Problem p02580 (C++) — buggy submission, verdict: Runtime Error

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

using ll = long long;
using ld = long double;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vvvi = vector<vector<vector<int>>>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vvvl = vector<vector<vector<ll>>>;
using vs = vector<string>;
using vb = vector<bool>;
#define FOR(i, m, n) for (int i = (m); i < (n); i++)
#define FORR(i, m, n) for (int i = (m); i >= (n); i--)
#define REP(i, n) FOR(i, 0, (n))
#define REPR(i, n) FORR(i, (n)-1, 0)
#define REP1(i, n) FOR(i, 1, (n) + 1)
#define REPS(c, s) for (char c : s)
#define ALL(c) (c).begin(), (c).end()
#define SORT(c) sort(ALL(c))
#define REV(c) reverse(ALL(c))
#define sz(v) (int)v.size()
#define endl '\\n'
template <class T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> inline void prn(vector<T> &v) {
  int n = sz(v);
  REP(i, n) cout << v[i] << ' ';
}
template <class T> inline void printv(vector<T> &v) {
  int n = sz(v);
  REP(i, n) cout << v[i] << (i == n - 1 ? endl : ' ');
}
template <class T> inline void printvv(vector<vector<T>> &v) {
  for (auto u : v)
    printv(u);
}
template <class T> inline void printlnv(vector<T> &v) {
  int n = sz(v);
  REP(i, n) cout << v[i] << endl;
}
const int MOD = 1000000007;
const int INF = 1000000001;
const ll LINF = 1000000001000000001LL;

void solve();

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout << fixed << setprecision(numeric_limits<double>::max_digits10);
  solve();
  return 0;
}

void solve() {
  int h, w, m;
  cin >> h >> w >> m;
  set<pair<int, int>> g;
  vi r(h);
  vi c(w);
  int u, v;
  int rmx = 0;
  int cmx = 0;
  REP(i, m) {
    cin >> u >> v;
    u--;
    v--;
    r[u]++;
    c[v]++;
    chmax(rmx, r[u]);
    chmax(cmx, c[v]);
    g.emplace(u, v);
  }

  vi ri;
  vi ci;
  REP(i, h) if (rmx == r[i]) ri.emplace_back(i);
  REP(i, w) if (cmx == c[i]) ci.emplace_back(i);

  for (auto ridx : ri)
    for (auto cidx : ci) {
      if (g.count({ridx, cidx}) == 0) {
        cout << rmx + cmx << endl;
        return;
      }
    }
  cout << rmx + cmx - 1 << endl;
}


Error: 0

Fixed submission:

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

using ll = long long;
using ld = long double;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vvvi = vector<vector<vector<int>>>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vvvl = vector<vector<vector<ll>>>;
using vs = vector<string>;
using vb = vector<bool>;
#define FOR(i, m, n) for (int i = (m); i < (n); i++)
#define FORR(i, m, n) for (int i = (m); i >= (n); i--)
#define REP(i, n) FOR(i, 0, (n))
#define REPR(i, n) FORR(i, (n)-1, 0)
#define REP1(i, n) FOR(i, 1, (n) + 1)
#define REPS(c, s) for (char c : s)
#define ALL(c) (c).begin(), (c).end()
#define SORT(c) sort(ALL(c))
#define REV(c) reverse(ALL(c))
#define sz(v) (int)v.size()
#define endl '\\n'
template <class T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> inline void prn(vector<T> &v) {
  int n = sz(v);
  REP(i, n) cout << v[i] << ' ';
}
template <class T> inline void printv(vector<T> &v) {
  int n = sz(v);
  REP(i, n) cout << v[i] << (i == n - 1 ? endl : ' ');
}
template <class T> inline void printvv(vector<vector<T>> &v) {
  for (auto u : v)
    printv(u);
}
template <class T> inline void printlnv(vector<T> &v) {
  int n = sz(v);
  REP(i, n) cout << v[i] << endl;
}
const int MOD = 1000000007;
const int INF = 1000000001;
const ll LINF = 1000000001000000001LL;

void solve();

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout << fixed << setprecision(numeric_limits<double>::max_digits10);
  solve();
  return 0;
}

void solve() {
  int h, w, m;
  cin >> h >> w >> m;
  vvi g(h, vi(w));
  vi r(h);
  vi c(w);
  int u, v;
  int rmx = 0;
  int cmx = 0;
  REP(i, m) {
    cin >> u >> v;
    u--;
    v--;
    r[u]++;
    c[v]++;
    chmax(rmx, r[u]);
    chmax(cmx, c[v]);
    g[u][v]++;
  }

  vi ri;
  vi ci;
  REP(i, h) if (rmx == r[i]) ri.emplace_back(i);
  REP(i, w) if (cmx == c[i]) ci.emplace_back(i);

  SORT(r);
  SORT(c);
  for (auto ridx : ri)
    for (auto cidx : ci) {
      if (g[ridx][cidx] == 0) {
        cout << rmx + cmx << endl;
        return;
      }
    }
  cout << rmx + cmx - 1 << endl;
}