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- #include <cstdint>
- #include <iostream>
- #include <optional>
- #include <limits>
- using namespace std;
- template <typename T>
- optional<T> SafeAdd(T a, T b) {
- if (a > 0 && b > 0) {
- if (a > std::numeric_limits<T>::max() - b) {
- return nullopt;
- }
- }
- if (a < 0 && b < 0) {
- if (a < std::numeric_limits<T>::min() - b) {
- return nullopt;
- }
- }
- return a + b;
- }
- int main() {
- int64_t a;
- int64_t b;
- cin >> a >> b;
- auto res = SafeAdd(a, b);
- if (res.has_value()) {
- cout << res.value() << endl;
- }
- else {
- cout << "Overflow!" << endl;
- }
- }
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