Language: C++

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<iomanip>
#include<vector>
#include<queue>
#include<deque>
#include<string>
#include<utility>
#include<cmath>
#include<algorithm>
#include<cctype>
#include<set>
#include<map>
#include<bitset>
#include<stack>
#include<ctime>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,int> pli;
typedef vector<int> vi;
typedef vector<pii> vpii;
typedef vector<pli> vpli;

#define fastio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file freopen("out.out","w",stdout);
#define RE cout<<233<<endl;
#define Tnum(x) cout<<x<<endl;
#define Tall(x,n) for(int i=0;i<n;i++)cout<<x[i]<<(i==n-1?"\n":" ");
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define REV(a) reverse(a.begin(),a.end())
#define SORT(a) sort(a.begin(),a.end())
#define inf (int)1e9
#define linf (ll)1e18
#define mod (inf+7)

string n;

int main() {
  fastio;
  cin>>n;
  if(n.size()==1){
  	cout<<n[0]-'0'<<endl;
  	return 0;
	}
	int cur=0;
	FOR(i,0,n.size())cur+=n[i]-'0';
  cout<<max(cur,(n.size()-1)*9+(n[0]-'1'))<<endl;
  
  
  
  
  
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:52:12: error: no matching function for call to 'max(int&, std::__cxx11::basic_string<char>::size_type)'
   52 |   cout<<max(cur,(n.size()-1)*9+(n[0]-'1'))<<endl;
      |         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 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:52:12: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'})
   52 |   cout<<max(cur,(n.size()-1)*9+(n[0]-'1'))<<endl;
      |         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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,
                 from a.cc:12:
/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:52:12: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   52 |   cout<<max(cur,(n.size()-1)*9+(n[0]-'1'))<<endl;
      |         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~