Maybe ACMers of HIT are always fond of fibonacci numbers, because it is so beautiful. Don't you think so? At the same time,fishcanfly always likes to change and this time he thinks about the following series of numbers which you can guess is derived
Problem Description: 瓜瓜在玩着由红色和蓝色的大理石做成的玻璃珠,他将n个玻璃珠从左到右排成一个序列叫做无聊者序列.一个非空的红色和蓝色玻璃珠组成的序列是一个无聊者序列.这个序列的玻璃珠颜色是交替的,例如:序列(红色:蓝色:红色)和(蓝色)是一个无聊者序列.(红色:红色)不是无聊者序列.现在,瓜瓜想知道,从这个序列中选出一个无聊者子序列有多少种方法.并将它mod(1000000007). Input: 输入有多组数据,输入一个整数n(1 <= n <= 10^6),代表这个
C. DZY Loves Fibonacci Numbers time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation F1 = 1; F2
5152. Brute-force Algorithm EXTREME Problem code: BFALG Please click here to download a PDF version of the contest problems. The problem is problem B in the PDF. But the data limits is slightly modified: 1≤P≤1000000 in the original description, but i