BetaHarshith→Unable to login into codeforces.com — please help !! Boyinsace→every newbie problem.. MathModel→Invitation to Robocontest Round 103 (PI DAY !) not_OMR125→How to create a problem that i don't have a main solution for on polygon ...
Codeforces 446C 线段树 递推Fibonacci公式 聪哥推荐的题目 区间修改和区间查询,但是此题新颖之处就在于他的区间修改不是个定值,而是从L 到 R 分别加 F1、F2、。。。Fr-l+1 (F为斐波那契数列) 想了一下之后,觉得用fib的前缀和来解决,每次做懒惰标记记录下当前区间是从哪个L开始加起的,敲了一半之后发现有问...
用到了一些套路,比如用map标记大数,以及加上pair来标记一组数。 开始有往dp方向考虑,想先给数列排个序,然后依次往右找。但是两数相加不一定会变大,和可能会在左边,比如本题负数情况。 再一个每次寻找下一个值时,都要重新使用标记,为了防止后效性,使用递归来处理。 #include<stdio.h>#include<string.h>#incl...
(1)当n<=28的时候,可以直接kmp算。 (2)当n>28的时候,我们可以得到下面的递推式:(ans[i]表示f[i]里面有多少个s.可以先kmp求出ans[i](25 <= i <= 28) ). 先定义odd = ans[27] - ans[26] - ans[25](即得到s[27]由s[26]和s[25]拼接起来的时候能多得到的答案). even = ans[28] - ...
fn + 2 = fn + 1 + fnfor alln ≥ 0. You are given some sequence of integersa1, a2, ..., an. Your task is rearrange elements of this sequence in such a way that its longest possible prefix is Fibonacci-ish sequence. ...
Your task is to calculate the sum of costs of all subsequences of the stringF(x). Since answer may be large, calculate it modulo109 + 7. The first line contains two integersnandx(1 ≤ n ≤ 100,0 ≤ x ≤ 100) — the length ofsand the index of a Fibonacci...
Codeforces Blitz Cup 2025. Day 1 By KAN Stream is running View all → → Top rated #UserRating 1 tourist 3857 2 jiangly 3747 3 orzdevinwang 3706 4 jqdai0815 3682 5 ksun48 3591 6 gamegame 3477 7 Benq 3468 8 Radewoosh 3463 9 ecnerwala 3451 10 heuristica 3431 Countries | Cities ...
CodeForces - 633D Fibonacci-ish (map&暴力) Time Limit:3000MS Memory Limit:524288KB 64bit IO Format:%I64d & %I64u CodeForces - 633D Fibonacci-ish SubmitStatus Description Yash has recently learnt about the Fibonacci sequence and is very excited about it. He calls a sequence Fibonacci-ish if...
代码:Codeforces。 2. 通项 众所周知 f(n)=15(φ1n−φ2n),因此: ∑i=0k(ki)f(i+m)=φ1m5∑i=0k(ki)φ1i−φ2m5∑i=0k(ki)φ2i=φ1m5(φ1+1)k−φ2m5(φ2+1)k由于5 不存在 mod(109+7) 的二次剩余,所以用扩域来解决。同样是 O(n) 预处理幂,这个实现起来要比矩阵简单一...
CodeForces 217 B Blackboard Fibonacci (思维的暴力) B. Blackboard Fibonacci time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Fibonacci numbers are the sequence of integers:f0 = 0,f1 = 1,f2 = 1,f3 = 2,f4 =...