1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
#include <bits/stdc++.h>

int main() {
	long long answer = 0;
	std::string a, b, c;

	std::cin >> a >> b >> c;
	int n = a.size();

	auto info = [&](int i) -> std::pair<int, int> {
		int da, db, dc;
		da = a[i] - '0';
		db = b[i] - '0';
		dc = c[i] - '0';
		return {da + db, dc};
	};

	long long block_cnt = 0;
	int carry = 0;
	for (int i = 0; i < n; i++) {
		auto [da, dc] = info(i);
		if (carry) {
			if (da >= 10 && da == 10 + dc) {
				carry = 0;
				block_cnt++;
			} else if (da + 1 >= 10 && da + 1 == 10 + dc) {
			} else {
				carry = 0;
				answer += ((block_cnt) * (block_cnt + 1)) / (long long)2;
				block_cnt = 0;
				i--;
			}
		} else {
			if (da == dc) {
				block_cnt++;
			} else if (da + 1 == dc) {
				carry = 1;
			} else {
				answer += ((block_cnt) * (block_cnt + 1)) / (long long)2;
				block_cnt = 0;
			}
		}
	}

	answer += ((block_cnt) * (block_cnt + 1)) / (long long)2;

	std::cout << answer << "\n";
}