HackerRank# Fibonacci Modified

原题地址

竟然64位都要爆，这是要大整数乘法的节奏吗？我才不要写大整数乘法呢，用Ruby干掉

代码：

 # Enter your code here. Read input from STDIN. Print output to STDOUT
 num = [0, 0]
 num[0], num[1], n = readline.chomp.split(' ').map {|e| e.to_i}
 (n - 2).times do
     tmp = num[1] ** 2 + num[0]
     num[0] = num[1]
     num[1] = tmp
 end
 puts num[1]