Problem p02686 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>
using namespace std;

#define REP(i, m, n) for (int i = (m); i < (int)(n); i++)
#define RREP(i, m, n) for (int i = (int)(n - 1); i >= m; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define fi first
#define se second
#define debug(...)                                                             \\
  {                                                                            \\
    cerr << "[L" << __LINE__ << "] ";                                          \\
    _debug(__VA_ARGS__);                                                       \\
  }

template <typename T1, typename T2>
ostream &operator<<(ostream &o, const pair<T1, T2> &p) {
  return o << "(" << p.first << ", " << p.second << ")";
}
template <typename T> string join(const vector<T> &v, string del = ", ") {
  stringstream s;
  for (auto x : v)
    s << del << x;
  return s.str().substr(del.size());
}
template <typename T> ostream &operator<<(ostream &o, const vector<T> &v) {
  if (v.size())
    o << "[" << join(v) << "]";
  return o;
}
template <typename T>
ostream &operator<<(ostream &o, const vector<vector<T>> &vv) {
  int l = vv.size();
  if (l) {
    o << endl;
    rep(i, l) o << (i == 0 ? "[ " : ",\\n  ") << vv[i]
                << (i == l - 1 ? " ]" : "");
  }
  return o;
}
inline void _debug() { cerr << endl; }
template <class First, class... Rest>
void _debug(const First &first, const Rest &...rest) {
  cerr << first << " ";
  _debug(rest...);
}

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;

const double PI = (1 * acos(0.0));
const double EPS = 1e-9;
const int INF = 0x3f3f3f3f;
const ll INFL = 0x3f3f3f3f3f3f3f3fLL;
const ll mod = 1e9 + 7;

inline void finput(string filename) { freopen(filename.c_str(), "r", stdin); }

int main() {
  ios_base::sync_with_stdio(0);
  // finput("./input");
  int n;
  cin >> n;
  vector<string> ss(n);
  rep(i, n) cin >> ss[i];
  vector<pii> va;
  vector<pii> vb;
  rep(i, n) {
    string s = ss[i];
    int cnt = 0;
    int mi = 0;
    rep(j, s.size()) {
      if (s[j] == '(')
        cnt++;
      else
        cnt--;
      mi = min(mi, cnt);
    }
    if (cnt >= 0)
      va.emplace_back(-mi, cnt);
    else
      vb.emplace_back(-mi, cnt);
  }
  sort(all(va));
  sort(all(vb), [&](pii a, pii b) { return a.fi + a.se > b.fi + b.se; });
  int cnt = 0;
  auto count = [&](vector<pii> &v) {
    for (auto p : v) {
      if (p.fi > cnt)
        return false;
      cnt += p.se;
    }
    return true;
  };
  bool can = count(va) && count(vb);
  if (can & cnt == 0)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}

Error: WA

Fixed submission:

#include <bits/stdc++.h>
using namespace std;

#define REP(i, m, n) for (int i = (m); i < (int)(n); i++)
#define RREP(i, m, n) for (int i = (int)(n - 1); i >= m; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define fi first
#define se second
#define debug(...)                                                             \\
  {                                                                            \\
    cerr << "[L" << __LINE__ << "] ";                                          \\
    _debug(__VA_ARGS__);                                                       \\
  }

template <typename T1, typename T2>
ostream &operator<<(ostream &o, const pair<T1, T2> &p) {
  return o << "(" << p.first << ", " << p.second << ")";
}
template <typename T> string join(const vector<T> &v, string del = ", ") {
  stringstream s;
  for (auto x : v)
    s << del << x;
  return s.str().substr(del.size());
}
template <typename T> ostream &operator<<(ostream &o, const vector<T> &v) {
  if (v.size())
    o << "[" << join(v) << "]";
  return o;
}
template <typename T>
ostream &operator<<(ostream &o, const vector<vector<T>> &vv) {
  int l = vv.size();
  if (l) {
    o << endl;
    rep(i, l) o << (i == 0 ? "[ " : ",\\n  ") << vv[i]
                << (i == l - 1 ? " ]" : "");
  }
  return o;
}
inline void _debug() { cerr << endl; }
template <class First, class... Rest>
void _debug(const First &first, const Rest &...rest) {
  cerr << first << " ";
  _debug(rest...);
}

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;

const double PI = (1 * acos(0.0));
const double EPS = 1e-9;
const int INF = 0x3f3f3f3f;
const ll INFL = 0x3f3f3f3f3f3f3f3fLL;
const ll mod = 1e9 + 7;

inline void finput(string filename) { freopen(filename.c_str(), "r", stdin); }

int main() {
  ios_base::sync_with_stdio(0);
  // finput("./input");
  int n;
  cin >> n;
  vector<string> ss(n);
  rep(i, n) cin >> ss[i];
  vector<pii> va;
  vector<pii> vb;
  rep(i, n) {
    string s = ss[i];
    int cnt = 0;
    int mi = 0;
    rep(j, s.size()) {
      if (s[j] == '(')
        cnt++;
      else
        cnt--;
      mi = min(mi, cnt);
    }
    if (cnt >= 0)
      va.emplace_back(-mi, cnt);
    else
      vb.emplace_back(-mi, cnt);
  }
  sort(all(va));
  sort(all(vb), [&](pii a, pii b) { return a.fi + a.se > b.fi + b.se; });
  int cnt = 0;
  auto count = [&](vector<pii> &v) {
    for (auto p : v) {
      string s = ss[p.se];
      rep(j, s.size()) {
        if (s[j] == '(')
          cnt++;
        else
          cnt--;
        if (cnt < 0)
          return false;
      }
    }
    return true;
  };
  bool can = count(va) && count(vb);
  if (can & cnt == 0)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}