Problem p02680 (C++) — buggy submission, verdict: Runtime Error

// #define _GLIBCXX_DEBUG

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

#define endl '\\n'
#define lfs cout << fixed << setprecision(10)
#define ALL(a) (a).begin(), (a).end()
#define ALLR(a) (a).rbegin(), (a).rend()
#define spa << " " <<
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define EB emplace_back
#define rep(i, n, m) for (ll i = (n); i < (ll)(m); i++)
#define rrep(i, n, m) for (ll i = (ll)(m)-1; i >= (ll)(n); i--)
using ll = long long;
using ld = long double;
const ll MOD1 = 1e9 + 7;
const ll MOD9 = 998244353;
const int INF = 1e9;
using P = pair<ll, ll>;
template <typename T1, typename T2> bool chmin(T1 &a, T2 b) {
  if (a > b) {
    a = b;
    return true;
  } else
    return false;
}
template <typename T1, typename T2> bool chmax(T1 &a, T2 b) {
  if (a < b) {
    a = b;
    return true;
  } else
    return false;
}
ll median(ll a, ll b, ll c) {
  return a + b + c - max({a, b, c}) - min({a, b, c});
}
void ans1(bool x) {
  if (x)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
void ans2(bool x) {
  if (x)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}
void ans3(bool x) {
  if (x)
    cout << "Yay!" << endl;
  else
    cout << ":(" << endl;
}
template <typename T1, typename T2> void ans(bool x, T1 y, T2 z) {
  if (x)
    cout << y << endl;
  else
    cout << z << endl;
}
template <typename T> void debug(vector<vector<T>> &v, ll h, ll w) {
  for (ll i = 0; i < h; i++) {
    cout << v[i][0];
    for (ll j = 1; j < w; j++)
      cout spa v[i][j];
    cout << endl;
  }
};
void debug(vector<string> &v, ll h, ll w) {
  for (ll i = 0; i < h; i++) {
    for (ll j = 0; j < w; j++)
      cout << v[i][j];
    cout << endl;
  }
};
template <typename T> void debug(vector<T> &v, ll n) {
  if (n != 0)
    cout << v[0];
  for (ll i = 1; i < n; i++)
    cout spa v[i];
  cout << endl;
};
template <typename T> vector<vector<T>> vec(ll x, ll y, T w) {
  vector<vector<T>> v(x, vector<T>(y, w));
  return v;
}
ll gcd(ll x, ll y) {
  ll r;
  while (y != 0 && (r = x % y) != 0) {
    x = y;
    y = r;
  }
  return y == 0 ? x : y;
}
vector<ll> dx = {1, 0, -1, 0, 1, 1, -1, -1};
vector<ll> dy = {0, 1, 0, -1, 1, -1, 1, -1};
template <typename T> vector<T> make_v(size_t a, T b) {
  return vector<T>(a, b);
}
template <typename... Ts> auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v(ts...))>(a, make_v(ts...));
}
