Bittijono

#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	vector<char> jono;
	string line;
	cin >> line;
	unsigned long n = line.length();
	for (unsigned int i = 0; i < n; i++) jono.push_back(line[i] == '0' ? 0 : 1);

	unsigned long count = 0;
	for (unsigned int i = 0; i < n; i++) {
		int c = 0;
		for (unsigned int j = i; j < n; j++) {
			c += jono[j];
			count += !(c % 2);
		}
	}
	cout << count << '\n';
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 1

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 18

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 19

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 20

Group: 3

Verdict: ACCEPTED

Test 21

Group: 3

Verdict: ACCEPTED