Language: C++

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <queue>
#include <stack>
#include <cstdlib>
#include <map>
#include <iomanip>
#include <set>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define int long long
#define pie 3.141592653589793238462643383279
#define mod 1000000007
#define INF 1145141919364364
#define all(vec) vec.begin(),vec.end()
#define ggr getchar(); getchar();return 0;
#define ll long long
#define P pair<int,int>
#define S second
#define F first
int gcd(int x, int y) {
	if (y == 0)return x;
	return gcd(y, x%y);
}
int lcm(int x, int y) {
	return x / gcd(x, y)*y;
}
bool prime(int x) {
	for (int i = 2; i <= sqrt(x); i++) {
		if (x%i == 0)return false;
	}
	return true;
}

int kai(int x) {
	if (x == 1)return 1;
	return kai(x - 1)*x%mod;
}

int mod_pow(int x, int y, int moder) {
	int res = 1;
	while (y > 0) {
		if (y & 1)res = res * x%moder;
		x = x * x%moder;
		y >>= 1;
	}
	return res;
}

int comb(int x, int y) {
	if (y > x)return 0;
	if (x == y)return 1;
	return kai(x)* mod_pow(kai(x - y), mod - 2, mod) % mod * mod_pow(kai(y), mod - 2, mod) % mod;
}

string s;
int ans = INF;

signed main() {
	cin >> s;
	rep(i, s.size() - 1) {
		if (s[i] != s[i + 1])ans = min(ans, max(i + 1, s.size() - i - 1));
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:66:56: error: no matching function for call to 'max(long long int, long long unsigned int)'
   66 |                 if (s[i] != s[i + 1])ans = min(ans, max(i + 1, s.size() - i - 1));
      |                                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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:66:56: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long long unsigned int')
   66 |                 if (s[i] != s[i + 1])ans = min(ans, max(i + 1, s.size() - i - 1));
      |                                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/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:3:
/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:66:56: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   66 |                 if (s[i] != s[i + 1])ans = min(ans, max(i + 1, s.size() - i - 1));
      |                                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~