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
  return os << p.first << " " << p.second;
}
// mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());
struct z {
  ll x, y, d;
  z(ll a, ll b, ll c) : x(a), y(b), d(c){};
};
vector<vector<int>> dist(4005, vector<int>(4005, INF));
void bfs(ll h, ll w, ll sx, ll sy, vector<vector<vector<bool>>> &t) {
  rep(i, 0, h) rep(j, 0, w) dist[i][j] = INF;
  queue<struct z> que;
  que.emplace(sx, sy, 0);
  while (!que.empty()) {
    auto pos = que.front();
    que.pop();
    if (dist[pos.x][pos.y] != INF)
      continue;
    dist[pos.x][pos.y] = pos.d;
    for (ll i = 0; i < 4; i++) {
      if (!t[pos.x][pos.y][i])
        continue;
      ll x = pos.x + dx[i], y = pos.y + dy[i], d = pos.d + 1;
      if (x < 0 || x >= h || y < 0 || y >= w)
        continue;
      que.emplace(x, y, d);
    }
  }
}
template <typename T> map<T, ll> compress(vector<T> &v) {
  sort(ALL(v));
  v.erase(unique(ALL(v)), v.end());
  map<T, ll> ret;
  for (ll i = 0; i < (ll)v.size(); i++)
    ret[v[i]] = i;
  return ret;
}
int main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  ll res = 0, buf = 0;
  bool judge = true;
  ll n, m;
  cin >> n >> m;
  vector<ll> a(n), b(n), c(n);
  rep(i, 0, n) cin >> a[i] >> b[i] >> c[i];
  vector<ll> d(m), e(m), f(m);
  rep(i, 0, m) cin >> d[i] >> e[i] >> f[i];
  vector<ll> valx, valy;
  rep(i, 0, n) {
    valx.PB(a[i]);
    valx.PB(b[i]);
    valy.PB(c[i]);
  }
  rep(i, 0, m) {
    valx.PB(d[i]);
    valy.PB(e[i]);
    valy.PB(f[i]);
  }
  valx.PB(0);
  valy.PB(0);
  valx.PB(2e9);
  valy.PB(2e9);
  valx.PB(-2e9);
  valy.PB(-2e9);
  auto mpx = compress(valx);
  auto mpy = compress(valy);
  ll h = (ll)mpx.size() - 1;
  ll w = (ll)mpy.size() - 1;
  // vector<ll>dx={1,0,-1,0,1,1,-1,-1};
  // vector<ll>dy={0,1,0,-1,1,-1,1,-1};
  auto t = make_v(h, w, 4, true);
  rep(i, 0, n) {
    ll ux = mpx[a[i]], vx = mpx[b[i]], y = mpy[c[i]];
    rep(j, ux, vx) {
      t[j][y][3] = false;
      t[j][y - 1][1] = false;
    }
  }
  rep(i, 0, m) {
    ll x = mpx[d[i]], uy = mpy[e[i]], vy = mpy[f[i]];
    rep(j, uy, vy) {
      t[x][j][2] = false;
      t[x - 1][j][0] = false;
    }
  }
  bfs(h, w, mpx[0], mpy[0], t);
  rep(i, 0, h) rep(j, 0, w) {
    if (dist[i][j] != INF) {
      if (i == 0 || i == h - 1 || j == 0 || j == w - 1)
        judge = false;
      res += (valx[i + 1] - valx[i]) * (valy[j + 1] - valy[j]);
    }
  }
  ans(!judge, "INF", res);
  return 0;
}

