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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.     int L,O;
  8.     string s;
  9.     cin >> s;
  10.     for(int i=0;i<n;i++){
  11.     	if(s[i] == 'L')
  12.     		L++;
  13.     	else
  14.     		O++;
  15.     }
  16.     if(L % 2 != 0 && O % 2 != 0)
  17.     	cout << n/2 << endl;
  18.     else{
  19.     	int l = 1;
  20.  
  21.     	for(int j=1;j<s.size();j++){
  22.     		int L_left = 0, L_right = 0, O_left = 0, O_right = 0;
  23.     		int l = j;
  24.     		for(int i=0;i<l;i++){
  25.     			if(s[i] == 'L')
  26.     				L_left++;
  27.     			else
  28.     				O_left++;
  29.     		}
  30.     		for(int i=l;i<s.size();i++){
  31.     			if(s[i] == 'L')
  32.     				L_right++;
  33.     			else
  34.     				O_right++;
  35.     		}
  36.     		//cout << L_left <<" "<< L_right << " " << O_left << " " << O_right << endl; 
  37.     		if(L_left != L_right &&  O_left != O_right){
  38.     			cout << l << endl;
  39.     			return 0;
  40.     		}
  41.     		l++;
  42.     	}
  43.     	cout << "-1";
  44.     }
  45. 	return 0;
  46. }
  47.  
Success #stdin #stdout 0s 5272KB
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stdin
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10
LLOOOOLLLO
stdout
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5
https://ideone.com/qaVQxJ
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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