题解 | BFS
BFS
https://www.nowcoder.com/practice/22da7730da5d4a129a188ba24d22f2bf
#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
cin>>s;
int a,ans=-1;
a=s.size();
for(int i=0;i<a;i++)
if(s[i]=='b'||s[i]=='B')
if(s[i+1]=='o'||s[i+1]=='O')
if(s[i+2]=='b'||s[i+2]=='B'){
ans=i;
break;
}
cout<<ans;
}
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