Language: C++

#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using pint = pair<int, int>;
using plint = pair<lint, lint>;
struct fast_ios { fast_ios(){ cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
template<typename T> istream &operator>>(istream &is, vector<T> &vec){ for (auto &v : vec) is >> v; return is; }
template<typename T> ostream &operator<<(ostream &os, const vector<T> &vec){ os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template<typename T> ostream &operator<<(ostream &os, const deque<T> &vec){ os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template<typename T> ostream &operator<<(ostream &os, const set<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T> ostream &operator<<(ostream &os, const multiset<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec){ os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa){ os << "(" << pa.first << "," << pa.second << ")"; return os; }
template<typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp){ os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template<typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp){ os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template<typename T> void ndarray(vector<T> &vec, int len) { vec.resize(len); }
template<typename T, typename... Args> void ndarray(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) ndarray(v, args...); }
template<typename T> void Max(T &m, const T q) { if (m < q) m = q; }
template<typename T> void Min(T &m, const T q) { if (m > q) m = q; }
template<typename T1, typename T2> pair<T1, T2> operator+(pair<T1, T2> &l, pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template<typename T1, typename T2> pair<T1, T2> operator-(pair<T1, T2> &l, pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl;

int N;
vector<int> A;

void First()
{
    puts("First");
    exit(0);
}

void Second()
{
    puts("Second");
    exit(0);
}

int main()
{
    cin >> N;
    A.resize(N);
    cin >> A;

    A.push_back(0);
    A.push_back(1E9 + 1);
    sort(A.rbegin(), A.rend());

    set<int> bad_ymx;

    int x = 1, y = A[1];
    while (x <= N)
    {
        if (A[x] == y and A[x + 1] < A[x])
        {
            // 下がる
            int bad = 1;
            if (y > 3E5)
            {
                y -= (y - max<int>(A[i + 1] + 10, 2E5)) / 2 * 2;
            }
            while (y > A[x + 1])
            {
                if (bad) bad_ymx.insert(y - x);
                bad = !bad;
                y--;
            }
        }
        else
        {
            int xt = x;
            while (A[xt + 1] == A[x]) xt++;
            bool bad = true;
            while (xt > x)
            {
                if (bad) bad_ymx.insert(y - xt);
                bad = !bad;
                xt--;
            }

            if (!bad_ymx.count(y - x - 1) and !bad_ymx.count(y - x + 1)) bad_ymx.insert(y - x);
            while (A[x + 1] == A[x]) x++;
        }
    }

    if (bad_ymx.count(0)) Second();
    else First();
}


Compiler output:
a.cc: In function 'int main()':
a.cc:65:38: error: 'i' was not declared in this scope
   65 |                 y -= (y - max<int>(A[i + 1] + 10, 2E5)) / 2 * 2;
      |                                      ^