Bittilista

#include <bits/stdc++.h>

#define i64 long long
#define u64 unsigned long long
#define i32 int
#define u32 unsigned int

#define pii pair<int, int>
#define pll pair<long long, long long>

#define defmod 1000000007
using namespace std;
i64 n, k; 
void ans(i64 i){
	
	for(i64 j = n-1; j >= 0; j--){
		if(i&(1LL<<j))
			cout << "1";
		else
			cout << "0";

	}
	cout << endl;
}
int main(){
	cin.sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> k;
	
	if(k >= 1LL<<(n-2)){
		ans(k*2-1);
	}
	else
		ans(k*2-2);
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED