Language: C++

#include <bits/stdc++.h>
using namespace std;
#define ull unsigned long long
#define MOD (int)(1e9+7)
#define ceil(x, y) (x%y==0? (x/y) : (x/y+1))
#define FOR(i, N) for(int i = 0; i < N; ++i)
#define FOR1(i, N) for(int i = 1; i <= N; ++i)
#define vi vector <int>
#define pii pair <int, int>
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define mset(a, v) memset(a, v, sizeof(a))
#define all(v) (v).begin(), (v).end()
#define INF 2e9
#define EPS 1e-9
#define int long long
/*#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
typedef cc_hash_table<int, int, hash<int>> ht; // while using, comment #define int long long  */

void __print(int x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define dbg(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif
using namespace std;
#define MAX 3009
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #ifndef ONLINE_JUDGE
        freopen("in5.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    #endif
    int T=1;
    // cin >> T;
    FOR1(tt, T){
        // cout << "Case #" << tt << ": ";
        int h, w, m;
        cin >> h >> w >> m;
        set<pii> st;
        map<int, int> mh, mw;
        FOR1(i, m){
            int hi, wi; cin >> hi >> wi;
            mh[hi]++;
            mw[wi]++;
            st.insert({hi, wi});
        }
        int maxi = 0;
        for(pii p1 : mh){
            for(pii p2 : mw){
                maxi = max(maxi, p1.ss + p2.ss - st.count({p1.ff, p2.ff}));
            }
        }
        // dbg(mh, mw);
        // dbg(st);

        // vector<pii> vh, vw;
        // for(pii p : mh){
        //     vh.emplace_back((p.ss, p.ff));
        // }
        // for(pii p : mw){
        //     vw.emplace_back((p.ss, p.ff));
        // }
        // sort(all(vh)); reverse(all(vh));
        // sort(all(vw)); reverse(all(vw));

        cout << maxi;
        cout << '\n';
    }
    return 0;
}


Compiler output:
a.cc: In function 'int32_t main()':
a.cc:73:27: error: no matching function for call to 'max(long long int&, long long unsigned int)'
   73 |                 maxi = max(maxi, p1.ss + p2.ss - st.count({p1.ff, p2.ff}));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:73:27: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long long unsigned int')
   73 |                 maxi = max(maxi, p1.ss + p2.ss - st.count({p1.ff, p2.ff}));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:73:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   73 |                 maxi = max(maxi, p1.ss + p2.ss - st.count({p1.ff, p2.ff}));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~