Language: C++

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define debug(n) cout << "DEBUG1 " << n << "\n";
#define debug2(n, m) cout << "DEBUG2 " << n << ' ' << m << "\n";
#define debug3(n, m, x) cout << "DEBUG3 " << n << ' ' << m << ' ' << x << "\n";
#define debug4(n, m, x, y) cout << "DEBUG3 " << n << ' ' << m << ' ' << x << ' ' << y << "\n";
#define ss_def stringstream ss // stringstream, do ss_def(str), then ss >> n (n is int)
#define upzero(n) if (n < 0) n = 0
#pragma GCC optimize("Ofast")
using namespace std;
ll int BtoPmodM(ll int b, ll int p, ll int m) { // (b ^ p) % m (Big Mod)
    b %= m;
    if (p == 0) return 1;
    else if (p % 2 == 0) return (BtoPmodM(b, p / 2, m) * BtoPmodM(b, p / 2, m)) % m; // a^(p/2) * a^(p/2) = a^p
    else if (p % 2 == 1) return (BtoPmodM(b, (p - 1) / 2, m) * BtoPmodM(b, (p - 1) / 2, m) * b) % m; // +1
    else return 0; // a function must return something
}
ll int gcd(ll int a, ll int b) { // Euclidean Algorithm
    if (b == 0) return a;
    else return gcd(b,a % b);
}
bool coprime(ll int a, ll int b) {
    if (gcd(a, b) == 1) return true;
    else return false;
}
ll int factModP(ll int n, ll int p) {
    ll int fac[n - 1];
    fac[0] = 1;
    for (ll int i = 1;i <= n;i++) {
        fac[i] = fac[i - 1] * i % p;
    }
    return fac[n];
}
ll int power(ll int x, ll int y, ll int p) { // x ^ y % p
    ll int res = 1;
    x = x % p;
    while (y > 0) { 
        if (y & 1) res = (res * x) % p; 
        y /= 2; 
        x = (x * x) % p; 
    } 
    return res; 
}
ll int modInverse(ll int n, ll int p) {
    return power(n, p - 2, p); 
}
ll int nCrModP(ll int n, ll int r, ll int p) {
    if (r == 0) return 1;
    else if (r > n) return 0;
    ll int fac[n + 1]; 
    fac[0] = 1; 
    for (ll int i = 1;i <= n;i++) {
        fac[i] = fac[i - 1] * i % p; 
    }
    return (fac[n] * modInverse(fac[r], p) % p * modInverse(fac[n - r], p) % p) % p; 
}
ll int nCr(ll int n, ll int r) {
    ll int ans = 1;
    if (r >= n - r) {
        for (ll int i = r + 1;i <= n;i++) ans *= i;
        for (ll int i = 1;i <= n - r;i++) ans /= i;
    } else {
        for (ll int i = n - r + 1;i <= n;i++) ans *= i;
        for (ll int i = 1;i <= r;i++) ans /= i;
    }
    return ans;
}
ll int string_to_int(string str) {
	int strl = str.length();
	ll int ans = 0;
	if (str[0] == '-') {
		for (int i = 1;i < strl;i++) ans += pow(10, strl - i - 1) * (str[i] - 48);
		ans = 0 - ans;
		return ans;
	}
	for (int i = 0;i < strl;i++) ans += pow(10, strl - i - 1) * (str[i] - 48);
	return ans;
}
struct edge_stru {
	int u, v, w; // node 1, node 2, weight
};
edge_stru make_edge_stru(int u, int v, int w) {
	edge_stru a = {u, v, w};
	return a;
}
class cmp { // sorting edges
	public:
	bool operator()(edge_stru a, edge_stru b) {
		return a.w > b.w; // sort in ascending order of weight
	}
};
void make_set(int v, int* parent, int* rank) {
    parent[v] = v; // set as the root
    rank[v] = 0; // first rank is 0
    return;
}
int find_set(int v, int* parent) {
    if (v == parent[v]) return v; // finds root
//    return parent[v] = find_set(parent[v], parent); // Path compression optimization
	return find_set(parent[v], parent);
}
void union_sets(int a, int b, int* parent, int* rank) {
//    a = find_set(a, parent); // find root of a
//    b = find_set(b, parent); // find root of b
    if (rank[a] > rank[b]) swap(a, b); // let a be the bigger rank (root a < root b)
    parent[b] = a; // set node b as root a's parent
    if (rank[a] == rank[b]) rank[b]++; // if same rank set b as the child of a
    return;
}
bool binSearch(ll* arr, ll n, ll target) {
    ull l=0, r=n-1;
    while(l<r) {
        int mid=(l+r)/2;
        if(arr[mid]>=target) {
            r=mid;
        }
        else {
            l=mid+1;
        }
    }
    if(arr[l]==target) {
        return true;
    }
    else {
        return false;
    }
}
void solve() {
	int n;
	cin >> n;
	int a[n];
	for (int i = 0;i < n;i++) cin >> a[i];
	ll int tot = 1000;
	for (int i = 1;i < n;i++) {
		if (a[i - 1] <= a[i]) {
			ll int cnt = tot / a[i - 1]
			tot += (a[i] - a[i - 1]) * cnt;
		}
	}
	cout << tot << endl;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    // implementation
    solve();
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:138:25: error: expected ',' or ';' before 'tot'
  138 |                         tot += (a[i] - a[i - 1]) * cnt;
      |                         ^~~