Submission #1220551

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220551		durdona	Rack (eJOI19_rack)	Pypy 3	0 / 100	134 ms	48788 KiB

rack

mod=10**9+7
def rec(i,j):
    if i == 1:return 1
    if j%2 == 0:
        return rec(i-1,j//2)%mod+pow(2,i-1,mod)
    else:
        return rec(i-1,j//2+1)%mod
n,k=map(int,input().split())
print(rec(n,k)%mod)

Compilation message (stdout)

Compiling 'rack.py'...

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  adding: __main__.pyc (deflated 31%)

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• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 60