Codeforces Round #505 C. Plasticine zebra(思维)

#include <bits/stdc++.h>
using namespace std;
string str;

int main()
{
  cin>>str;
  int len = str.length();
  if(len == 1){
    puts("1");
    return 0;
  }
  str += str;
  int sum = 1;
  int ans = -1;
  for(int i=1;i<len*2;i++){
    if(str[i] != str[i-1])sum++;
    else{
      ans = max(ans,sum);
      sum = 1;
    }
  }
  ans = max(ans,sum);
  if(ans > len)ans = len;
  cout<<ans<<endl;
  return 0;
}