Problem p02603 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
/*---------------------DEBUGGING--------------------------------------------*/
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\\'' << x << '\\''; }
void __print(const char *x) { cerr << '\\"' << x << '\\"'; }
void __print(const string &x) { cerr << '\\"' << x << '\\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }

template <typename T, typename V> void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T> void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x)
    cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\\n"; }
template <typename T, typename... V> void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v))
    cerr << ", ";
  _print(v...);
}
#ifndef ONLINE_JUDGE
#define debug(x...)                                                            \\
  cerr << "[" << #x << "] = [";                                                \\
  _print(x)
#else
#define debug(x...)
#endif
/*-------------------------------------------------------------------------------------*/
// #define mp make_pair
#define pb push_back
#define ll long long
#define pii pair<int, int>
#define pcc pair<char, char>
#define F first
#define S second
#define int long long
#define pi 3.141592653589793238462643383279502
#define M 1000000007
#define rep(i, a, n) for (int i = a; i < n; i++)
#define INF 10000000000000
#define N 200005
#define vi vector<int>
#define all(v) v.begin(), v.end()
#define endl "\\n"
// #define ordered_set tree<int, null_type,less<int>,
// rb_tree_tag,tree_order_statistics_node_update>

signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  vi a(n);
  rep(i, 0, n) cin >> a[i];
  int money = 1000;
  for (int i = 1; i < n; i++) {
    if (a[i] > a[i - 1]) {
      int stocks = (money / a[i - 1]);
      money = (money % a[i - 1] + stocks * a[i]);
    }
  }
  cout << money << endl;
}


Error: 0

Fixed submission:

#include <bits/stdc++.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
/*---------------------DEBUGGING--------------------------------------------*/
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\\'' << x << '\\''; }
void __print(const char *x) { cerr << '\\"' << x << '\\"'; }
void __print(const string &x) { cerr << '\\"' << x << '\\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }

template <typename T, typename V> void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T> void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x)
    cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\\n"; }
template <typename T, typename... V> void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v))
    cerr << ", ";
  _print(v...);
}
#ifndef ONLINE_JUDGE
#define debug(x...)                                                            \\
  cerr << "[" << #x << "] = [";                                                \\
  _print(x)
#else
#define debug(x...)
#endif
/*-------------------------------------------------------------------------------------*/
// #define mp make_pair
#define pb push_back
#define ll long long
#define pii pair<int, int>
#define pcc pair<char, char>
#define F first
#define S second
#define int long long
#define pi 3.141592653589793238462643383279502
#define M 1000000007
#define rep(i, a, n) for (int i = a; i < n; i++)
#define INF 10000000000000
#define N 200005
#define vi vector<int>
#define all(v) v.begin(), v.end()
#define endl "\\n"
// #define ordered_set tree<int, null_type,less<int>,
// rb_tree_tag,tree_order_statistics_node_update>
bool dp[80][25001];
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  vi a(n);
  rep(i, 0, n) cin >> a[i];
  dp[0][1000] = true;
  for (int i = 1; i < n; i++) {
    for (int j = 0; j < i; j++) {
      for (int k = 0; k <= 25000; k++) {
        dp[i][k] |= dp[j][k];
        if (dp[j][k]) {
          int stocks = (k / a[j]);
          int tot = (k % (a[j]) + stocks * (a[i]));
          dp[i][tot] |= dp[j][k];
        }
      }
    }
  }
  for (int k = 25000; k >= 0; k--) {
    if (dp[n - 1][k]) {
      cout << k << endl;
      return 0;
    }
  }
}