```cpp #include <iostream> using namespace std; int main() { int a, b; cin >> a >> b; int n = a + b; int count = 0; if (n < 0) n = -n; do { if (n % 10 == 2) count++; n /= 10; } while (n > 0); cout << count; return 0; } ``` ######[AI问答 | 122点数解答 | 2026-04-12 15:40:55]