Inversions

#include <bits/stdc++.h>
 
using namespace std;
 
int main(){
    string s;
    cin >> s;
    int n = s.length();
    int d1 = 0, d2 = 0;
    for(int i = 0; i < n; ++i){
        if(i%2 == 0){
            if(s[i] == '0')
                d1++;
            else
                d2++;
            
        }
        else {
         if(s[i] == '0')
                d2++;
            else
                d1++;
            
            
        }
        
    }
    cout << min(d1, d2) << endl;
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED