「CF757E」 Bash Plays with Functions 题意 设ω(n)ω(n) 表示nn 的质因子个数,定义 fr(n)={∑p⋅q=n[gcd(p,q)=1],r=0∑u⋅v=nfr−1(u)+fr−1(v)2,r≥1fr(n)=⎩⎨⎧p⋅q=n∑[gcd(p,q)=1],u⋅v=n∑2fr−1(u)+fr−1(v),r=0r≥1 给出qq 个r,...
using namespace std;constintMAXN=1e6+10,INF=1e9+10,mod=1e9+7;inline intread(){char c=getchar();int x=0,f=1;while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}while(c>='0'&&c<='9')x=x*10+c-'0',c=getchar();returnx*f;}int prime[MAXN],tot,vis[MAXN];L...
757E. Bash Plays with Functions 题意:定义函数 f0(n)=∑u∗v=n[gcd(u,v)=1]f0(n)=∑u∗v=n[gcd(u,v)=1] fr+1(n)=∑u∗v=nfr(u)+fr(v)2fr+1(n)=∑u∗v=nfr(u)+fr(v)2 给定qq 次询问,每次询问给出 r,nr,n,输出 fr(n)fr(n) 答案对 1e9+71e9+7 取模 解法:积...
757E. Bash Plays with Functions 题解 757E. Bash Plays with Functions 题意:定义函数 \[f_0(n) = \sum_{u * v =n} [gcd(u, v) = 1]\] \[f_{r + 1}(n) = \sum_{u*v = n} \frac{f_r(u) + f_r(v)}{2}\] 给定\(q\) 次询问,每次询问给出 \(r,n\),输...
CF 757 E Bash Plays with Functions —— 积性函数与质因数分解,题目:http://codeforces.com/contest/757/problem/E首先,f0(n)=2m,其中m是n的质因数的种类数;而且因为这个函数和1卷积,所以是一个积性函数,就可以每个质因子单独考虑;而f0(pq)=2,对于每个质因子都一
Adding any Comment in any program plays a vital role. It means the shell script will ignore that command or line. Example: #This is my first script Shell Variables Variables are those to store data in terms of characters and numbers. Similarly, shell variables store information a user provide...
First, we wrapped the variable containing the string with the curly brackets and preceded the # operator with the variable.The # operator plays an essential role in printing the length of the string. If # is not used, the code will print the whole string, so adding it to the variable is...
# Provide common setup and teardown functions, but do not name them such! # That way individual tests can override with their own setup/teardown, # while retaining the ability to include these if they so desire.# Setup helper: establish a test environment with exactly the images nee...
Bash shell scripting Shell scripting plays a large role in the normal functions of a Unix-like system. Shell scripts are used by many distributions to start system services at boot, and by a wide variety of software packages to perform maintenance and configuration tasks. Shell scripting ...
UBASH3BMetabolic reprogramming plays a pivotal role in tumorigenesis and development of lung adenocarcinoma (LUAD). However, the precise mechanisms and potential targets for metabolic reprogramming in LUAD remain elusive. Our prior investigations revealed that the mitochondrial ribosomal protein MRPL12, ...