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
#include<bits/stdc++.h>usingnamespacestd;#definelsonl,m,rt<<1#definersonm+1,r,rt<<1|1#defineLLlonglong#definerep1(i,a,b)for(inti=a;i<=b;i++)#definerep2(i,a,b)for(inti=a;i>=b;i--)#definempmake_pair#definepbpush_back#definefifirst#definesesecond#definems(x,y)memset(x,...
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...
codeforces757E. Bash Plays with Functions(狄利克雷卷积 积性函数),http://codeforces.com/contest/757/problem/E题意Sol非常骚的一道题首先把给的式子化一下,设$u=d$,那么$v=n/d$$$f_r(n)=\sum_{d\midn}\frac{f_{r-1}(d)+f_{r-1}
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