Problem p02623 (C++) — buggy submission, verdict: Runtime Error

/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author champon
 */

//<editor-fold desc="definitions">
#include <bits/stdc++.h>
#define se cout << "test ok" << endl;
#define sp << " " <<
#define enl "\\n"
using namespace std;
using ll = long long;
using ld = long double;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using vi = vector<int>;
using vii = vector<vector<int>>;
using viii = vector<vector<vector<int>>>;
using vl = vector<ll>;
using vll = vector<vector<ll>>;
using vlll = vector<vector<vector<ll>>>;
template <class T> using V = vector<T>;
template <class T> using VV = vector<vector<T>>;
template <class T> using VVV = vector<vector<vector<T>>>;
template <class T1, class T2> using P = pair<T1, T2>;
ll mod = ll(1e9) + 7;
ll inf = ll(1e18);
void bl(bool b, ostream &out = cout) { out << (b ? "Yes" : "No") << endl; }
void bl2(bool b, ostream &out = cout) { out << (b ? "YES" : "NO") << endl; }
template <typename T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <typename T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};
int dy[] = {0, 1, 0, -1, 1, -1, -1, 1};

#ifndef INCLUDE_DEBUG_HPP
#define INCLUDE_DEBUG_HPP

#define TO_STRING(varName) #varName
#include <iostream>
#include <map>
#include <set>
#include <vector>
using namespace std;

namespace dbg {

using ll = long long;

class Debug {
  void prefix() {
    cout << "\\033[7m\\033[35m"
         << " DEBUG "
         << "\\033[0m" << endl;
  }

  void out_helper() { cout << endl; }

  void out_with_name_helper() { cout << endl; }

  template <typename T1, typename... T2> void out_helper(T1 v, T2... args);

  template <typename T1, typename... T2>
  void out_with_name_helper(string s, T1 v, T2... args);

  // value
  template <typename T> void print(T val);

  // pair
  template <typename A, typename B> void print(pair<A, B> p);

  // tuple
  template <typename A, typename B, typename C> void print(tuple<A, B, C> t);

  // vector
  template <typename T> void print(vector<T> &vec);

  // set
  template <typename T> void print(set<T> &st);

  // map
  template <typename A, typename B> void print(map<A, B> mp);

public:
  Debug() {}

  template <typename... T> void out(T... args) {
    prefix();
    out_helper(args...);
  }

  template <typename... T> void out_with_name(T... args) {
    prefix();
    out_with_name_helper(args...);
  }

  template <typename T> void outg(vector<vector<T>> &g) {
    prefix();
    for (auto &v1 : g) {
      for (auto &v2 : v1) {
        cout << v2 << " ";
      }
      cout << endl;
    }
  }
};

template <typename T1, typename... T2>
void Debug::out_helper(T1 v, T2... args) {
  print(v);
  cout << endl;
  out_helper(args...);
}

template <typename T1, typename... T2>
void Debug::out_with_name_helper(string s, T1 v, T2... args) {
  cout << s << ": ";
  print(v);
  cout << endl;
  out_with_name_helper(args...);
}

template <typename T> void Debug::print(T val) { cout << val; }

template <typename A, typename B> void Debug::print(pair<A, B> p) {
  cout << "(";
  print(p.first);
  cout << ", ";
  print(p.second);
  cout << ")";
}

template <typename A, typename B, typename C>
void Debug::print(tuple<A, B, C> t) {
  cout << "(";
  print(get<0>(t));
  cout << ", ";
  print(get<1>(t));
  cout << ", ";
  print(get<2>(t));
  cout << ")";
}

template <typename T> void Debug::print(vector<T> &vec) {
  cout << "[";
  bool fir = true;
  for (auto &e : vec) {
    if (!fir)
      cout << " ";
    print(e), fir = false;
  }
  cout << "]";
}

template <typename T> void Debug::print(set<T> &st) {
  cout << "{";
  bool fir = true;
  for (auto &e : st) {
    if (!fir)
      cout << " ";
    print(e), fir = false;
  }
  cout << "}";
}

template <typename A, typename B> void Debug::print(map<A, B> mp) {
  cout << "{";
  bool fir = true;
  for (auto &p : mp) {
    if (!fir)
      cout << " ";
    print(p), fir = false;
  }
  cout << "}";
}

} // namespace dbg

#endif // INCLUDE_DEBUG_HPP

dbg::Debug debug;
//</editor-fold>

class CTsundoku {
public:
  void solve(std::istream &in, std::ostream &out) {
    ll n, m, k;
    in >> n >> m >> k;
    vl a(n), b(m);
    for (int i = 0; i < n; i++)
      in >> a[i];
    for (int i = 0; i < m; i++)
      in >> b[i];

    vl asum(n + 1), bsum(m + 1);
    for (int i = 0; i < n; i++)
      asum[i + 1] = asum[i] + a[i];
    for (int i = 0; i < m; i++)
      bsum[i + 1] = bsum[i] + b[i];

    ll ans = 0;
    for (int i = 0; i <= n; i++) {
      auto it = upper_bound(bsum.begin(), bsum.end(), k - asum[i]);
      if (it == bsum.begin()) {
        if (asum[i] + *it <= k)
          chmax(ans, (ll)i + distance(bsum.begin(), it));
      } else {
        --it;
        chmax(ans, (ll)i + distance(bsum.begin(), it));
      }
    }

    out << ans << endl;
  }
};

int main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  CTsundoku solver;
  std::istream &in(std::cin);
  std::ostream &out(std::cout);
  solver.solve(in, out);
  return 0;
}


Error: -11

Fixed submission:

#include <iostream>
#include <vector>
using namespace std;

#define FOR(a) for (int i = 1; i <= a; i++)

int main() {
  // freopen("in.txt","r",stdin);
  long long n, m, k, temp = 0;
  cin >> n >> m >> k;

  vector<long long> vn;
  vector<long long> vm;
  long long ans = 0;

  vn.push_back(0);
  vm.push_back(0);

  FOR(n) {
    cin >> temp;

    // if(ans+temp>k) continue;
    ans += temp;
    vn.push_back(ans);
  }

  ans = 0;

  FOR(m) {
    cin >> temp;

    // if(ans+temp>k) continue;
    ans += temp;
    vm.push_back(ans);
  }

  long long mainans = 0;

  // cout<<" value of k "<<k<<endl;

  long long size = vm.size() - 1;

  for (long long i = 0; i < vn.size(); i++) {
    int m = k - vn[i];

    while (m < vm[size])
      size--;
    mainans = max(mainans, i + size);
  }
  cout << mainans << endl;

  return 0;
}