6 BULLET CURVE

If N is the number of people in circle and if K is the nearest power of 2 which is less than N, then

Last Person = 2 * (N - K) + 1

#Import math Library

import math

#N People

N = 100

#Largest Power of 2 <= Total Number

M = math.log(N,2);

#If Largest Power of 2 = Total Number

if(M.is_integer()):

​ print('1');

#Else Largest Power of 2 < Total Number

else:

​ P = math.floor(M);

​ K = pow(2,P)

​ Sol = 2 * (N - K) + 1

​ print('Surviving Person:', Sol) 

If N = 100 then output:

Surviving Person: 73

If N = 5 then output:

Surviving Person: 3