msalahi
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| import time | |
| bound,mem = 1000000,{} | |
| def collatz(n): | |
| if n==1: return [1] | |
| else: return [n] + collatz(n/2 if (n%2==0) else 3*n+1) if (n>1) else [1] | |
| def collatzCount(n): | |
| if n not in mem: mem[n]= 1 + collatzCount(n/2 if (n%2==0) else 3*n+1) if (n>1) else 1 | |
| return mem[n] |
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