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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	string s;
  6.     cin>>s;
  7.     int n = s.size();
  8.     unordered_map<int,int> k; 
  9.     int cnt = 0;
  10.     for(int i=0;i<=n-1;i++){
  11.     if(s[i]=='B'){
  12.         cnt++;
  13.         k[i]++;
  14.     }
  15.    }
  16.      int ans = 0;
  17.  
  18.     for(int i = 0 ;i < s.size();i++){
  19.      int com = 0;
  20.       if(n%2 == 0){
  21.          for(int i = 0 ; i < n ;i = i+2){
  22.              if(k[i] == 'B')com++;
  23.          }
  24.  
  25.            for(int i = 1 ; i < n ;i = i+2){
  26.              if(k[i] == 'B')com++;
  27.          }
  28.          ans = n/2 - com; 
  29.         }else if(n%2 == 1){
  30.          if(cnt == n/2){
  31.            for(int i = 1 ; i < n ;i = i+2){
  32.              if(k[i] == 'B')com++;
  33.          }
  34.          ans = n/2 - com; 
  35.          }else if(cnt == (n/2+1)){
  36.           for(int i = 0 ; i < n ;i = i+2){
  37.              if(k[i] == 'B')com++;
  38.          }
  39.           ans = n/2 - com;
  40.          }
  41.      }else cout<<-1;
  42.     }
  43.    cout<<ans;      
  44. }
  45.  
  46.  
  47.  
Success #stdin #stdout 0s 5312KB
comments (?)
stdin
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BEEBB
stdout
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2
https://ideone.com/JsR8dU
language:
C++ (gcc 8.3)
created:
12 hours ago
visibility:
public

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