UVA10820 Send a Table

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UVa10820 Send a Table[欧拉函数]

Send a TableInput: Standard Input Output: Standard Output When participating in programming contests, you sometimes face the following problem: You know how to calcutale the output for the given input values, but your algorithm is way too slow to eve…

uva10820 send a table (nlogn求1-n欧拉函数值模版

//重点就是求1-n的欧拉函数啦,重点是nlogn求法的版 //大概过程类似于筛选法求素数 #include<cstdio> #include<iostream> #include<cmath> #include<algorithm> #include<cstring> #include<cstdlib> #include<queue> #include<vector> #include<map>…

嘟嘟嘟 [欧拉函数] 大致题意:如果知道f(a, b),就可以求出f(a * k, b * k).现给出一个n,求至少需要知道几个二元组(a, b),使所有的f(x, y)都能求出来.(1 <= x, y <= n) 首先能确定的是gcd(a, b) = 1.不妨假设b >= a,那么如果b一定,至少需要phi(b)个a,才能知道所有的f(a * k, b * k).令dp[n]表示这种情况下的答案,则dp[n] = ∑phi[i] (1 <= i <= n). 上述是在a…

UVA 10820 - Send a Table 数论（欧拉函数）

Send a Table Input: Standard Input Output: Standard Output When participating in programming contests, you sometimes face the following problem: You know how to calcutale the output for the given input values, but your algorithm is way too slow to ev…

UVA 10820 Send a Table euler_phi功能

除1,1其他外国x,y不等于为 x<y 案件一切y有phi(y)组合 F[x]= phi(i) 2<=i<=x 结果为 2*F[x]+1 Problem A Send a Table Input: Standard Input Output: Standard Output When participating in programming contests, you sometimes face the following problem: You know how to calc…

UVA10820 交表 Send a Table

\(\Large\textbf{Description:} \large{输入n,求有多少个二元组(x,y)满足:1\leqslant x,y\leqslant n,且x和y互素.}\) \(\Large\textbf{Solution:} \large{不难发现除了(1,1)外,其他二元组的x,y都不相等.设满足x < y的二元组有g(n)个,那么答案为2\times g(n) + 1.}\) \(\large{其中g(n)=\sum_{i=2}^n\Phi(i)}.\) \(\Large\t…

【UVA 10820】Send a Table（欧拉函数）

Description When participating in programming contests, you sometimes face the following problem: You know how to calcutale the output for the given input values, but your algorithm is way too slow to ever pass the time limit. However hard you try, y…