Answers for "return the first k number of digits from number. if the number of digits in number is less than k, return number."

0

first k digits of n*n

factor = n mod 10^k
result = 1
while (n != 0) 
    if (n is odd) then result = (result * factor) mod 10^k
    factor = (factor * factor) mod 10^k
    n >>= 1
Posted by: Guest on August-21-2020

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