Language: C++

#include<iostream>
#include<stdio.h>
#include<string>
#include<vector>
#include<map>
#include<tuple>
#include<algorithm>
#include<cmath>
#include<limits>
#include<set>
#include<queue>
using namespace std;
#define int long  long int
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
int lcm(int a, int b) { return a / gcd(a, b) * b; }
typedef pair<int, int>P;
const int INF = 1e15;
const int MOD = 1e9 + 7;
const double PI = 3.14159265358979323846;

signed main() {
	string s;
	cin >> s;
	int ans = INF;
	for (int i = s.size() - 1; i >= 0; i--) {
		vector<int>v;
		int cnt = 0;
		for(int j = 1; j <= i; j++) {
			if (s[i - j] != s[i])cnt++;
			else {
				v.push_back(cnt);
				cnt = 0;
			}
		}
		v.push_back(cnt);
		sort(v.begin(), v.end());
		int top = v[v.size() - 1];
		int num = max(s.size() - 1 - i, top);
		ans = min(ans, num);
	}
	cout << ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:39:30: error: no matching function for call to 'max(long long unsigned int, long long int&)'
   39 |                 int num = max(s.size() - 1 - i, top);
      |                           ~~~^~~~~~~~~~~~~~~~~~~~~~~
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:39:30: note:   deduced conflicting types for parameter 'const _Tp' ('long long unsigned int' and 'long long int')
   39 |                 int num = max(s.size() - 1 - i, top);
      |                           ~~~^~~~~~~~~~~~~~~~~~~~~~~
/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:7:
/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:39:30: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long unsigned int'
   39 |                 int num = max(s.size() - 1 - i, top);
      |                           ~~~^~~~~~~~~~~~~~~~~~~~~~~