Error: 0

Fixed submission:

// #define _GLIBCXX_DEBUG

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

#define endl '\\n'
#define lfs cout << fixed << setprecision(10)
#define ALL(a) (a).begin(), (a).end()
#define ALLR(a) (a).rbegin(), (a).rend()
#define spa << " " <<
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define EB emplace_back
#define rep(i, n, m) for (ll i = (n); i < (ll)(m); i++)
#define rrep(i, n, m) for (ll i = (ll)(m)-1; i >= (ll)(n); i--)
using ll = long long;
using ld = long double;
const ll MOD1 = 1e9 + 7;
const ll MOD9 = 998244353;
const int INF = 1e9;
using P = pair<ll, ll>;
template <typename T1, typename T2> bool chmin(T1 &a, T2 b) {
  if (a > b) {
    a = b;
    return true;
  } else
    return false;
}
template <typename T1, typename T2> bool chmax(T1 &a, T2 b) {
  if (a < b) {
    a = b;
    return true;
  } else
    return false;
}
ll median(ll a, ll b, ll c) {
  return a + b + c - max({a, b, c}) - min({a, b, c});
}
void ans1(bool x) {
  if (x)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
void ans2(bool x) {
  if (x)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}
void ans3(bool x) {
  if (x)
    cout << "Yay!" << endl;
  else
    cout << ":(" << endl;
}
template <typename T1, typename T2> void ans(bool x, T1 y, T2 z) {
  if (x)
    cout << y << endl;
  else
    cout << z << endl;
}
template <typename T> void debug(vector<vector<T>> &v, ll h, ll w) {
  for (ll i = 0; i < h; i++) {
    cout << v[i][0];
    for (ll j = 1; j < w; j++)
      cout spa v[i][j];
    cout << endl;
  }
};
void debug(vector<string> &v, ll h, ll w) {
  for (ll i = 0; i < h; i++) {
    for (ll j = 0; j < w; j++)
      cout << v[i][j];
    cout << endl;
  }
};
template <typename T> void debug(vector<T> &v, ll n) {
  if (n != 0)
    cout << v[0];
  for (ll i = 1; i < n; i++)
    cout spa v[i];
  cout << endl;
};
template <typename T> vector<vector<T>> vec(ll x, ll y, T w) {
  vector<vector<T>> v(x, vector<T>(y, w));
  return v;
}
ll gcd(ll x, ll y) {
  ll r;
  while (y != 0 && (r = x % y) != 0) {
    x = y;
    y = r;
  }
  return y == 0 ? x : y;
}
vector<ll> dx = {1, 0, -1, 0, 1, 1, -1, -1};
vector<ll> dy = {0, 1, 0, -1, 1, -1, 1, -1};
template <typename T> vector<T> make_v(size_t a, T b) {
  return vector<T>(a, b);
}
template <typename... Ts> auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v(ts...))>(a, make_v(ts...));
}
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
  return os << p.first << " " << p.second;
}
// mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());
struct z {
  ll x, y, d;
  z(ll a, ll b, ll c) : x(a), y(b), d(c){};
};
vector<vector<int>> dist(4005, vector<int>(4005, INF));
void bfs(ll h, ll w, ll sx, ll sy, vector<vector<vector<bool>>> &t) {
  rep(i, 0, h) rep(j, 0, w) dist[i][j] = INF;
  queue<struct z> que;
  que.emplace(sx, sy, 0);
  while (!que.empty()) {
    auto pos = que.front();
    que.pop();
    if (dist[pos.x][pos.y] != INF)
      continue;
    dist[pos.x][pos.y] = pos.d;
    for (ll i = 0; i < 4; i++) {
      if (!t[pos.x][pos.y][i])
        continue;
      ll x = pos.x + dx[i], y = pos.y + dy[i], d = pos.d + 1;
      if (x < 0 || x >= h || y < 0 || y >= w)
        continue;
      que.emplace(x, y, d);
    }
  }
}
template <typename T> map<T, ll> compress(vector<T> &v) {
  sort(ALL(v));
  v.erase(unique(ALL(v)), v.end());
  map<T, ll> ret;
  for (ll i = 0; i < (ll)v.size(); i++)
    ret[v[i]] = i;
  return ret;
}
int main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  ll res = 0, buf = 0;
  bool judge = true;
  ll n, m;
  cin >> n >> m;
  vector<ll> a(n), b(n), c(n);
  rep(i, 0, n) cin >> a[i] >> b[i] >> c[i];
  vector<ll> d(m), e(m), f(m);
  rep(i, 0, m) cin >> d[i] >> e[i] >> f[i];
  vector<ll> valx, valy;
  rep(i, 0, n) {
    valx.PB(a[i]);
    valx.PB(b[i]);
    valy.PB(c[i]);
  }
  rep(i, 0, m) {
    valx.PB(d[i]);
    valy.PB(e[i]);
    valy.PB(f[i]);
  }
  valx.PB(0);
  valy.PB(0);
  valx.PB(2e9);
  valy.PB(2e9);
  valx.PB(-2e9);
  valy.PB(-2e9);
  auto mpx = compress(valx);
  auto mpy = compress(valy);
  ll h = (ll)mpx.size() - 1;
  ll w = (ll)mpy.size() - 1;
  // vector<ll>dx={1,0,-1,0,1,1,-1,-1};
  // vector<ll>dy={0,1,0,-1,1,-1,1,-1};
  auto t = make_v(h, w, 4, true);
  rep(i, 0, n) {
    ll ux = mpx[a[i]], vx = mpx[b[i]], y = mpy[c[i]];
    rep(j, ux, vx) {
      t[j][y][3] = false;
      t[j][y - 1][1] = false;
    }
  }
  rep(i, 0, n) {
    ll x = mpx[d[i]], uy = mpy[e[i]], vy = mpy[f[i]];
    rep(j, uy, vy) {
      t[x][j][2] = false;
      t[x - 1][j][0] = false;
    }
  }
  bfs(h, w, mpx[0], mpy[0], t);
  rep(i, 0, h) rep(j, 0, w) {
    if (dist[i][j] != INF) {
      if (i == 0 || i == h - 1 || j == 0 || j == w - 1)
        judge = false;
      res += (valx[i + 1] - valx[i]) * (valy[j + 1] - valy[j]);
    }
  }
  ans(!judge, "INF", res);
  return 0;
}