Problem p03048 (C++)

Buggy submission (status: Time Limit Exceeded):
#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define endl '\n'
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, a, b) for (int i = int(a); i < int(b); i++)
#define pb emplace_back
#define all(x) (x).begin(), (x).end()
int mod = 1e9 + 7;
int mod2 = 998244353;
const int INF = 1e9;

signed main() {
  ll a, b, c, n;
  cin >> a >> b >> c >> n;
  int ans = 0;

  for (int i = 0; i * a <= n; i++) {
    for (int j = 0; i * a + j * b <= n; j++) {
      for (int k = 0; i * a + b * j + k * c <= n; k++) {
        if (i * a + b * j + k * c == n)
          ans++;
      }
    }
  }
  cout << ans << endl;
}

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// .``..
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// `.`.
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// ..
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Fixed submission:
#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define endl '\n'
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, a, b) for (int i = int(a); i < int(b); i++)
#define pb emplace_back
#define all(x) (x).begin(), (x).end()
int mod = 1e9 + 7;
int mod2 = 998244353;
const int INF = 1e9;

signed main() {
  ll a, b, c, n;
  cin >> a >> b >> c >> n;
  int ans = 0;

  for (int i = 0; i * a <= n; i++) {
    for (int j = 0; i * a + j * b <= n; j++) {
      if ((n - (i * a + j * b)) % c == 0)
        ans++;
    }
  }
  cout << ans << endl;
}

// `.`..`(WNNNNNNMNWWWH9rttwgHM8OtttwwVtttrrtrttrw0rtrtwrrrtrZUAOOrrrXWppHMHyZHpWHMHMkWWVHMNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
// `.`.`..`(WMNMHfWH9ZtrtAdNM8ttttOwVtrrtrrtrrrrrdrrttrZkOrrrrrrXWyrtrrZWWWWMmwXWppWHHMmWHkWMMNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
// .`.```_..(HMfWH9OtttwXWHBrttrOw0rttrOvrrrtrZrrRrtrrrtZHwrrrrrwwZHyrrrrZWWpWMmwWppkWHHMkHNkVWMNNNNN#NN#NN#NN#NN#NN#NN#NN#NN#NN#NNNN
// .``..
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// `.`.
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// `.`.
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// ..
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// .
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