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- #include <iostream>
- using namespace std;
- int main() {
- unsigned long long a, b;
- b = 0;
- int k;
- cin >> a >> k;
- while (k >= 0) {
- if (a & (1 << k))
- b |= (1 << k);
- --k;
- }
- cout << b;
- }
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