Language: C++

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <math.h>
#include <string>
using namespace std;

#define REP(i,n) for (int i=0;i<(n);i++)
#define PII pair<int,int>
#define LL long long
#define vi vector<int>

int main() {
    string s;
    LL dist, min, chain;

    while (1) {
        bool firstchain = true;
        dist = 0;
        min = -1;
        chain = 0;

        cin >> s;

        REP(i, s.length()) {
            char c = s.at(i);
            if (c == '0') {
                if (chain > 0) firstchain = false;
                dist++;
            }
            else if (c == '1') {
                if (dist > 0) {
                    if (dist < min || min == -1) min = dist;
                }
                if (!firstchain) chain = -1;
                else chain++;
            }
            dist = 0;
        }

        if (dist < min || min == -1) min = dist;

        if (min + 1 == s.length()) min--;
        if (chain > 0)  chain = max(s.length() - chain, chain);
        cout << max(chain, min + 1) << endl;


    }

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:45:36: error: no matching function for call to 'max(long long unsigned int, long long int&)'
   45 |         if (chain > 0)  chain = max(s.length() - chain, chain);
      |                                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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:45:36: note:   deduced conflicting types for parameter 'const _Tp' ('long long unsigned int' and 'long long int')
   45 |         if (chain > 0)  chain = max(s.length() - chain, chain);
      |                                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:4:
/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:45:36: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long unsigned int'
   45 |         if (chain > 0)  chain = max(s.length() - chain, chain);
      |                                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~