Language: C++

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
typedef long long ll;
#define rep(i,n) for (int i = 0; i < (n); i++)
#define repe(i,n) for (int i = 0; i <= (n); ++i)
#define repe1(i,n) for (int i = 0; i <= (n); ++i)
#define all(x) (x).begin(),(x).end()
#define pb(x) push_back(x)
#define eb(k,v) emplace_back(k,v)
#define ct(res) cout << res << "\n";
#define vi vector<int>
#define vl vector<ll>
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
const int INF = 1e9;
const ll MOD = 1000000007;
using Graph = vector<vector<int>>;


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string n; cin >> n;
    rep(i,n) {
        if (n[i]=='7') {
            ct("Yes");
            return 0;
        }
    }
    ct("No");
}



Compiler output:
a.cc: In function 'int main()':
a.cc:4:36: error: no match for 'operator<' (operand types are 'int' and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                    ^ ~~~
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:2:
/usr/include/c++/14/bits/regex.h:1143:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator<(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1143 |     operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1143:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/regex.h:1224:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1224 |     operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1224:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/regex.h:1317:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1317 |     operator<(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1317:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/regex.h:1391:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1391 |     operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1391:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/regex.h:1485:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1485 |     operator<(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1485:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/regex.h:1560:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1560 |     operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1560:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/regex.h:1660:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1660 |     operator<(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1660:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/string_view:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
    4 | #define rep(i,n) for (int i = 0; i < (n); i++)
      |                                        ^
a.cc:25:5: note: in expansion of macro 'rep'
   25 |     rep(i,n) {
      |     ^~~
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:4:40: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>