i);
    }
    return val;
}
template <typename T>
bool chmin(T &a, const T b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T>
bool chmax(T &a, const T b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}

/*ソートして被りを無くす*/
template <typename T>
void eraseSame(T &a)
{
    sort(all(a));
    a.erase(unique(all(a)), a.end());
}

/*aとbで大きい方を後ろにする。変更なしならtrue、ありならfalse */
template <typename T>
bool swapmax(T &a, T &b)
{
    T temp;
    temp = a;
    if (a > b)
    {
        a = b;
        b = temp;
        return false;
    }
    return true;
}
ll gcd(ll x, ll y) { return (x % y) ? gcd(y, x % y) : y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

/*一行に入力が何個あるかを1,ぶち込むvectorを2*/
template <typename T>
void splitIn(ll N, vector<T> &array)
{
    T temp;
    int i = 0;
    if (N == 0)
    {
        return;
    }
    array.resize(N);
    while (cin >> temp)
    {
        array[i] = temp;
        i++;
        if (i >= N)
        {
            break;
        }
    }
    return;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    //setprecision(15);
    ll n, k, m, l;
    ll ans = 0,ans2 = 0;
    string s;
    deque<ll> sum;
    sum.clear();
    vector<ll> v;
    cin >> n;
    splitIn(n, v);
    sort(all(v));
    ll cnt  =0;
    bool small  = true; 
    for (auto itr =v.begin(),ritr = v.end()-1; cnt < n;cnt++){
        if(small){
            if(cnt % 2 == 1){sum.push_front(*itr);}
            else {sum.push_back(*itr);}
            ++itr;
        }
        else{
            if(cnt % 2 == 1){sum.push_front(*ritr);}
            else {sum.push_back(*ritr);}
            --ritr;
        }
        if(cnt %2 == 0)small = !small;
    }
    for(ll i = 0;i < n-1;++i){
        ans += abs(sum[i] - sum[i + 1]);
    }
    sum.clear();
    ll cnt  =0;
    bool small  = false; 
    for (auto itr =v.begin(),ritr = v.end()-1; cnt < n;cnt++){
        if(small){
            if(cnt % 2 == 1){sum.push_front(*itr);}
            else {sum.push_back(*itr);}
            ++itr;
        }
        else{
            if(cnt % 2 == 1){sum.push_front(*ritr);}
            else {sum.push_back(*ritr);}
            --ritr;
        }
        if(cnt %2 == 0)small = !small;
    }
    for(ll i = 0;i < n-1;++i){
        ans2 += abs(sum[i] - sum[i + 1]);
    }
    cout << max(ans,ans2) << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:231:8: error: redeclaration of 'll cnt'
  231 |     ll cnt  =0;
      |        ^~~
a.cc:212:8: note: 'll cnt' previously declared here
  212 |     ll cnt  =0;
      |        ^~~
a.cc:232:10: error: redeclaration of 'bool small'
  232 |     bool small  = false;
      |          ^~~~~
a.cc:213:10: note: 'bool small' previously declared here
  213 |     bool small  = true;
      |          ^~~~~