Language: C++

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

// Macros
#define PRAGMA(x) _Pragma(#x)
//
#define F  first
#define S  second
#define PB push_back
#define MP make_pair
//
#define ALL(container)   container.begin(),container.end()
#define MAKE_UNIQUE(vec) do { PRAGMA(message "DO NOT FORGET TO SORT THE VECTOR !!!"); vec.erase(unique(ALL(vec)),vec.end()); } while(0)
// vec.resize() sucks, use vec.assign()
// comparator -> return <

// Rename Datatypes
using ll  = long long;
using ld  = long double;
using pii = std::pair <int,int>;

// Output, Common Containers
template <typename T> ostream& operator << (ostream &os, const vector<T> &v) { for (T i : v) os << i << ' '; return os; }
template <typename T> ostream& operator << (ostream &os, const set<T> &v)    { for (T i : v) os << i << ' '; return os; }
template <typename T> ostream& operator << (ostream &os, const deque<T> &v)  { for (T i : v) os << i << ' '; return os; }
template <typename T, typename S> ostream& operator << (ostream &os, const pair<T,S> &v) { os << "(" << v.F << "=>" << v.S << ") "; return os; }
template <typename T, typename S> ostream& operator << (ostream &os, const map<T,S> &v)  { for (auto i : v) os << i << ' '; return os; }

// Debugging
#ifdef LOCAL
	#define trace(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); d__f(_it, args); }
	void d__f(__attribute__((unused)) istream_iterator<string> it) {}
	template<typename Head, typename... Tail> void d__f(istream_iterator<string> it, Head H, Tail... T) { cerr << *it << " <=> [" << H << "]\n"; d__f(++it, T...); }
#else
	#define trace(args...)
#endif


// CODE STARTS HERE

signed main() {
	std::ios::sync_with_stdio(false); //Warning: Do NOT use C I/O now.
	std::cin.tie(nullptr); //Note: Comment out this line for interactive questions.
	// std::cout.setf(std::ios::fixed); std::cout.precision(20); //Note: To output decimals correctly.

	// int tt; cin >> tt;
	// for(int test_no = 1; test_no <= tt; ++test_no){}

	int k;
	cin >> k;

	string s;
	cin >> s;

	for(int i = 0; i < min(k, s.size()), ++i)
		cout << s[i];

	if(k < s.size()) cout << "...";
	cout << "\n";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:56:31: error: no matching function for call to 'min(int&, std::__cxx11::basic_string<char>::size_type)'
   56 |         for(int i = 0; i < min(k, s.size()), ++i)
      |                            ~~~^~~~~~~~~~~~~
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:2:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:56:31: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'})
   56 |         for(int i = 0; i < min(k, s.size()), ++i)
      |                            ~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: 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:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:56:31: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   56 |         for(int i = 0; i < min(k, s.size()), ++i)
      |                            ~~~^~~~~~~~~~~~~
a.cc:56:49: error: expected ';' before ')' token
   56 |         for(int i = 0; i < min(k, s.size()), ++i)
      |                                                 ^
      |                                                 ;