#include<iostream> #include<string> #include<cstring> using namespace std; typedef long long ll; int n,k=1,p=0,maxn=-; string s; int main() { cin>>n; cin>>s; s=s+s+s; for(int i=n;i<i+n&&i<3*n;)//枚举断点 { if(s[i]==s[i+1]||s[i]=='w') {k++;i++;p++;continue;} i=i-p; for(int j=i-1;j>=i-n;j--) { if(s[j]==s[j-1]||s[j]=='w') k++; } if(maxn<k) maxn=k; k=1; i++; } cout<<maxn; }
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