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OI-codes/Luogu/P5657/P5657.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
unsigned long long n, k;
cin >> n >> k;
while ((--n) + 1) {
if ((1ull << n) - 1 < k) {
printf("1");
k = (1ull << n) - k + (1ull << n) - 1;
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} else {
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printf("0");
}
}
cout << endl;
return 0;
}