Problem p02635 (C++)

Buggy submission (status: Runtime Error):

#include <bits/stdc++.h>

using namespace std;

#ifdef Adrian
#include "debug.h"
#else
#define debug(...) 9999
#endif

typedef long long ll;
typedef long double ld;
typedef complex<ld> point;
#define F first
#define S second
#define ii pair<ll, ll>
template <typename G> struct triple {
  G F, S, T;
};
#define iii triple<int>

int main() {

#ifdef Adrian
  // freopen("test.txt", "r", stdin);
#else
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
#endif

  const ll mod = 998244353;
  string s;
  int h;
  cin >> s >> h;

  int n = 0;
  for (auto &i : s)
    n += (i == '1');

  vector<int> v;
  for (int i = 0, j = 0; i < s.size(); i = j) {
    for (; j < s.size() && s[j] == '1'; j++)
      ;
    v.push_back(j - i);
    ++j;
  }

  int m = v.size();
  vector<vector<ll>> cur(n + 1, vector<ll>(n + 1));
  vector<vector<ll>> next(n + 1, vector<ll>(n + 1));
  for (int i = 0; i <= n; i++)
    cur[i][0] = 1;

  vector<vector<ll>> ac1(2 * n + 1, vector<ll>(n + 2));
  vector<vector<ll>> ac2(n + 1, vector<ll>(n + 2));

  for (int i = 1; i < m; i++) {
    for (int j = 0; j <= n; j++)
      for (int k = 0; k <= n; k++) {
        ac1[j + k][j + 1] = cur[j][k];
        ac2[k][j + 1] = cur[j][k];
      }

    for (auto &j : ac1)
      for (int k = 1; k < j.size(); k++)
        j[k] = (j[k] + j[k - 1]) % mod;
    for (auto &j : ac2)
      for (int k = 1; k < j.size(); k++)
        j[k] = (j[k] + j[k - 1]) % mod;

    for (int j = 0; j <= n; j++)
      for (int k = 0; k <= n; k++) {
        next[j][k] = ac1[j + k][min(n, j + min(v[i], k)) + 1] - ac1[j + k][j];
        next[j][k] += ac2[k][j];

        next[j][k] %= mod;
        if (next[j][k] < 0)
          next[j][k] += mod;
      }

    swap(next, cur);
  }

  ll ans = 0;
  for (int i = 0; i <= h; i++)
    ans = (ans + cur[0][i]) % mod;

  cout << ans << '\n';

  return 0;
}


Fixed submission:

#include <bits/stdc++.h>

using namespace std;

#ifdef Adrian
#include "debug.h"
#else
#define debug(...) 9999
#endif

typedef long long ll;
typedef long double ld;
typedef complex<ld> point;
#define F first
#define S second
#define ii pair<ll, ll>
template <typename G> struct triple {
  G F, S, T;
};
#define iii triple<int>

int main() {

#ifdef Adrian
  // freopen("test.txt", "r", stdin);
#else
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
#endif

  const ll mod = 998244353;
  string s;
  int h;
  cin >> s >> h;

  int n = 0;
  for (auto &i : s)
    n += (i == '1');

  vector<int> v;
  for (int i = 0, j = 0; i < s.size(); i = j) {
    for (; j < s.size() && s[j] == '1'; j++)
      ;
    v.push_back(j - i);
    ++j;
  }

  int m = v.size();
  vector<vector<ll>> cur(n + 1, vector<ll>(n + 1));
  vector<vector<ll>> next(n + 1, vector<ll>(n + 1));
  for (int i = 0; i <= n; i++)
    cur[i][0] = 1;

  vector<vector<ll>> ac1(2 * n + 1, vector<ll>(n + 2));
  vector<vector<ll>> ac2(n + 1, vector<ll>(n + 2));

  for (int i = 1; i < m; i++) {
    for (int j = 0; j <= n; j++)
      for (int k = 0; k <= n; k++) {
        ac1[j + k][j + 1] = cur[j][k];
        ac2[k][j + 1] = cur[j][k];
      }

    for (auto &j : ac1)
      for (int k = 1; k < j.size(); k++)
        j[k] = (j[k] + j[k - 1]) % mod;
    for (auto &j : ac2)
      for (int k = 1; k < j.size(); k++)
        j[k] = (j[k] + j[k - 1]) % mod;

    for (int j = 0; j <= n; j++)
      for (int k = 0; k <= n; k++) {
        next[j][k] = ac1[j + k][min(n, j + min(v[i], k)) + 1] - ac1[j + k][j];
        next[j][k] += ac2[k][j];

        next[j][k] %= mod;
        if (next[j][k] < 0)
          next[j][k] += mod;
      }

    swap(next, cur);
  }

  ll ans = 0;
  for (int i = 0; i <= min(h, n); i++)
    ans = (ans + cur[0][i]) % mod;

  cout << ans << '\n';

  return 0;
}