Inversions

input/code.cpp: In function 'int main()':
input/code.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for (int i=1; i<s.size(); i++) {
               ~^~~~~~~~~

#include <bits/stdc++.h>
#include <string>
#include <vector>

using namespace std;


int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);

string s;
cin >> s;
int n = 0;

for (int i=1; i<s.size(); i++) {
    if (s[i-1] == s[i]) {
        if (s[i] == '0') {
            s[i] = '1';
        } else {
            s[i] = '0';
        }
        n++;
    }
}
    
cout << n << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED