Submission #1229173

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229173		1zaid1	Rack (eJOI19_rack)	Pypy 3	0 / 100	189 ms	125080 KiB

rack

M = 1000000007
p = [1]
for i in range(1000000):
    p.append(2*p[-1]%M)

def f(n, x):
    if (n == 1):
        return x

    if x%2 == 1:
        return f(n//2, (x+1)//2)
    else:
        return (p[n] + f(n//2, x//2))%M

k, x = input().split(' ')
x = int(x)
k = int(k)
print(f(pow(2, k-1), x))

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