tenis.cpp

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

int main() {
    
    int n; 
    string s; 
    cin >> n; 
    cin >> s; 

    int sets0 = 0, sets1 = 0; 
    int qtd0 = 0, qtd1 = 0; 
    
    for (int i=0; i<s.size(); i++) { 

        if (s[i] == '0') qtd0++; 
        else qtd1++;

        if (qtd0 == 2) { 
            sets0++; 
            qtd0 = qtd1 = 0; 
        } else if (qtd1 == 2) { 
            sets1++; 
            qtd0 = qtd1 = 0; 
        } 
    } 
    
    if (sets0 == sets1) cout << -1 << endl;
    else cout << (sets0 > sets1 ? 0 : 1) << endl; 
}