Language: C++

#include <bits/stdc++.h>

#define io ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define ll long long
#define ld long double
#define EPS (1e-15)
#define mod 1000000007
#define pii pair<ll, ll>
#define piii pair<ll, pii>
#define SIZE(x) (int) x.size()
#define to_string(x) static_cast<std::ostringstream&>((std::ostringstream() << std::dec << x)).str()
#define lp(i, a, n) for (int(i) = (a); (i) <= (int)(n); ++(i))
#define lpd(i, n, a) for (int(i) = (n); (i) >= (a); --(i))
#define bitcount(n) __builtin_popcountll(n)
#define readi(x) scanf("%d", &x);
#define readl(x) scanf("%lld", &x);
#define reads(x) scanf("%s", &x);
#define readc(x) scanf("%c", &x);
#define readd(x) scanf("%lf", &x);

using namespace std;
const int N = 200005;
const int K = (int)log2(N) + 2;
const ll infi = 1ll << 60;

int main() {
//  freopen("input.txt", "r", stdin);
//  freopen("output.txt", "w", stdout);
    io;
    ll a, b;
    string s;
    set<string> ss;
    map<string, int> cnts, cntt;
    cin >> a;
    while (a--) {
        cin >> s;
        ss.insert(s);
        ++cnts[s];
    }
    cin >> b;
    while (b--) {
        cin >> s;
        ++cntt[s];
    }
    ll ans = INT_MIN;
    for (auto x : ss)
        ans = max(ans, cnts[x] - cntt[x]);
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:47:18: error: no matching function for call to 'max(long long int&, std::map<std::__cxx11::basic_string<char>, int>::mapped_type)'
   47 |         ans = max(ans, cnts[x] - cntt[x]);
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~~
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:47:18: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'std::map<std::__cxx11::basic_string<char>, int>::mapped_type' {aka 'int'})
   47 |         ans = max(ans, cnts[x] - cntt[x]);
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~~
/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:47:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   47 |         ans = max(ans, cnts[x] - cntt[x]);
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~~