题目 2539:
信息学奥赛一本通T1643-Fibonacci 前 n 项和
时间限制: 2s
内存限制: 192MB 提交: 228 解决: 77
题目描述
大家都知道 Fibonacci 数列吧,f1=1,f2=1,f3=2,f4=3,…,fn=fn−1+fn−2 。
现在问题很简单,输入 n 和 m,求 {fn} 的前 n 项和 Sn mod m。
提示
数据范围与提示:
对于 100% 的数据, 1≤n≤2×109,1≤m≤109+10。
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