Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define mp make_pair
#define pb push_back
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)


int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);

  string s;
  cin >> s;
  ll k;
  cin >> k;
  ll n=s.size();
  if(n==1){
    cout << k/2 << endl;
    return 0;    
  }
  if(k==1){
    ll ttans=0;
    rep(i,n-1){
      if(s[i]==s[i+1]){
	ttans++;
	i++;
      }
    }
    cout << ttans << endl;
    return 0;    
  }
  ll tans=0;
  ll ans=0;
  bool nxt=false;
  s += s[0];
  rep(i,n){
    if(s[i]==s[i+1]){
      tans++;
      if(i+1==n){
	nxt=true;
      }
      i++;
    }
  }
  if(!nxt){
    ans = tans*k;
    cout << ans << endl;
    return 0;
  }
  ll tans2=0;
  nxt=false;
  rep1(i,n-1){
    if(s[i]==s[i+1]){
      tans2++;
      if(i+1==n){
	nxt=true;
      }
      i++;
    }
  }
  if(nxt){
    ans=tans*k-1;
    cout << max(ans,0) << endl;
  }
  else{
    ans=(tans+tans2)*(k/2) + (k%2)*(tans-1);
    cout << max(ans,0) << endl;
  }
  
  
  return 0;
    

}


Compiler output:
a.cc: In function 'int main()':
a.cc:65:16: error: no matching function for call to 'max(ll&, int)'
   65 |     cout << max(ans,0) << endl;
      |             ~~~^~~~~~~
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:65:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   65 |     cout << max(ans,0) << 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:
/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:65:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   65 |     cout << max(ans,0) << endl;
      |             ~~~^~~~~~~
a.cc:69:16: error: no matching function for call to 'max(ll&, int)'
   69 |     cout << max(ans,0) << endl;
      |             ~~~^~~~~~~
/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:69:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   69 |     cout << max(ans,0) << 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
/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:69:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   69 |     cout << max(ans,0) << endl;
      |             ~~~^~~~~~~