Inversions

input/code.cpp: In function 'int main()':
input/code.cpp:13:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < s.size(); i++) {
                  ~~^~~~~~~~~~

#include <iostream>
#include <cmath>
#include <string>

using namespace std;

typedef long long LL;

int main(){
	string s; cin >> s;
	int zer = 0;
	int one = 0;
	for (int i = 0; i < s.size(); i++) {
		if (s[i] == '0' && (i % 2) == 1) zer++;
		if (s[i] == '1' && (i % 2) == 0) zer++;
		if (s[i] == '0' && (i % 2) == 0) one++;
		if (s[i] == '1' && (i % 2) == 1) one++;
	}
	cout << min(zer, one);
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED