Language: C++

#include <iostream>
#include <string>
#include <algorithm>
#include <cassert>
#include <set>
#include <vector>
#include <cmath>
#include <bitset>
#include <functional>
#include <limits>
#include <map>
using namespace std;

typedef long long ll;
#define rep1(i, n) for(ll i = 1; i <=(ll)(n); i++)
#define rep0(i, n) for(ll i = 0; i <=(ll)(n); i++)

ll pow(ll a, ll n) { //compute a^n with o(logn)
    ll res = 1;
    while (n > 0) {
        if (n & 1) res = res * a;
        a = a * a;
        n >>= 1;
    }
    return res;
}

ll pow(ll a, ll n, ll mod) { //compute a^n (mod mod) with o(logn)
    ll res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % mod;
        a = a * a % mod;
        n >>= 1;
    }
    return res;
}

const int MAX = 199;
const int MOD = 1000000007;
ll fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

// 二項係数計算
ll COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

//順列計算
ll PER(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[n - k] % MOD) % MOD;
}

int main(){
    ll n;
    cin >> n;
    ll a[n+1];
    rep1(i,n) cin >> a[i];
    double money = 1000;
    double num = 0;
    if(n == 2){
        ll k = floor((int)money/a[1]);
        money = max((int)money, (int)money + k*(a[2] - a[1]));
        cout << money << endl;
        return 0;
    }

    if(a[1] < a[2]){
        //buy
        num = floor(money/a[1]);
        money -= num*a[1];
    }
    for(int i = 2; i <= n-1;i++){
        if(a[i-1] <= a[i] && a[i] > a[i+1]){
            //sell
            money += a[i]*num;
            num = 0;
        }else if(a[i-1] >= a[i] && a[i] < a[i+1]){
            //buy
            num = floor(money/a[i]);
            money -= num*a[i];
        }
    }
    money += num*a[n];
    cout << money << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:77:20: error: no matching function for call to 'max(int, ll)'
   77 |         money = max((int)money, (int)money + k*(a[2] - a[1]));
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:77:20: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   77 |         money = max((int)money, (int)money + k*(a[2] - a[1]));
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:77:20: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   77 |         money = max((int)money, (int)money + k*(a[2] - a[1]));
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~